diff --git a/app/components/Dialog/Confirm.vue b/app/components/Dialog/Confirm.vue
new file mode 100644
index 0000000..f4aeae8
--- /dev/null
+++ b/app/components/Dialog/Confirm.vue
@@ -0,0 +1,34 @@
+<script setup lang="ts">
+defineProps<{
+    title?: string;
+    message?: string;
+    confirmLabel?: string;
+    danger?: boolean;
+}>();
+
+const emit = defineEmits(['confirm', 'cancel']);
+</script>
+
+<template>
+    <div class="flex flex-col gap-4.5 p-6 w-screen md:w-110 max-w-full h-full md:h-auto" role="alertdialog"
+        aria-labelledby="confirm-title" aria-describedby="confirm-message">
+        <h2 id="confirm-title" class="text-lg font-semibold">{{ title ?? 'Are you sure?' }}</h2>
+
+        <p v-if="message" id="confirm-message" class="text-sm leading-normal text-[var(--text-secondary)]">
+            {{ message }}
+        </p>
+
+        <footer class="flex justify-between gap-2 mt-auto">
+            <button type="button"
+                class="flex items-center h-10 px-4 rounded-md border border-[var(--color-border)] text-[var(--text-secondary)] @hover:bg-[var(--color-hover)] transition-[background-color] duration-200"
+                @click="emit('cancel')">
+                Cancel
+            </button>
+            <button type="button" class="flex items-center h-10 px-4 rounded-md font-semibold"
+                :class="danger ? 'bg-red-600 text-white' : 'bg-[var(--color-accent)] text-[var(--color-accent-text)]'"
+                @click="emit('confirm', true)">
+                {{ confirmLabel ?? 'Confirm' }}
+            </button>
+        </footer>
+    </div>
+</template>
diff --git a/app/components/Dialog/CreateUser.vue b/app/components/Dialog/CreateUser.vue
new file mode 100644
index 0000000..61014cc
--- /dev/null
+++ b/app/components/Dialog/CreateUser.vue
@@ -0,0 +1,155 @@
+<script setup lang="ts">
+const MIN_PASSWORD_LENGTH = 8;
+const GENERATED_PASSWORD_LENGTH = 16;
+// no look-alikes (0/O, 1/l/I), this gets read out or typed by hand
+const PASSWORD_ALPHABET = 'abcdefghijkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ23456789';
+
+const emit = defineEmits(['confirm', 'cancel']);
+
+const { client: authClient } = useAuth();
+
+const form = reactive({
+    name: '',
+    email: '',
+    password: '',
+});
+
+const busy = ref(false);
+const error = ref('');
+
+const nameInputEl = ref<HTMLInputElement | null>(null);
+
+onMounted(() => {
+    nameInputEl.value?.focus();
+});
+
+const ready = computed(() =>
+    form.name.trim() !== '' && form.email.trim() !== '' && form.password.length >= MIN_PASSWORD_LENGTH);
+
+const generatePassword = () => {
+    // values past the last full run of the alphabet are skipped, so every
+    // character stays equally likely
+    const limit = 256 - (256 % PASSWORD_ALPHABET.length);
+    let password = '';
+
+    while (password.length < GENERATED_PASSWORD_LENGTH) {
+        for (const value of crypto.getRandomValues(new Uint8Array(GENERATED_PASSWORD_LENGTH))) {
+            if (value >= limit || password.length === GENERATED_PASSWORD_LENGTH) continue;
+
+            password += PASSWORD_ALPHABET[value % PASSWORD_ALPHABET.length];
+        }
+    }
+
+    form.password = password;
+};
+
+const submit = async () => {
+    if (busy.value || !ready.value) return;
+
+    busy.value = true;
+    error.value = '';
+
+    const { error: createError } = await authClient.admin.createUser({
+        name: form.name.trim(),
+        email: form.email.trim(),
+        password: form.password,
+        role: 'user',
+    });
+
+    busy.value = false;
+
+    if (createError) {
+        switch (createError.code) {
+            case 'USER_ALREADY_EXISTS':
+            case 'USER_ALREADY_EXISTS_USE_ANOTHER_EMAIL':
+                error.value = 'An account with this email already exists.';
+                break;
+            case 'INVALID_EMAIL':
+                error.value = 'That email address is not valid.';
+                break;
+            case 'PASSWORD_TOO_SHORT':
+                error.value = `The password needs at least ${MIN_PASSWORD_LENGTH} characters.`;
+                break;
+            case 'PASSWORD_TOO_LONG':
+                error.value = 'That password is too long.';
+                break;
+            default:
+                console.error('Failed to create user:', createError);
+                error.value = 'The account could not be created. Try again.';
+                break;
+        }
+
+        return;
+    }
+
+    emit('confirm', true);
+};
+</script>
+
+<template>
+    <form class="flex flex-col gap-4.5 p-6 w-screen md:w-130 max-w-full h-full md:h-auto overflow-y-auto"
+        aria-labelledby="create-user-title" @submit.prevent="submit">
+        <header class="flex flex-col gap-1">
+            <h2 id="create-user-title" class="text-lg font-semibold">Create user</h2>
+            <p class="text-sm text-[var(--text-secondary)]">
+                Creates the account right away. Nothing is sent to them, so pass the password on yourself.
+            </p>
+        </header>
+
+        <div class="flex flex-col gap-1.5">
+            <label for="create-user-name"
+                class="text-[13px] font-medium uppercase tracking-wider text-[var(--text-secondary)]">
+                Name
+            </label>
+            <input id="create-user-name" ref="nameInputEl" v-model="form.name" type="text" required maxlength="128"
+                :disabled="busy" autocomplete="off"
+                class="w-full h-9 px-2.5 text-sm rounded-md bg-[var(--bg-container)]" />
+        </div>
+
+        <div class="flex flex-col gap-1.5">
+            <label for="create-user-email"
+                class="text-[13px] font-medium uppercase tracking-wider text-[var(--text-secondary)]">
+                Email
+            </label>
+            <input id="create-user-email" v-model="form.email" type="email" required :disabled="busy"
+                autocomplete="off" class="w-full h-9 px-2.5 text-sm rounded-md bg-[var(--bg-container)]" />
+        </div>
+
+        <div class="flex flex-col gap-1.5">
+            <label for="create-user-password"
+                class="text-[13px] font-medium uppercase tracking-wider text-[var(--text-secondary)]">
+                Temporary password
+            </label>
+            <div class="flex gap-2">
+                <!-- shown in the clear, the admin has to read it to pass it on -->
+                <input id="create-user-password" v-model="form.password" type="text" required
+                    :minlength="MIN_PASSWORD_LENGTH" maxlength="128" :disabled="busy" autocomplete="off"
+                    autocapitalize="off" spellcheck="false"
+                    class="flex-1 min-w-0 h-9 px-2.5 text-sm font-mono rounded-md bg-[var(--bg-container)]" />
+                <button type="button" :disabled="busy" @click="generatePassword"
+                    class="flex items-center h-9 px-3 text-sm rounded-md border border-[var(--color-border)] text-[var(--text-secondary)] @hover:bg-[var(--color-hover)] disabled:opacity-50 disabled:cursor-not-allowed transition-[background-color] duration-200">
+                    Generate
+                </button>
+            </div>
+            <p class="text-xs leading-normal text-[var(--text-secondary)]">
+                At least {{ MIN_PASSWORD_LENGTH }} characters. They can change it under Settings → Security
+                after signing in.
+            </p>
+        </div>
+
+        <p v-if="error" role="alert" class="text-sm text-red-400">{{ error }}</p>
+
+        <footer class="flex justify-between gap-2 mt-auto">
+            <button type="button" :disabled="busy"
+                class="flex items-center h-10 px-4 rounded-md border border-[var(--color-border)] text-[var(--text-secondary)] @hover:bg-[var(--color-hover)] disabled:opacity-50 disabled:cursor-not-allowed transition-[background-color] duration-200"
+                @click="emit('cancel')">
+                Cancel
+            </button>
+            <button type="submit" :disabled="busy || !ready"
+                class="flex items-center gap-2 h-10 px-4 rounded-md font-semibold bg-[var(--color-accent)] text-[var(--color-accent-text)] disabled:opacity-40 disabled:cursor-not-allowed">
+                <span v-if="busy" class="i-svg-spinners-180-ring-with-bg text-4"></span>
+                Create user
+            </button>
+        </footer>
+    </form>
+</template>
diff --git a/app/components/Dialog/index.vue b/app/components/Dialog/index.vue
index 47f859a..f7bbdf9 100644
--- a/app/components/Dialog/index.vue
+++ b/app/components/Dialog/index.vue
@@ -4,6 +4,8 @@ import QuickSwitcher from './QuickSwitcher.vue';
 import ChangePassword from './ChangePassword.vue';
 import TwoFactor from './TwoFactor.vue';
 import DeleteAccount from './DeleteAccount.vue';
+import Confirm from './Confirm.vue';
+import CreateUser from './CreateUser.vue';
 
