diff --git a/docs/docs.go b/docs/docs.go
index 35b6ad9..029414b 100644
--- a/docs/docs.go
+++ b/docs/docs.go
@@ -569,6 +569,93 @@ const docTemplate = `{
                 }
             }
         },
+        "/site": {
+            "get": {
+                "description": "Public site settings: site name, logo URL, and footer text. Returns built-in defaults when the settings row is missing.",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "site"
+                ],
+                "summary": "Get site settings",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/model.SiteSetting"
+                        }
+                    },
+                    "500": {
+                        "description": "Internal Server Error",
+                        "schema": {
+                            "$ref": "#/definitions/httpx.ErrorResponse"
+                        }
+                    }
+                }
+            },
+            "put": {
+                "security": [
+                    {
+                        "BearerAuth": []
+                    }
+                ],
+                "description": "Admin only. Update the site name, logo URL, and footer text; returns the updated settings.",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "site"
+                ],
+                "summary": "Update site settings",
+                "parameters": [
+                    {
+                        "description": "Site settings",
+                        "name": "site",
+                        "in": "body",
+                        "required": true,
+                        "schema": {
+                            "$ref": "#/definitions/site.UpdateRequest"
+                        }
+                    }
+                ],
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/model.SiteSetting"
+                        }
+                    },
+                    "400": {
+                        "description": "invalid request",
+                        "schema": {
+                            "$ref": "#/definitions/httpx.ErrorResponse"
+                        }
+                    },
+                    "401": {
+                        "description": "unauthorized or session expired",
+                        "schema": {
+                            "$ref": "#/definitions/httpx.ErrorResponse"
+                        }
+                    },
+                    "403": {
+                        "description": "admin permission required or account disabled",
+                        "schema": {
+                            "$ref": "#/definitions/httpx.ErrorResponse"
+                        }
+                    },
+                    "500": {
+                        "description": "Internal Server Error",
+                        "schema": {
+                            "$ref": "#/definitions/httpx.ErrorResponse"
+                        }
+                    }
+                }
+            }
+        },
         "/user-groups": {
             "get": {
                 "security": [
@@ -1355,6 +1442,26 @@ const docTemplate = `{
                 }
             }
         },
+        "model.SiteSetting": {
+            "type": "object",
+            "properties": {
+                "footer": {
+                    "type": "string",
+                    "example": "Copyright © Rill"
+                },
+                "logo": {
+                    "type": "string",
+                    "example": "https://example.com/logo.png"
+                },
+                "site_name": {
+                    "type": "string",
+                    "example": "Rill"
+                },
+                "updated_at": {
+                    "type": "string"
+                }
+            }
+        },
         "model.User": {
             "type": "object",
             "properties": {
@@ -1461,6 +1568,29 @@ const docTemplate = `{
                 }
             }
         },
+        "site.UpdateRequest": {
+            "type": "object",
+            "required": [
+                "site_name"
+            ],
+            "properties": {
+                "footer": {
+                    "type": "string",
+                    "maxLength": 1000,
+                    "example": "Copyright © Rill"
+                },
+                "logo": {
+                    "type": "string",
+                    "maxLength": 500,
+                    "example": "https://example.com/logo.png"
+                },
+                "site_name": {
+                    "type": "string",
+                    "maxLength": 100,
+                    "example": "Rill"
+                }
+            }
+        },
         "user.CreateRequest": {
             "type": "object",
             "required": [
diff --git a/docs/swagger.json b/docs/swagger.json
index 80141d5..f76eef0 100644
--- a/docs/swagger.json
+++ b/docs/swagger.json
@@ -562,6 +562,93 @@
                 }
             }
         },
+        "/site": {
+            "get": {
+                "description": "Public site settings: site name, logo URL, and footer text. Returns built-in defaults when the settings row is missing.",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "site"
+                ],
+                "summary": "Get site settings",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/model.SiteSetting"
+                        }
+                    },
+                    "500": {
+                        "description": "Internal Server Error",
+                        "schema": {
+                            "$ref": "#/definitions/httpx.ErrorResponse"
+                        }
+                    }
+                }
+            },
+            "put": {
+                "security": [
+                    {
+                        "BearerAuth": []
+                    }
+                ],
+                "description": "Admin only. Update the site name, logo URL, and footer text; returns the updated settings.",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "site"
+                ],
+                "summary": "Update site settings",
+                "parameters": [
+                    {
+                        "description": "Site settings",
+                        "name": "site",
+                        "in": "body",
+                        "required": true,
+                        "schema": {
+                            "$ref": "#/definitions/site.UpdateRequest"
+                        }
+                    }
+                ],
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/model.SiteSetting"
+                        }
+                    },
+                    "400": {
+                        "description": "invalid request",
+                        "schema": {
+                            "$ref": "#/definitions/httpx.ErrorResponse"
+                        }
+                    },
+                    "401": {
+                        "description": "unauthorized or session expired",
+                        "schema": {
+                            "$ref": "#/definitions/httpx.ErrorResponse"
+                        }
+                    },
+                    "403": {
+                        "description": "admin permission required or account disabled",
+                        "schema": {
+                            "$ref": "#/definitions/httpx.ErrorResponse"
+                        }
+                    },
+                    "500": {
+                        "description": "Internal Server Error",
+                        "schema": {
+                            "$ref": "#/definitions/httpx.ErrorResponse"
+                        }
+                    }
+                }
+            }
+        },
         "/user-groups": {
             "get": {
                 "security": [
@@ -1348,6 +1435,26 @@
                 }
             }
         },
+        "model.SiteSetting": {
+            "type": "object",
+            "properties": {
+                "footer": {
+                    "type": "string",
+                    "example": "Copyright © Rill"
+                },
+                "logo": {
+                    "type": "string",
+                    "example": "https://example.com/logo.png"
+                },
+                "site_name": {
+                    "type": "string",
+                    "example": "Rill"
+                },
+                "updated_at": {
+                    "type": "string"
+                }
+            }
+        },
         "model.User": {
             "type": "object",
             "properties": {
@@ -1454,6 +1561,29 @@
                 }
             }
         },
+        "site.UpdateRequest": {
+            "type": "object",
+            "required": [
+                "site_name"
+            ],
+            "properties": {
+                "footer": {
+                    "type": "string",
+                    "maxLength": 1000,
+                    "example": "Copyright © Rill"
+                },
+                "logo": {
+                    "type": "string",
+                    "maxLength": 500,
+                    "example": "https://example.com/logo.png"
+                },
+                "site_name": {
+                    "type": "string",
+                    "maxLength": 100,
+                    "example": "Rill"
+                }
+            }
+        },
         "user.CreateRequest": {
             "type": "object",
             "required": [
diff --git a/docs/swagger.yaml b/docs/swagger.yaml
index 89216f2..68052ba 100644
--- a/docs/swagger.yaml
+++ b/docs/swagger.yaml
@@ -85,6 +85,20 @@ definitions:
       updated_at:
         type: string
     type: object
+  model.SiteSetting:
+    properties:
+      footer:
+        example: Copyright © Rill
+        type: string
+      logo:
+        example: https://example.com/logo.png
+        type: string
+      site_name:
+        example: Rill
+        type: string
+      updated_at:
+        type: string
+    type: object
   model.User:
     properties:
       avatar:
@@ -157,6 +171,23 @@ definitions:
     required:
     - title
     type: object
+  site.UpdateRequest:
+    properties:
+      footer:
+        example: Copyright © Rill
+        maxLength: 1000
+        type: string
+      logo:
+        example: https://example.com/logo.png
+        maxLength: 500
+        type: string
+      site_name:
+        example: Rill
+        maxLength: 100
+        type: string
+    required:
+    - site_name
+    type: object
   user.CreateRequest:
     properties:
       avatar:
@@ -664,6 +695,64 @@ paths:
       summary: Update a note
       tags:
       - notes
+  /site:
+    get:
+      description: 'Public site settings: site name, logo URL, and footer text. Returns
+        built-in defaults when the settings row is missing.'
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            $ref: '#/definitions/model.SiteSetting'
+        "500":
+          description: Internal Server Error
+          schema:
+            $ref: '#/definitions/httpx.ErrorResponse'
+      summary: Get site settings
+      tags:
+      - site
+    put:
+      consumes:
+      - application/json
+      description: Admin only. Update the site name, logo URL, and footer text; returns
+        the updated settings.
+      parameters:
+      - description: Site settings
+        in: body
+        name: site
+        required: true
+        schema:
+          $ref: '#/definitions/site.UpdateRequest'
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            $ref: '#/definitions/model.SiteSetting'
+        "400":
+          description: invalid request
+          schema:
+            $ref: '#/definitions/httpx.ErrorResponse'
+        "401":
+          description: unauthorized or session expired
+          schema:
+            $ref: '#/definitions/httpx.ErrorResponse'
+        "403":
+          description: admin permission required or account disabled
+          schema:
+            $ref: '#/definitions/httpx.ErrorResponse'
+        "500":
+          description: Internal Server Error
+          schema:
+            $ref: '#/definitions/httpx.ErrorResponse'
+      security:
+      - BearerAuth: []
+      summary: Update site settings
+      tags:
+      - site
   /user-groups:
     get:
       description: List user groups ordered by id ASC. page starts at 1; page_size
diff --git a/frontend/src/App.vue b/frontend/src/App.vue
index a1180c1..dd28865 100644
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -1,10 +1,20 @@
 <script setup lang="ts">
-import { computed } from 'vue'
+import { computed, watch } from 'vue'
 import { RouterView, useRoute } from 'vue-router'
 import AppHeader from '@/components/layout/AppHeader.vue'
+import { useSiteStore } from '@/stores/site'
 