 import { DialogType } from '~/composables/useDialog';
 
@@ -69,6 +71,8 @@ onUnmounted(() => {
                 <TwoFactor v-else-if="page === DialogType.TwoFactor" :action="data.action" @confirm="confirm"
                     @cancel="close" />
                 <DeleteAccount v-else-if="page === DialogType.DeleteAccount" @confirm="confirm" @cancel="close" />
+                <CreateUser v-else-if="page === DialogType.CreateUser" @confirm="confirm" @cancel="close" />
+                <Confirm v-else-if="page === DialogType.Confirm" v-bind="data" @confirm="confirm" @cancel="close" />
             </div>
         </div>
     </Transition>
diff --git a/app/components/Sidenav/NavSettings.vue b/app/components/Sidenav/NavSettings.vue
index f1a55d8..e50232c 100644
--- a/app/components/Sidenav/NavSettings.vue
+++ b/app/components/Sidenav/NavSettings.vue
@@ -3,10 +3,21 @@ import { providerIcons } from '~/utils/model-mapping';
 
 const route = useRoute();
 const { providers } = await useModels();
+const { isAdmin } = useAuth();
 
-const groups = [
+const ADMIN_GROUP = {
+    label: 'Instance',
+    adminOnly: true,
+    items: [
+        { to: '/settings/instance/users', name: 'Users', icon: 'i-mynaui-users' },
+        { to: '/settings/instance', name: 'Instance', icon: 'i-tabler-server' },
+    ],
+};
+
+const BASE_GROUPS = [
     {
         label: 'Account',
+        adminOnly: false,
         items: [
             { to: '/settings/profile', name: 'Profile', icon: 'i-mynaui-user' },
             { to: '/settings/security', name: 'Security', icon: 'i-mynaui-shield' },
@@ -14,6 +25,7 @@ const groups = [
     },
     {
         label: 'App',
+        adminOnly: false,
         items: [
             { to: '/settings/general', name: 'General', icon: 'i-mynaui-cog-four' },
             { to: '/settings/appearance', name: 'Appearance', icon: 'i-tabler-palette' },
@@ -23,6 +35,8 @@ const groups = [
     },
 ];
 
+const groups = computed(() => isAdmin.value ? [...BASE_GROUPS, ADMIN_GROUP] : BASE_GROUPS);
+
 const inProviders = computed(() => route.path.startsWith('/settings/providers'));
 
 // enabled providers first, same order the provider list uses
@@ -35,8 +49,13 @@ const sortedProviders = computed(() => [
 <template>
     <nav aria-label="Settings" class="flex flex-col gap-1 overflow-auto">
         <template v-for="group in groups" :key="group.label">
-            <div class="px-2 pt-3 pb-0.5 text-sm md:text-xs font-medium uppercase tracking-wider">
+            <div
+                class="flex items-center justify-between px-2 pt-3 pb-0.5 text-sm md:text-xs font-medium uppercase tracking-wider">
                 {{ group.label }}
+                <span v-if="group.adminOnly"
+                    class="px-1.5 py-0.25 rounded border border-[var(--color-border-active)] text-[10px] tracking-wide">
+                    Admin only
+                </span>
             </div>
 
             <template v-for="item in group.items" :key="item.to">
diff --git a/app/composables/useAuth.ts b/app/composables/useAuth.ts
index 798c412..820f11f 100644
--- a/app/composables/useAuth.ts
+++ b/app/composables/useAuth.ts
@@ -1,5 +1,5 @@
 import type { BetterAuthClientOptions, InferSessionFromClient, InferUserFromClient, User } from 'better-auth/client';
-import { twoFactorClient } from 'better-auth/client/plugins';
+import { adminClient, twoFactorClient } from 'better-auth/client/plugins';
 import { createAuthClient } from 'better-auth/vue';
 import { Err, Ok, type Result } from '~~/types/result';
 import { assert } from '~~/utils/assert';
@@ -31,7 +31,7 @@ export type SignInResult =
 
 export const useAuth = () => {
     const authClient = createAuthClient({
-        plugins: [twoFactorClient()],
+        plugins: [twoFactorClient(), adminClient()],
     });
     const session = useState<InferSessionFromClient<BetterAuthClientOptions> | null>('auth:session', () => null);
     const user = useState<AuthUser | null>('auth:user', () => null);
diff --git a/app/composables/useDialog.ts b/app/composables/useDialog.ts
index c83ca94..bc1eb8d 100644
--- a/app/composables/useDialog.ts
+++ b/app/composables/useDialog.ts
@@ -7,6 +7,7 @@ export enum DialogType {
     ChangePassword = 'change-password',
     TwoFactor = 'two-factor',
     DeleteAccount = 'delete-account',
+    CreateUser = 'create-user',
 }
 
 interface DialogOptions {
diff --git a/app/middleware/auth.global.ts b/app/middleware/auth.global.ts
index 98f4129..0d2792b 100644
--- a/app/middleware/auth.global.ts
+++ b/app/middleware/auth.global.ts
@@ -31,7 +31,7 @@ export default defineNuxtRouteMiddleware(async (to) => {
         // once an account exists the answer never changes back
         if (setupNeeded.value !== false) {
             try {
-                setupNeeded.value = (await $fetch<{ needed: boolean }>('/api/setup')).needed;
+                setupNeeded.value = (await $fetch<{ setupNeeded: boolean }>('/api/instance')).setupNeeded;
             } catch (error) {
                 console.error('Failed to check instance setup:', error);
                 setupNeeded.value = null;
diff --git a/app/pages/auth/login.vue b/app/pages/auth/login.vue
index ac21334..ea41cc0 100644
--- a/app/pages/auth/login.vue
+++ b/app/pages/auth/login.vue
@@ -14,7 +14,8 @@ if (session.value !== null) {
     await navigateTo(to ?? '/');
 }
 