 const route = useRoute()
+const site = useSiteStore()
 const isBlank = computed(() => route.meta.blank === true)
+
+watch(
+  () => site.name,
+  (name) => {
+    document.title = name
+  },
+  { immediate: true },
+)
 </script>
 
 <template>
diff --git a/frontend/src/api/site.ts b/frontend/src/api/site.ts
new file mode 100644
index 0000000..ca3db05
--- /dev/null
+++ b/frontend/src/api/site.ts
@@ -0,0 +1,25 @@
+import { request } from './http'
+
+export interface SiteInfo {
+  site_name: string
+  logo: string
+  footer: string
+  updated_at: string
+}
+
+export interface UpdateSitePayload {
+  site_name: string
+  logo: string
+  footer: string
+}
+
+export function getSiteInfo(): Promise<SiteInfo> {
+  return request<SiteInfo>('/site')
+}
+
+export function updateSiteInfo(payload: UpdateSitePayload): Promise<SiteInfo> {
+  return request<SiteInfo>('/site', {
+    method: 'PUT',
+    body: JSON.stringify(payload),
+  })
+}
diff --git a/frontend/src/components/auth/AuthShell.vue b/frontend/src/components/auth/AuthShell.vue
index 9c6a5db..e99b6b0 100644
--- a/frontend/src/components/auth/AuthShell.vue
+++ b/frontend/src/components/auth/AuthShell.vue
@@ -1,5 +1,8 @@
 <script setup lang="ts">
 import { RouterLink } from 'vue-router'
+import { useSiteStore } from '@/stores/site'
+
+const site = useSiteStore()
 </script>
 