-const config = useRuntimeConfig();
+// who may register is an instance setting, admins change it while it runs
+const { data: instance } = await useFetch('/api/instance', { key: 'instance' });
 
 const form = reactive({
     email: '',
@@ -110,6 +111,10 @@ const submit = async () => {
                 emailInputEl.value!.setCustomValidity(res.error.data.message!);
                 emailInputEl.value!.reportValidity();
                 break;
+            case 'BANNED_USER':
+                emailInputEl.value!.setCustomValidity('This account has been disabled by an admin of this instance.');
+                emailInputEl.value!.reportValidity();
+                break;
             default:
                 console.log(res.error);
                 alert(`Something went wrong. ${res.error.data.message}`);
@@ -303,7 +308,7 @@ const submitTwoFactor = async () => {
                 </form>
             </div>
 
-            <p v-if="!config.public.disableSignup && step === 'credentials'" class="text-sm text-center mt-3 text-[var(--text-secondary)]">
+            <p v-if="instance?.registration === 'open' && step === 'credentials'" class="text-sm text-center mt-3 text-[var(--text-secondary)]">
                 New to Veridian?
                 <NuxtLink :to="to ? `/auth/register?to=${to}` : '/auth/register'"
                     class="text-[var(--color-accent)] font-medium @hover:underline">
diff --git a/app/pages/auth/register.vue b/app/pages/auth/register.vue
index 003b911..fdb4eff 100644
--- a/app/pages/auth/register.vue
+++ b/app/pages/auth/register.vue
@@ -12,9 +12,10 @@ if (session.value !== null) {
     await navigateTo(to ?? '/');
 }
 
-const config = useRuntimeConfig();
+// who may register is an instance setting, admins change it while it runs
+const { data: instance } = await useFetch('/api/instance', { key: 'instance' });
 
-if (config.public.disableSignup) {
+if (instance.value && instance.value.registration !== 'open') {
     await navigateTo(to ? `/auth/login?to=${to}` : '/auth/login');
 }
 
@@ -121,6 +122,10 @@ const submit = async () => {
                 passwordInputEl.value!.setCustomValidity(res.error.data.message!);
                 passwordInputEl.value!.reportValidity();
                 break;
+            case 'REGISTRATION_CLOSED':
+                // an admin closed registration while this page was open
+                alert('Registration is closed on this instance. Ask an admin for an account.');
+                break;
             default:
                 console.log(res.error);
                 alert('Something went wrong: ' + res.error.data.message);
diff --git a/app/pages/settings.vue b/app/pages/settings.vue
index 378714d..7c96034 100644
--- a/app/pages/settings.vue
+++ b/app/pages/settings.vue
@@ -10,6 +10,7 @@ const TITLES: Record<string, string> = {
     appearance: 'Appearance',
     providers: 'AI Providers',
     assistants: 'System Assistants',
+    instance: 'Instance',
 };
 
 const title = computed(() => {
@@ -20,6 +21,8 @@ const title = computed(() => {
         return provider ? provider.name : 'Unknown Provider';
     }
 
+    if (section === 'instance' && id === 'users') return 'Users';
+
     return TITLES[section ?? ''] ?? 'Settings';
 });
 </script>
diff --git a/app/pages/settings/instance/index.vue b/app/pages/settings/instance/index.vue
new file mode 100644
index 0000000..3ae98bd
--- /dev/null
+++ b/app/pages/settings/instance/index.vue
@@ -0,0 +1,104 @@
+<script setup lang="ts">
+import type { RegistrationMode } from '~~/drizzle/schema';
+
+type InstanceSettings = {
+    registration: RegistrationMode;
+    registrationLocked: boolean;
+};
+
+const REGISTRATION_OPTIONS: { value: RegistrationMode; label: string; description: string }[] = [
+    {
+        value: 'open',
+        label: 'Open',
+        description: 'Anyone who can reach this instance can create an account.',
+    },
+    {
+        value: 'invite',
+        label: 'Invite only',
+        description: 'New accounts need an invite link from an admin. Invite links are not available yet, so until then nobody can register.',
+    },
+    {
+        value: 'closed',
+        label: 'Closed',
+        description: 'Nobody can register. Admins create accounts under Users.',
+    },
+];
+
+const { isAdmin } = useAuth();
+
+if (!isAdmin.value) {
+    await navigateTo('/settings/profile');
+}
+
+const { data: instance } = await useFetch<InstanceSettings>('/api/admin/instance', {
+    key: 'admin_instance',
+});
+
+const saving = ref(false);
+const error = ref('');
+
+const locked = computed(() => !!instance.value?.registrationLocked);
+const current = computed(() => REGISTRATION_OPTIONS.find(o => o.value === instance.value?.registration));
+
+const setRegistration = async (registration: RegistrationMode) => {
+    if (saving.value || locked.value || !instance.value || instance.value.registration === registration) return;
+
+    saving.value = true;
+    error.value = '';
+
+    try {
+        instance.value = await $fetch<InstanceSettings>('/api/admin/instance', {
+            method: 'PUT',
+            body: { registration },
+        });
+        // the sign in pages read this to decide whether to offer registering
+        clearNuxtData('instance');
+    } catch (err) {
+        console.error('Failed to change registration:', err);
+        error.value = 'Registration could not be changed. Try again.';
+    }
+
+    saving.value = false;
+};
+</script>
+
+<template>
+    <div
+        class="flex flex-col py-4 overflow-auto [scrollbar-width:thin] [scrollbar-color:#888_transparent] [scrollbar-gutter:stable]">
+        <div class="flex flex-col gap-7 w-full max-w-3xl">
+            <section class="flex flex-col gap-3">
+                <div class="flex flex-wrap items-center justify-between gap-3">
+                    <div class="flex flex-col gap-0.5 flex-1 min-w-70">
+                        <h2 class="font-medium">Registration</h2>
+                        <p class="text-[13px] text-[var(--text-secondary)]">
+                            {{ current?.description ?? 'The instance settings could not be loaded.' }}
+                        </p>
+                    </div>
+
+                    <div role="group" aria-label="Registration mode"
+                        class="flex gap-0.5 p-0.5 rounded-lg bg-[var(--bg-container)]">
+                        <button v-for="option in REGISTRATION_OPTIONS" :key="option.value" type="button"
+                            :aria-pressed="instance?.registration === option.value"
+                            :disabled="saving || locked || !instance" @click="setRegistration(option.value)"
+                            class="flex items-center h-7.5 px-3 text-sm rounded-md disabled:cursor-not-allowed transition-colors duration-200"
+                            :class="instance?.registration === option.value
+                                ? 'bg-[var(--color-accent)] text-[var(--color-accent-text)] font-medium'
+                                : 'text-[var(--text-secondary)] enabled:@hover:bg-[var(--color-hover)]'">
+                            {{ option.label }}
+                        </button>
+                    </div>
+                </div>
+
+                <p v-if="locked" class="flex gap-2 text-[13px] leading-normal text-[var(--text-secondary)]">
+                    <span class="i-mynaui-lock text-4 mt-0.5 flex-shrink-0" aria-hidden="true"></span>
+                    <span>
+                        Registration is turned off by the <code class="font-mono text-xs">DISABLE_SIGNUP</code>
+                        environment variable. Remove it and restart the server to change this here.
+                    </span>
+                </p>
+
+                <p v-if="error" role="alert" class="text-sm text-red-400">{{ error }}</p>
+            </section>
+        </div>
+    </div>
+</template>
diff --git a/app/pages/settings/instance/users.vue b/app/pages/settings/instance/users.vue
new file mode 100644
index 0000000..fb40981
--- /dev/null
+++ b/app/pages/settings/instance/users.vue
@@ -0,0 +1,348 @@
+<script setup lang="ts">
+import { DialogType } from '~/composables/useDialog';
+
+type UserRow = {
+    id: string;
+    name: string;
+    email: string;
+    image: string | null;
+    role: 'admin' | 'user';
+    banned: boolean;
+    twoFactorEnabled: boolean;
+    createdAt: string;
+    lastActiveAt: string | null;
+};
+
+type Filter = 'all' | 'admins' | 'disabled';
+
+const GRID_CLASS = 'grid grid-cols-[minmax(230px,2fr)_90px_100px_60px_150px_110px_36px] items-center gap-3 px-3';
+const MENU_ITEM_CLASS = 'flex items-center gap-2 h-8.5 px-2.5 text-sm text-left rounded-lg @hover:bg-[var(--color-hover)] transition-colors duration-150';
+
+// same tinted pill as the role badge on the profile page
+const ACCENT_PILL_STYLE = {
+    backgroundColor: 'color-mix(in srgb, var(--color-accent) 20%, transparent)',
+    borderColor: 'color-mix(in srgb, var(--color-accent) 50%, transparent)',
+};
+
+const { client: authClient, user: me, isAdmin } = useAuth();
+const { openDialog } = useDialog();
+
+if (!isAdmin.value) {
+    await navigateTo('/settings/profile');
+}
+
+const { data: userData, error: loadError, refresh: loadUsers } = await useFetch<UserRow[]>('/api/admin/users', {
+    key: 'admin_users',
+});
+
+const users = computed(() => userData.value ?? []);
+
+const search = ref('');
+const filter = ref<Filter>('all');
+
+const filters = computed<{ value: Filter; label: string; count: number }[]>(() => [
+    { value: 'all', label: 'All', count: users.value.length },
+    { value: 'admins', label: 'Admins', count: users.value.filter(u => u.role === 'admin').length },
+    { value: 'disabled', label: 'Disabled', count: users.value.filter(u => u.banned).length },
+]);
+
+const visibleUsers = computed(() => {
+    const query = search.value.trim().toLowerCase();
+
+    return users.value.filter((u) => {
+        if (filter.value === 'admins' && u.role !== 'admin') return false;
+        if (filter.value === 'disabled' && !u.banned) return false;
+
+        return query === '' || u.name.toLowerCase().includes(query) || u.email.toLowerCase().includes(query);
+    });
+});
+
+// fixed locale and time zone so the server and client render the same text
+const formatDate = (date: string | Date) => new Date(date).toLocaleDateString('en-US', {
+    year: 'numeric',
+    month: 'short',
+    day: 'numeric',
+    timeZone: 'UTC',
+});
+
+// The server does not know the viewer's time zone, so it renders the date only
+// and the time of day is filled in once the page is running in the browser.
+const mounted = ref(false);
+onMounted(() => {
+    mounted.value = true;
+});
+
+const formatDateTime = (date: string | Date) => {
+    if (!mounted.value) return formatDate(date);
+
+    return new Date(date).toLocaleString('en-US', {
+        month: 'short',
+        day: 'numeric',
+        hour: 'numeric',
+        minute: '2-digit',
+    });
+};
+
+// ---------------------------------------------------------------------------
+// Actions
+// ---------------------------------------------------------------------------
+
+const busyId = ref<string | null>(null);
+const actionError = ref('');
+
+// Runs one action on a user and reloads the list. The action returns false
+// when it did not go through.
+const run = async (user: UserRow, failure: string, action: () => Promise<boolean>) => {
+    if (busyId.value !== null) return;
+
+    busyId.value = user.id;
+    actionError.value = '';
+
+    let ok = false;
+    try {
+        ok = await action();
+    } catch (error) {
+        console.error(failure, error);
+    }
+
+    if (!ok) actionError.value = failure;
+
+    await loadUsers();
+    busyId.value = null;
+};
+
+const confirmThen = (options: { title: string; message: string; confirmLabel: string; danger?: boolean }, action: () => void) => {
+    openDialog(DialogType.Confirm, (result) => {
+        if (result.ok === false) return;
+
+        action();
+    }, options);
+};
+
+const setRole = (user: UserRow, role: 'admin' | 'user') => {
+    const change = () => run(user, `${user.name}'s role could not be changed.`, async () => {
+        const { error } = await authClient.admin.setRole({ userId: user.id, role });
+        return !error;
+    });
+
+    if (role === 'user') return change();
+
+    confirmThen({
+        title: `Make ${user.name} an admin?`,
+        message: 'Admins can create, disable and delete accounts, change roles and change who can register. They never see anyone else\'s chats, files or API keys.',
+        confirmLabel: 'Make admin',
+    }, change);
+};
+
+const signOutEverywhere = (user: UserRow) => run(user, `${user.name} could not be signed out.`, async () => {
+    const { error } = await authClient.admin.revokeUserSessions({ userId: user.id });
+    return !error;
+});
+
+const resetTwoFactor = (user: UserRow) => confirmThen({
+    title: `Reset two-factor for ${user.name}?`,
+    message: 'Turns two-factor sign-in off for this account and throws away its backup codes. They sign in with only their password until they set it up again.',
+    confirmLabel: 'Reset two-factor',
+}, () => run(user, `Two-factor could not be reset for ${user.name}.`, async () => {
+    await $fetch(`/api/admin/users/${user.id}/two-factor`, { method: 'DELETE' });
+    return true;
+}));
+
+const setDisabled = (user: UserRow, disabled: boolean) => {
+    const failure = `${user.name}'s account could not be ${disabled ? 'disabled' : 'enabled'}.`;
+
+    if (!disabled) {
+        return run(user, failure, async () => {
+            const { error } = await authClient.admin.unbanUser({ userId: user.id });
+            return !error;
+        });
+    }
+
+    confirmThen({
+        title: `Disable ${user.name}'s account?`,
+        message: 'They are signed out and can\'t sign in until the account is enabled again. Nothing is deleted.',
+        confirmLabel: 'Disable account',
+    }, () => run(user, failure, async () => {
+        const { error } = await authClient.admin.banUser({ userId: user.id });
+        return !error;
+    }));
+};
+
+const deleteUser = (user: UserRow) => confirmThen({
+    title: `Delete ${user.name}'s account?`,
+    message: `This permanently deletes ${user.email} with their agents, topics, messages, providers, saved API keys and file list. It can't be undone.`,
+    confirmLabel: 'Delete account',
+    danger: true,
+}, () => run(user, `${user.name}'s account could not be deleted.`, async () => {
+    await $fetch(`/api/admin/users/${user.id}`, { method: 'DELETE' });
+    return true;
+}));
+
+const openCreateUser = () => {
+    openDialog(DialogType.CreateUser, async (result) => {
+        if (result.ok === false) return;
+
+        await loadUsers();
+    });
+};
+</script>
+
+<template>
+    <div
+        class="flex flex-col pb-4 overflow-auto [scrollbar-width:thin] [scrollbar-color:#888_transparent] [scrollbar-gutter:stable]">
+        <div class="flex flex-wrap items-center justify-between gap-3 py-3">
+            <div class="flex flex-wrap items-center gap-2">
+                <label class="flex items-center gap-1.5 h-8 px-2 rounded-md bg-[var(--bg-container)]">
+                    <span class="i-mynaui-search text-4 text-[var(--text-secondary)]" aria-hidden="true"></span>
+                    <input v-model="search" type="search" aria-label="Search users" placeholder="Search users..."
+                        class="w-45 bg-transparent text-[13px] outline-none placeholder:text-[var(--text-tertiary)]" />
+                </label>
+
+                <button v-for="f in filters" :key="f.value" type="button" :aria-pressed="filter === f.value"
+                    @click="filter = f.value"
+                    class="flex items-center gap-1.5 h-8 px-2.5 text-[13px] rounded-md transition-colors duration-200"
+                    :class="filter === f.value
+                        ? 'bg-[var(--color-hover)] text-[var(--text-primary)]'
+                        : 'text-[var(--text-secondary)] @hover:bg-[var(--color-hover)]'">
+                    {{ f.label }} <span class="text-[var(--text-secondary)]">{{ f.count }}</span>
+                </button>
+            </div>
+
+            <button type="button" @click="openCreateUser"
+                class="flex items-center h-8 px-3 text-[13px] rounded-md border border-[var(--color-border)] @hover:bg-[var(--color-hover)] transition-colors duration-200">
+                Create user
+            </button>
+        </div>
+
+        <p v-if="loadError" role="alert" class="pb-3 text-sm text-red-400">The users could not be loaded.</p>
+        <p v-if="actionError" role="alert" class="pb-3 text-sm text-red-400">{{ actionError }}</p>
+
+        <div class="overflow-x-auto rounded-lg border border-[var(--color-border)]">
+            <div role="table" aria-label="Registered users" class="min-w-215">
+                <div role="row" :class="GRID_CLASS"
+                    class="h-9 bg-[var(--bg-container)] text-xs font-semibold uppercase tracking-wide text-[var(--text-secondary)]">
+                    <span role="columnheader">User</span>
+                    <span role="columnheader">Role</span>