 <template>
@@ -9,10 +12,14 @@ import { RouterLink } from 'vue-router'
         :to="{ name: 'home' }"
         class="inline-flex items-center gap-2 text-xl font-bold text-accent"
       >
-        <span class="grid h-8 w-8 place-items-center rounded-lg bg-accent text-sm font-bold text-on-primary">
+        <img v-if="site.hasLogo" :src="site.logo" alt="" class="h-8 w-8 rounded-lg object-cover" />
+        <span
+          v-else
+          class="grid h-8 w-8 place-items-center rounded-lg bg-accent text-sm font-bold text-on-primary"
+        >
           R
         </span>
-        <span>Rill</span>
+        <span>{{ site.name }}</span>
       </RouterLink>
     </header>
 
diff --git a/frontend/src/components/layout/AppHeader.vue b/frontend/src/components/layout/AppHeader.vue
index 23a1532..3e34583 100644
--- a/frontend/src/components/layout/AppHeader.vue
+++ b/frontend/src/components/layout/AppHeader.vue
@@ -3,11 +3,13 @@ import { onMounted, onUnmounted, ref } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { RouterLink, useRoute, useRouter } from 'vue-router'
 import { useAuthStore } from '@/stores/auth'
+import { useSiteStore } from '@/stores/site'
 
 const { t } = useI18n()
 const route = useRoute()
 const router = useRouter()
 const auth = useAuthStore()
+const site = useSiteStore()
 
 const keyword = ref('')
 const menuOpen = ref(false)
@@ -35,10 +37,14 @@ function logout() {
   <header class="fixed inset-x-0 top-0 z-50 h-14 border-b border-line bg-surface">
     <div class="mx-auto flex h-full max-w-[1600px] items-center gap-6 px-4">
       <a href="/" class="flex shrink-0 items-center gap-2 text-xl font-bold text-accent">
-        <span class="grid h-8 w-8 place-items-center rounded-lg bg-accent text-sm font-bold text-on-primary">
+        <img v-if="site.hasLogo" :src="site.logo" alt="" class="h-8 w-8 rounded-lg object-cover" />
+        <span
+          v-else
+          class="grid h-8 w-8 place-items-center rounded-lg bg-accent text-sm font-bold text-on-primary"
+        >
           R
         </span>
-        <span>Rill</span>
+        <span>{{ site.name }}</span>
       </a>
 
       <nav class="hidden items-center gap-5 text-sm lg:flex">
@@ -102,6 +108,14 @@ function logout() {
               >
                 {{ t('header.profile') }}
               </RouterLink>
+              <RouterLink
+                v-if="auth.isAdmin"
+                :to="{ name: 'admin-site' }"
+                class="block w-full px-4 py-2 text-left text-sm text-content-2 transition-colors hover:bg-page hover:text-primary"
+                @click="menuOpen = false"
+              >
+                {{ t('header.admin') }}
+              </RouterLink>
               <button
                 type="button"
                 class="block w-full px-4 py-2 text-left text-sm text-content-2 transition-colors hover:bg-page hover:text-primary"
diff --git a/frontend/src/i18n/locales/en-US.ts b/frontend/src/i18n/locales/en-US.ts
index da288d5..a35a3c4 100644
--- a/frontend/src/i18n/locales/en-US.ts
+++ b/frontend/src/i18n/locales/en-US.ts
@@ -11,6 +11,7 @@ const enUS: MessageSchema = {
     login: 'Log in',
     userMenu: 'User menu',
     profile: 'Profile',
+    admin: 'Admin',
     logout: 'Log out',
   },
   home: {
@@ -118,6 +119,29 @@ const enUS: MessageSchema = {
       network: 'Network error, please try again later',
     },
   },
+  admin: {
+    title: 'Admin',
+    subtitle: 'Manage the site name, logo, and footer text',
+    siteInfo: 'Site information',
+    siteName: 'Site name',
+    siteNamePlaceholder: 'Shown in the browser title and page header',
+    logo: 'Logo image URL',
+    logoPlaceholder: 'https://example.com/logo.png',
+    logoHint: 'Falls back to the default “R” mark when empty',
+    logoPreview: 'Preview',
+    footer: 'Footer copyright text',
+    footerPlaceholder: 'Falls back to the localized default when empty',
+    save: 'Save changes',
+    saveSuccess: 'Site information updated',
+    errors: {
+      siteNameRequired: 'Site name is required',
+      siteNameLength: 'Site name must be at most 100 characters',
+      logoLength: 'Logo URL must be at most 500 characters',
+      footerLength: 'Footer text must be at most 1000 characters',
+      invalid: 'The submitted information is invalid, please check and retry',
+      network: 'Network error, please try again later',
+    },
+  },
 }
 