+                    <span role="columnheader">Status</span>
+                    <span role="columnheader">2FA</span>
+                    <span role="columnheader">Last active</span>
+                    <span role="columnheader">Joined</span>
+                    <span role="columnheader" aria-label="Actions"></span>
+                </div>
+
+                <div v-for="u in visibleUsers" :key="u.id" role="row" :class="GRID_CLASS"
+                    class="h-14 border-t border-[var(--color-border)] text-sm">
+                    <div role="cell" class="flex items-center gap-2.5 min-w-0" :class="u.banned ? 'opacity-60' : ''">
+                        <UserAvatar :user="u" class="w-8 h-8 rounded-lg text-sm"></UserAvatar>
+                        <span class="flex flex-col min-w-0">
+                            <span class="font-medium whitespace-nowrap overflow-hidden text-ellipsis">
+                                {{ u.name }}
+                                <span v-if="u.id === me?.id" class="font-normal text-[var(--text-secondary)]">(you)</span>
+                            </span>
+                            <span class="text-xs text-[var(--text-secondary)] whitespace-nowrap overflow-hidden text-ellipsis">
+                                {{ u.email }}
+                            </span>
+                        </span>
+                    </div>
+
+                    <span role="cell">
+                        <span v-if="u.role === 'admin'"
+                            class="text-xs font-medium px-2 py-0.5 rounded-md border text-[var(--text-primary)]"
+                            :style="ACCENT_PILL_STYLE">Admin</span>
+                        <span v-else
+                            class="text-xs font-medium px-2 py-0.5 rounded-md border border-[var(--color-border-active)] text-[var(--text-secondary)]">User</span>
+                    </span>
+
+                    <span role="cell" class="flex items-center gap-1.5 text-[13px]"
+                        :class="u.banned ? 'text-red-400' : 'text-green-400'">
+                        <span aria-hidden="true" class="w-1.75 h-1.75 rounded-full bg-current"></span>
+                        {{ u.banned ? 'Disabled' : 'Active' }}
+                    </span>
+
+                    <span role="cell" class="text-[13px]"
+                        :class="u.twoFactorEnabled ? 'text-[var(--text-primary)]' : 'text-[var(--text-secondary)]'">
+                        {{ u.twoFactorEnabled ? 'On' : 'Off' }}
+                    </span>
+
+                    <span role="cell" class="text-[13px] text-[var(--text-secondary)]">
+                        {{ u.lastActiveAt ? formatDateTime(u.lastActiveAt) : 'Never' }}
+                    </span>
+
+                    <span role="cell" class="text-[13px] text-[var(--text-secondary)]">
+                        {{ formatDate(u.createdAt) }}
+                    </span>
+
+                    <span role="cell">
+                        <span v-if="busyId === u.id" class="flex items-center justify-center w-7.5 h-7.5">
+                            <span class="i-svg-spinners-180-ring-with-bg text-4 text-[var(--text-secondary)]"></span>
+                        </span>
+
+                        <!-- your own account is managed from Profile and Security -->
+                        <Dropdown v-else-if="u.id !== me?.id" placement="bottom-end" dropdownClass="w-60">
+                            <template #default="{ setRef, isOpen, toggle }">
+                                <button :ref="setRef" type="button" :aria-label="`Actions for ${u.name}`"
+                                    :disabled="busyId !== null" @click="toggle"
+                                    class="flex items-center justify-center w-7.5 h-7.5 rounded-md text-[var(--text-secondary)] @hover:bg-[var(--color-hover)] disabled:opacity-50 transition-colors duration-200"
+                                    :class="isOpen ? 'bg-[var(--color-hover)]' : ''">
+                                    <span class="i-tabler-dots text-4.5 pointer-events-none"></span>
+                                </button>
+                            </template>
+
+                            <template #dropdown="{ close }">
+                                <button v-if="u.role === 'admin'" type="button" role="menuitem" :class="MENU_ITEM_CLASS"
+                                    @click="close(); setRole(u, 'user')">
+                                    <span class="i-tabler-shield-minus text-4.5" aria-hidden="true"></span>
+                                    Remove admin
+                                </button>
+                                <button v-else type="button" role="menuitem" :class="MENU_ITEM_CLASS"
+                                    @click="close(); setRole(u, 'admin')">
+                                    <span class="i-tabler-shield-check text-4.5" aria-hidden="true"></span>
+                                    Make admin
+                                </button>
+                                <button v-if="u.twoFactorEnabled" type="button" role="menuitem" :class="MENU_ITEM_CLASS"
+                                    @click="close(); resetTwoFactor(u)">
+                                    <span class="i-tabler-shield-off text-4.5" aria-hidden="true"></span>
+                                    Reset two-factor
+                                </button>
+                                <button type="button" role="menuitem" :class="MENU_ITEM_CLASS"
+                                    @click="close(); signOutEverywhere(u)">
+                                    <span class="i-tabler-logout text-4.5" aria-hidden="true"></span>
+                                    Sign out all sessions
+                                </button>
+
+                                <hr class="w-full my-1 border-0 border-t border-[var(--color-border)]" />
+
+                                <button v-if="u.banned" type="button" role="menuitem" :class="MENU_ITEM_CLASS"
+                                    @click="close(); setDisabled(u, false)">
+                                    <span class="i-tabler-circle-check text-4.5" aria-hidden="true"></span>
+                                    Enable account
+                                </button>
+                                <button v-else type="button" role="menuitem" :class="MENU_ITEM_CLASS"
+                                    @click="close(); setDisabled(u, true)">
+                                    <span class="i-tabler-ban text-4.5" aria-hidden="true"></span>
+                                    Disable account
+                                </button>
+                                <button type="button" role="menuitem" :class="[MENU_ITEM_CLASS, 'text-red-400']"
+                                    @click="close(); deleteUser(u)">
+                                    <span class="i-tabler-trash text-4.5" aria-hidden="true"></span>
+                                    Delete account…
+                                </button>
+                            </template>
+                        </Dropdown>
+                    </span>
+                </div>
+
+                <div v-if="visibleUsers.length === 0"
+                    class="px-3 py-6 border-t border-[var(--color-border)] text-sm text-center text-[var(--text-secondary)]">
+                    {{ users.length === 0 ? 'No users to show.' : 'No users match.' }}
+                </div>
+            </div>
+        </div>
+
+        <p class="mt-4 max-w-190 text-[13px] leading-relaxed text-[var(--text-secondary)]">
+            Admins manage accounts, not content: chats, agents, files and API keys of other users are never
+            shown here. Disabled accounts can't sign in and nothing of theirs is deleted. Your own account is
+            managed from Profile and Security, and you can't remove your own admin role.
+        </p>
+    </div>
+</template>
diff --git a/drizzle/migrations/20261008182241_instance-settings/migration.sql b/drizzle/migrations/20261008182241_instance-settings/migration.sql
new file mode 100644
index 0000000..81d4875
--- /dev/null
+++ b/drizzle/migrations/20261008182241_instance-settings/migration.sql
@@ -0,0 +1,5 @@
+CREATE TABLE "instance_settings" (
+	"id" text PRIMARY KEY,
+	"registration" text DEFAULT 'open' NOT NULL,
+	"updated_at" timestamp with time zone DEFAULT now() NOT NULL
+);
diff --git a/drizzle/migrations/20261008182241_instance-settings/snapshot.json b/drizzle/migrations/20261008182241_instance-settings/snapshot.json
new file mode 100644
index 0000000..18abdf2
--- /dev/null
+++ b/drizzle/migrations/20261008182241_instance-settings/snapshot.json
@@ -0,0 +1,3094 @@
+{
+  "version": "8",
+  "dialect": "postgres",
+  "id": "2a4edef1-7e2b-45fe-aa8e-f7c8b32de18d",
+  "prevIds": [
+    "7ef2914b-4030-48de-a10a-d32840bc463c"
+  ],
+  "ddl": [
+    {
+      "values": [
+        "reasoning",
+        "text",
+        "tool-call",
+        "file"
+      ],
+      "name": "part_type",
+      "entityType": "enums",
+      "schema": "public"
+    },
+    {
+      "values": [
+        "user",
+        "assistant"
+      ],
+      "name": "role",
+      "entityType": "enums",
+      "schema": "public"
+    },
+    {
+      "values": [
+        "pending",
+        "completed",
+        "failed",
+        "cancelled"
+      ],
+      "name": "status",
+      "entityType": "enums",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "accounts",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "agents",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "attachments",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "embeddings",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "files",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "generations",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "instance_settings",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "message_parts",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "messages",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "models",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "providers",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "sessions",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "settings",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "tool_calls",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "topics",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "two_factors",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "users",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "verifications",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "id",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "account_id",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "provider_id",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "user_id",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "access_token",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "refresh_token",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "id_token",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "timestamp with time zone",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "access_token_expires_at",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "timestamp with time zone",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "refresh_token_expires_at",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "scope",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "password",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "timestamp with time zone",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": "now()",
+      "generated": null,
+      "identity": null,
+      "name": "created_at",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "timestamp with time zone",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "updated_at",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "id",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "agents"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "user_id",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "agents"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "name",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "agents"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
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+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "providers_pkey",
+      "schema": "public",
+      "table": "providers",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "sessions_pkey",
+      "schema": "public",
+      "table": "sessions",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "settings_pkey",
+      "schema": "public",
+      "table": "settings",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "tool_calls_pkey",
+      "schema": "public",
+      "table": "tool_calls",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "topics_pkey",
+      "schema": "public",
+      "table": "topics",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "two_factors_pkey",
+      "schema": "public",
+      "table": "two_factors",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "users_pkey",
+      "schema": "public",
+      "table": "users",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "verifications_pkey",
+      "schema": "public",
+      "table": "verifications",
+      "entityType": "pks"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "token"
+      ],
+      "nullsNotDistinct": false,
+      "name": "sessions_token_key",
+      "schema": "public",
+      "table": "sessions",
+      "entityType": "uniques"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "email"
+      ],
+      "nullsNotDistinct": false,
+      "name": "users_email_key",
+      "schema": "public",
+      "table": "users",
+      "entityType": "uniques"
+    }
+  ],
+  "renames": []
+}
\ No newline at end of file
diff --git a/drizzle/schema.ts b/drizzle/schema.ts
index 80d5003..1b91bdc 100644
--- a/drizzle/schema.ts
+++ b/drizzle/schema.ts
@@ -25,6 +25,19 @@ export enum ToolCallType {
     Json = 'json',
 }
 