 export default enUS
diff --git a/frontend/src/i18n/locales/ja-JP.ts b/frontend/src/i18n/locales/ja-JP.ts
index 5cb0d9f..6a7dafe 100644
--- a/frontend/src/i18n/locales/ja-JP.ts
+++ b/frontend/src/i18n/locales/ja-JP.ts
@@ -11,6 +11,7 @@ const jaJP: MessageSchema = {
     login: 'ログイン',
     userMenu: 'ユーザーメニュー',
     profile: 'マイページ',
+    admin: '管理画面',
     logout: 'ログアウト',
   },
   home: {
@@ -118,6 +119,29 @@ const jaJP: MessageSchema = {
       network: 'ネットワークエラーが発生しました。後でもう一度お試しください',
     },
   },
+  admin: {
+    title: '管理画面',
+    subtitle: 'サイト名・ロゴ・フッター文言を管理します',
+    siteInfo: 'サイト情報',
+    siteName: 'サイト名',
+    siteNamePlaceholder: 'ブラウザのタイトルとページヘッダーに表示されます',
+    logo: 'ロゴ画像 URL',
+    logoPlaceholder: 'https://example.com/logo.png',
+    logoHint: '空欄の場合は既定の「R」マークを表示します',
+    logoPreview: 'プレビュー',
+    footer: 'フッターの著作権表示',
+    footerPlaceholder: '空欄の場合は多言語の既定文案を使用します',
+    save: '変更を保存',
+    saveSuccess: 'サイト情報を更新しました',
+    errors: {
+      siteNameRequired: 'サイト名を入力してください',
+      siteNameLength: 'サイト名は 100 文字以内で入力してください',
+      logoLength: 'ロゴ URL は 500 文字以内で入力してください',
+      footerLength: 'フッター文言は 1000 文字以内で入力してください',
+      invalid: '入力内容が無効です。確認してもう一度お試しください',
+      network: 'ネットワークエラーが発生しました。後でもう一度お試しください',
+    },
+  },
 }
 
 export default jaJP
diff --git a/frontend/src/i18n/locales/zh-CN.ts b/frontend/src/i18n/locales/zh-CN.ts
index 605bc7e..875bef0 100644
--- a/frontend/src/i18n/locales/zh-CN.ts
+++ b/frontend/src/i18n/locales/zh-CN.ts
@@ -9,6 +9,7 @@ const zhCN = {
     login: '登录',
     userMenu: '用户菜单',
     profile: '个人中心',
+    admin: '后台管理',
     logout: '退出登录',
   },
   home: {
@@ -116,6 +117,29 @@ const zhCN = {
       network: '网络异常，请稍后重试',
     },
   },
+  admin: {
+    title: '后台管理',
+    subtitle: '维护站点名称、Logo 与页脚文案',
+    siteInfo: '站点信息',
+    siteName: '网站名称',
+    siteNamePlaceholder: '显示在浏览器标题与页面头部',
+    logo: 'Logo 图片地址',
+    logoPlaceholder: 'https://example.com/logo.png',
+    logoHint: '留空时显示默认的 “R” 标识',
+    logoPreview: '预览',
+    footer: '页脚版权文案',
+    footerPlaceholder: '留空时使用多语言默认文案',
+    save: '保存修改',
+    saveSuccess: '站点信息已更新',
+    errors: {
+      siteNameRequired: '请填写网站名称',
+      siteNameLength: '网站名称最多 100 个字符',
+      logoLength: 'Logo 地址最多 500 个字符',
+      footerLength: '页脚文案最多 1000 个字符',
+      invalid: '提交的信息无效，请检查后重试',
+      network: '网络异常，请稍后重试',
+    },
+  },
 }
 
 export type MessageSchema = typeof zhCN
diff --git a/frontend/src/main.ts b/frontend/src/main.ts
index 0dc5b3a..b1a10ff 100644
--- a/frontend/src/main.ts
+++ b/frontend/src/main.ts
@@ -8,6 +8,7 @@ import router from './router'
 import { i18n } from './i18n'
 import { setUnauthorizedHandler } from './api/http'
 import { useAuthStore } from './stores/auth'
+import { useSiteStore } from './stores/site'
 
 const app = createApp(App)
 const pinia = createPinia()
@@ -19,6 +20,9 @@ app.use(i18n)
 const auth = useAuthStore()
 auth.restore()
 
+const site = useSiteStore()
+void site.load()
+
 setUnauthorizedHandler(() => {
   const wasAuthenticated = auth.isAuthenticated
   auth.logout()
diff --git a/frontend/src/router/index.ts b/frontend/src/router/index.ts
index b9478ea..9357ef4 100644
--- a/frontend/src/router/index.ts
+++ b/frontend/src/router/index.ts
@@ -6,6 +6,7 @@ declare module 'vue-router' {
   interface RouteMeta {
     blank?: boolean
     requiresAuth?: boolean
+    requiresAdmin?: boolean
   }
 }
 
@@ -35,18 +36,27 @@ const router = createRouter({
       component: () => import('../views/ProfileView.vue'),
       meta: { requiresAuth: true },
     },
+    {
+      path: '/admin/site',
+      name: 'admin-site',
+      component: () => import('../views/AdminSiteView.vue'),
+      meta: { requiresAuth: true, requiresAdmin: true },
+    },
   ],
 })
 
 router.beforeEach((to) => {
-  if (!to.meta.requiresAuth) {
+  if (!to.meta.requiresAuth && !to.meta.requiresAdmin) {
     return true
   }
   const auth = useAuthStore()
-  if (auth.isAuthenticated) {
-    return true
+  if (!auth.isAuthenticated) {
+    return { name: 'login', query: { redirect: to.fullPath } }
   }
-  return { name: 'login', query: { redirect: to.fullPath } }
+  if (to.meta.requiresAdmin && !auth.isAdmin) {
+    return { name: 'home' }
+  }
+  return true
 })
 