+export const REGISTRATION_MODES = ['open', 'invite', 'closed'] as const;
+export type RegistrationMode = typeof REGISTRATION_MODES[number];
+
+export const INSTANCE_SETTINGS_ID = 'instance';
+
+// Settings of the whole instance, changed by admins. There is only ever the
+// one row with the id above.
+export const instanceSettings = pgTable('instance_settings', {
+    id: text('id').primaryKey(),
+    registration: text('registration').$type<RegistrationMode>().notNull().default('open'),
+    updatedAt: timestamptz('updated_at').notNull().defaultNow().$onUpdate(() => /* @__PURE__ */ new Date()),
+});
+
 export const settings = pgTable('settings', {
     id: text('id').primaryKey().$defaultFn(nanoid),
     userId: text('user_id').notNull(),
diff --git a/lib/auth.ts b/lib/auth.ts
index 59f4a18..255cc5d 100644
--- a/lib/auth.ts
+++ b/lib/auth.ts
@@ -7,15 +7,20 @@ import { admin } from 'better-auth/plugins/admin';
 import { defaultStatements } from 'better-auth/plugins/admin/access';
 import { twoFactor } from 'better-auth/plugins/two-factor';
 import * as schema from '../drizzle/schema';
+import { getRegistrationMode } from '../server/utils/instance';
+
+const MIN_PASSWORD_LENGTH = 8;
 
 const accessControl = createAccessControl(defaultStatements);
 
 // Admins manage accounts, not content. Signing in as someone else and setting
 // another user's password or email are left out on purpose: the first would
 // show their chats, the others would lock them out of their encrypted API keys.
+// Deleting is left out too, because Better Auth would only remove the account
+// and leave its agents, topics and files behind. /api/admin/users does that.
 const roles = {
     admin: accessControl.newRole({
-        user: ['create', 'list', 'set-role', 'ban', 'delete', 'get', 'update'],
+        user: ['create', 'list', 'set-role', 'ban', 'get', 'update'],
         session: ['list', 'revoke', 'delete'],
     }),
     user: accessControl.newRole({
@@ -44,10 +49,30 @@ export const auth = betterAuth({
     trustedOrigins: [process.env.NUXT_PUBLIC_URL ?? 'http://localhost:3000'],
 
     hooks: {
-        // The admin endpoints already stop admins from removing or disabling
-        // themselves. Giving up their own admin role is the one way left to
-        // end up with an instance nobody can manage, so that is refused too.
         before: createAuthMiddleware(async (ctx) => {
+            // Who may register is an instance setting admins change at runtime.
+            // Invite links do not exist yet, so only open instances take sign ups.
+            if (ctx.path === '/sign-up/email' && await getRegistrationMode() !== 'open') {
+                throw new APIError('FORBIDDEN', {
+                    message: 'Registration is closed on this instance',
+                    code: 'REGISTRATION_CLOSED',
+                });
+            }
+
+            // creating a user as an admin skips the sign up password rules
+            if (ctx.path === '/admin/create-user') {
+                const password = ctx.body?.password;
+                if (typeof password !== 'string' || password.length < MIN_PASSWORD_LENGTH) {
+                    throw new APIError('BAD_REQUEST', {
+                        message: 'Password is too short',
+                        code: 'PASSWORD_TOO_SHORT',
+                    });
+                }
+            }
+
+            // The admin endpoints already stop admins from removing or disabling
+            // themselves. Giving up their own admin role is the one way left to
+            // end up with an instance nobody can manage, so that is refused too.
             if (ctx.path !== '/admin/set-role' && ctx.path !== '/admin/update-user') return;
 
             const role = ctx.path === '/admin/set-role' ? ctx.body?.role : ctx.body?.data?.role;
diff --git a/server/api/account/index.delete.ts b/server/api/account/index.delete.ts
index e86fe44..3f8155a 100644
--- a/server/api/account/index.delete.ts
+++ b/server/api/account/index.delete.ts
@@ -1,26 +1,12 @@
 import { and, eq, ne } from 'drizzle-orm';
 import * as z from 'zod';
-import {
-    agents,
-    files,
-    models,
-    providers,
-    settings,
-    toolCalls,
-    topics,
-    users,
-} from '~~/drizzle/schema';
+import { users } from '~~/drizzle/schema';
 import { auth } from '~~/lib/auth';
 import { db } from '~~/server/lib/db';
 
 /**
- * Deletes the signed in user's account and everything that belongs to it.
- *
- * The app tables only store a plain user id, nothing cascades from the users
- * table, so every one of them is cleared here. It all happens in one
- * transaction: either the whole account is gone or nothing changed.
- *
- * Objects in file storage are left alone on purpose.
+ * Deletes the signed in user's account and everything that belongs to it,
+ * after they proved it is really them.
  */
 export default defineEventHandler(async (event) => {
     await protectRoute(event);
@@ -125,21 +111,7 @@ export default defineEventHandler(async (event) => {
         });
     }
 
-    await db.transaction(async (tx) => {
-        // messages, their parts, generations and attachments cascade from topics
-        await tx.delete(topics).where(eq(topics.userId, userId));
-        await tx.delete(agents).where(eq(agents.userId, userId));
-        await tx.delete(models).where(eq(models.userId, userId));
-        await tx.delete(providers).where(eq(providers.userId, userId));
-        // nothing points a tool call back at its message, so these never cascade
-        await tx.delete(toolCalls).where(eq(toolCalls.userId, userId));
-        // embeddings go with their file
-        await tx.delete(files).where(eq(files.userId, userId));
-        await tx.delete(settings).where(eq(settings.userId, userId));
-
-        // sessions, accounts and two-factor rows cascade from the user
-        await tx.delete(users).where(eq(users.id, userId));
-    });
+    await deleteAccount(userId);
 
     // the session is gone, but the browser would keep trusting its cached
     // copy for a few minutes unless the cookies go too
diff --git a/server/api/admin/instance.get.ts b/server/api/admin/instance.get.ts
new file mode 100644
index 0000000..eaabd6d
--- /dev/null
+++ b/server/api/admin/instance.get.ts
@@ -0,0 +1,9 @@
+export default defineEventHandler(async (event) => {
+    await protectAdminRoute(event);
+
+    return {
+        registration: await getRegistrationMode(),
+        // set when DISABLE_SIGNUP in the environment overrules the setting
+        registrationLocked: isRegistrationLocked(),
+    };
+});
diff --git a/server/api/admin/instance.put.ts b/server/api/admin/instance.put.ts
new file mode 100644
index 0000000..d061887
--- /dev/null
+++ b/server/api/admin/instance.put.ts
@@ -0,0 +1,43 @@
+import * as z from 'zod';
+import { INSTANCE_SETTINGS_ID, REGISTRATION_MODES, instanceSettings } from '~~/drizzle/schema';
+import { db } from '~~/server/lib/db';
+
+export default defineEventHandler(async (event) => {
+    await protectAdminRoute(event);
+
+    const result = await readValidatedBody(event, (body) =>
+        z
+            .object({
+                registration: z.enum(REGISTRATION_MODES),
+            })
+            .safeParse(body),
+    );
+
+    if (!result.success) {
+        throw createError({
+            statusCode: 400,
+            message: result.error.issues[0]!.message,
+        });
+    }
+
+    if (isRegistrationLocked()) {
+        throw createError({
+            statusCode: 409,
+            statusMessage: 'Registration is locked by the environment',
+            data: {
+                code: 'REGISTRATION_LOCKED',
+            },
+        });
+    }
+
+    const { registration } = result.data;
+
+    await db.insert(instanceSettings)
+        .values({ id: INSTANCE_SETTINGS_ID, registration })
+        .onConflictDoUpdate({
+            target: instanceSettings.id,
+            set: { registration, updatedAt: new Date() },
+        });
+
+    return { registration, registrationLocked: false };
+});
diff --git a/server/api/admin/users/[id]/index.delete.ts b/server/api/admin/users/[id]/index.delete.ts
new file mode 100644
index 0000000..0fe1021
--- /dev/null
+++ b/server/api/admin/users/[id]/index.delete.ts
@@ -0,0 +1,40 @@
+import { db } from '~~/server/lib/db';
+
+/**
+ * Deletes someone else's account and everything that belongs to it.
+ *
+ * Admins delete their own account from their profile, where it asks for the
+ * password and keeps the last admin from leaving.
+ */
+export default defineEventHandler(async (event) => {
+    await protectAdminRoute(event);
+
+    const id = getRouterParam(event, 'id')!;
+
+    if (id === event.context.user!.id) {
+        throw createError({
+            statusCode: 400,
+            statusMessage: 'You cannot delete your own account here',
+            data: {
+                code: 'CANNOT_DELETE_YOURSELF',
+            },
+        });
+    }
+
+    const account = await db.query.users.findFirst({
+        where: {
+            id,
+        },
+    });
+
+    if (!account) {
+        throw createError({
+            statusCode: 404,
+            statusMessage: 'User not found',
+        });
+    }
+
+    await deleteAccount(id);
+
+    return { ok: true };
+});
diff --git a/server/api/admin/users/[id]/two-factor.delete.ts b/server/api/admin/users/[id]/two-factor.delete.ts
new file mode 100644
index 0000000..2c3f75a
--- /dev/null
+++ b/server/api/admin/users/[id]/two-factor.delete.ts
@@ -0,0 +1,34 @@
+import { eq } from 'drizzle-orm';
+import { twoFactors, users } from '~~/drizzle/schema';
+import { db } from '~~/server/lib/db';
+
+/**
+ * Turns two-factor sign-in off for a user who lost their authenticator app
+ * and backup codes. They sign in with just their password again and can set
+ * it up from scratch.
+ */
+export default defineEventHandler(async (event) => {
+    await protectAdminRoute(event);
+
+    const id = getRouterParam(event, 'id')!;
+
+    const account = await db.query.users.findFirst({
+        where: {
+            id,
+        },
+    });
+
+    if (!account) {
+        throw createError({
+            statusCode: 404,
+            statusMessage: 'User not found',
+        });
+    }
+
+    await db.transaction(async (tx) => {
+        await tx.delete(twoFactors).where(eq(twoFactors.userId, id));
+        await tx.update(users).set({ twoFactorEnabled: false }).where(eq(users.id, id));
+    });
+
+    return { ok: true };
+});
diff --git a/server/api/admin/users/index.get.ts b/server/api/admin/users/index.get.ts
new file mode 100644
index 0000000..c2f4d3f
--- /dev/null
+++ b/server/api/admin/users/index.get.ts
@@ -0,0 +1,39 @@
+import { asc, eq, max } from 'drizzle-orm';
+import { sessions, users } from '~~/drizzle/schema';
+import { db } from '~~/server/lib/db';
+
+/**
+ * Every account of the instance, for the admin user list.
+ *
+ * Only what is needed to manage accounts is returned. Chats, agents, files and
+ * API keys of other users are never part of this.
+ */
+export default defineEventHandler(async (event) => {
+    await protectAdminRoute(event);
+
+    const rows = await db
+        .select({
+            id: users.id,
+            name: users.name,
+            email: users.email,
+            image: users.image,
+            role: users.role,
+            banned: users.banned,
+            twoFactorEnabled: users.twoFactorEnabled,
+            createdAt: users.createdAt,
+            // sessions are touched as they are used, the newest one is the
+            // closest thing there is to a last seen time
+            lastActiveAt: max(sessions.updatedAt),
+        })
+        .from(users)
+        .leftJoin(sessions, eq(sessions.userId, users.id))
+        .groupBy(users.id)
+        .orderBy(asc(users.createdAt));
+
+    return rows.map((row) => ({
+        ...row,
+        role: row.role === 'admin' ? 'admin' as const : 'user' as const,
+        banned: !!row.banned,
+        twoFactorEnabled: !!row.twoFactorEnabled,
+    }));
+});
diff --git a/server/api/instance.get.ts b/server/api/instance.get.ts
new file mode 100644
index 0000000..1ed6a49
--- /dev/null
+++ b/server/api/instance.get.ts
@@ -0,0 +1,6 @@
+// Public on purpose: the sign in pages ask this before anyone is signed in.
+export default defineEventHandler(async () => {
+    const [setupNeeded, registration] = await Promise.all([isSetupNeeded(), getRegistrationMode()]);
+
+    return { setupNeeded, registration };
+});
diff --git a/server/api/setup/index.get.ts b/server/api/setup/index.get.ts
deleted file mode 100644
index 7fc974b..0000000
--- a/server/api/setup/index.get.ts
+++ /dev/null
@@ -1,4 +0,0 @@
-// Public on purpose: the sign in pages ask this before anyone has an account.
-export default defineEventHandler(async () => {
-    return { needed: await isSetupNeeded() };
-});
diff --git a/server/utils/account.ts b/server/utils/account.ts
new file mode 100644
index 0000000..2aa099e
--- /dev/null
+++ b/server/utils/account.ts
@@ -0,0 +1,39 @@
+import { eq } from 'drizzle-orm';
+import {
+    agents,
+    files,
+    models,
+    providers,
+    settings,
+    toolCalls,
+    topics,
+    users,
+} from '~~/drizzle/schema';
+import { db } from '~~/server/lib/db';
+
+/**
+ * Deletes an account and everything that belongs to it.
+ *
+ * The app tables only store a plain user id, nothing cascades from the users
+ * table, so every one of them is cleared here. It all happens in one
+ * transaction: either the whole account is gone or nothing changed.
+ *
+ * Objects in file storage are left alone on purpose.
+ */
+export const deleteAccount = async (userId: string) => {
+    await db.transaction(async (tx) => {
+        // messages, their parts, generations and attachments cascade from topics
+        await tx.delete(topics).where(eq(topics.userId, userId));
+        await tx.delete(agents).where(eq(agents.userId, userId));
+        await tx.delete(models).where(eq(models.userId, userId));
+        await tx.delete(providers).where(eq(providers.userId, userId));
+        // nothing points a tool call back at its message, so these never cascade
+        await tx.delete(toolCalls).where(eq(toolCalls.userId, userId));
+        // embeddings go with their file
+        await tx.delete(files).where(eq(files.userId, userId));
+        await tx.delete(settings).where(eq(settings.userId, userId));
+
+        // sessions, accounts and two-factor rows cascade from the user
+        await tx.delete(users).where(eq(users.id, userId));
+    });
+};
diff --git a/server/utils/admin.ts b/server/utils/admin.ts
new file mode 100644
index 0000000..8a2ba72
--- /dev/null
+++ b/server/utils/admin.ts
@@ -0,0 +1,26 @@
+import type { H3Event } from 'h3';
+import { db } from '~~/server/lib/db';
+
+/**
+ * Like protectRoute(), but only lets admins through.
+ *
+ * The role is read from the database: the session cookie keeps a copy of the
+ * user for a few minutes, and someone who just stopped being an admin should
+ * not keep the access for that long.
+ */
+export const protectAdminRoute = async (event: H3Event) => {
+    await protectRoute(event);
+
+    const account = await db.query.users.findFirst({
+        where: {
+            id: event.context.user!.id as string,
+        },
+    });
+
+    if (account?.role !== 'admin' || account.banned) {
+        throw createError({
+            statusCode: 403,
+            statusMessage: 'Forbidden',
+        });
+    }
+};
diff --git a/server/utils/instance.ts b/server/utils/instance.ts
new file mode 100644
index 0000000..8b1bad3
--- /dev/null
+++ b/server/utils/instance.ts
@@ -0,0 +1,27 @@
+import { INSTANCE_SETTINGS_ID, REGISTRATION_MODES, type RegistrationMode } from '../../drizzle/schema';
+import { db } from '../lib/db';
+
+/**
+ * DISABLE_SIGNUP in the environment wins over whatever admins pick in the UI,
+ * so a deployment that was locked down this way stays locked down.
+ */
+export const isRegistrationLocked = (): boolean => {
+    const value = process.env.DISABLE_SIGNUP?.toLowerCase();
+
+    return value === 'true' || value === '1';
+};
+
+export const getRegistrationMode = async (): Promise<RegistrationMode> => {
+    if (isRegistrationLocked()) return 'closed';
+
+    const row = await db.query.instanceSettings.findFirst({
+        where: {
+            id: INSTANCE_SETTINGS_ID,
+        },
+    });
+
+    const mode = row?.registration;
+
+    // instances that never touched the setting keep taking sign ups like before
+    return mode !== undefined && REGISTRATION_MODES.includes(mode) ? mode : 'open';
+};