 export default router
diff --git a/frontend/src/stores/site.ts b/frontend/src/stores/site.ts
new file mode 100644
index 0000000..2bba40c
--- /dev/null
+++ b/frontend/src/stores/site.ts
@@ -0,0 +1,36 @@
+import { computed, ref } from 'vue'
+import { defineStore } from 'pinia'
+import { getSiteInfo, updateSiteInfo, type SiteInfo, type UpdateSitePayload } from '@/api/site'
+
+const DEFAULT_SITE_NAME = 'Rill'
+
+export const useSiteStore = defineStore('site', () => {
+  const siteName = ref('')
+  const logo = ref('')
+  const footer = ref('')
+
+  const name = computed(() => siteName.value || DEFAULT_SITE_NAME)
+  const hasLogo = computed(() => logo.value !== '')
+
+  function apply(info: SiteInfo) {
+    siteName.value = info.site_name.trim()
+    logo.value = info.logo.trim()
+    footer.value = info.footer.trim()
+  }
+
+  async function load() {
+    try {
+      apply(await getSiteInfo())
+    } catch {
+      // 站点信息加载失败时保留默认展示
+    }
+  }
+
+  async function save(payload: UpdateSitePayload): Promise<SiteInfo> {
+    const info = await updateSiteInfo(payload)
+    apply(info)
+    return info
+  }
+
+  return { siteName, logo, footer, name, hasLogo, load, save }
+})
diff --git a/frontend/src/views/AdminSiteView.vue b/frontend/src/views/AdminSiteView.vue
new file mode 100644
index 0000000..122cc16
--- /dev/null
+++ b/frontend/src/views/AdminSiteView.vue
@@ -0,0 +1,187 @@
+<script setup lang="ts">
+import { computed, onMounted, ref } from 'vue'
+import { useI18n } from 'vue-i18n'
+import { useForm } from 'vee-validate'
+import { toTypedSchema } from '@vee-validate/zod'
+import { z } from 'zod'
+import { ApiError } from '@/api/http'
+import { useSiteStore } from '@/stores/site'
+
+interface SiteForm {
+  siteName: string
+  logo: string
+  footer: string
+}
+
+const { t } = useI18n()
+const site = useSiteStore()
+
+const validationSchema = computed(() =>
+  toTypedSchema(
+    z.object({
+      siteName: z
+        .string()
+        .min(1, t('admin.errors.siteNameRequired'))
+        .max(100, t('admin.errors.siteNameLength')),
+      logo: z.string().max(500, t('admin.errors.logoLength')),
+      footer: z.string().max(1000, t('admin.errors.footerLength')),
+    }),
+  ),
+)
+
+const { defineField, handleSubmit, errors, isSubmitting, setValues } = useForm<SiteForm>({
+  validationSchema,
+  initialValues: {
+    siteName: site.siteName,
+    logo: site.logo,
+    footer: site.footer,
+  },
+})
+
+const [siteName, siteNameProps] = defineField('siteName')
+const [logo, logoProps] = defineField('logo')
+const [footer, footerProps] = defineField('footer')
+
+const submitError = ref('')
+const saved = ref(false)
+
+const logoPreview = computed(() => logo.value.trim())
+
+onMounted(async () => {
+  await site.load()
+  setValues({
+    siteName: site.siteName,
+    logo: site.logo,
+    footer: site.footer,
+  })
+})
+
+const onSubmit = handleSubmit(async (values) => {
+  submitError.value = ''
+  saved.value = false
+  try {
+    await site.save({
+      site_name: values.siteName,
+      logo: values.logo,
+      footer: values.footer,
+    })
+    saved.value = true
+  } catch (error) {
+    if (error instanceof ApiError && error.status >= 400 && error.status < 500) {
+      submitError.value = t('admin.errors.invalid')
+    } else {
+      submitError.value = t('admin.errors.network')
+    }
+  }
+})
+</script>
+
+<template>
+  <div class="mx-auto max-w-[1600px] px-4 py-6">
+    <div class="mx-auto max-w-2xl space-y-4">
+      <section class="rounded-2xl bg-surface p-6 shadow-sm ring-1 ring-line">
+        <h1 class="text-xl font-semibold">{{ t('admin.title') }}</h1>
+        <p class="mt-1 text-sm text-content-3">{{ t('admin.subtitle') }}</p>
+      </section>
+
+      <form
+        class="rounded-2xl bg-surface p-6 shadow-sm ring-1 ring-line sm:p-8"
+        novalidate
+        @submit="onSubmit"
+      >
+        <h2 class="text-base font-semibold">{{ t('admin.siteInfo') }}</h2>
+
+        <div class="mt-6">
+          <label for="site-name" class="mb-1.5 block text-sm text-content-2">
+            {{ t('admin.siteName') }}
+          </label>
+          <input
+            id="site-name"
+            v-model="siteName"
+            v-bind="siteNameProps"
+            type="text"
+            maxlength="100"
+            :placeholder="t('admin.siteNamePlaceholder')"
+            class="h-10 w-full rounded-lg border bg-page px-3 text-sm outline-none transition-colors placeholder:text-content-3 focus:border-primary"
+            :class="errors.siteName ? 'border-red-500' : 'border-line'"
+          />
+          <p v-if="errors.siteName" class="mt-1 text-xs text-red-500 dark:text-red-400">
+            {{ errors.siteName }}
+          </p>
+        </div>
+
+        <div class="mt-4">
+          <label for="site-logo" class="mb-1.5 block text-sm text-content-2">
+            {{ t('admin.logo') }}
+          </label>
+          <input
+            id="site-logo"
+            v-model="logo"
+            v-bind="logoProps"
+            type="url"
+            maxlength="500"
+            :placeholder="t('admin.logoPlaceholder')"
+            class="h-10 w-full rounded-lg border bg-page px-3 text-sm outline-none transition-colors placeholder:text-content-3 focus:border-primary"
+            :class="errors.logo ? 'border-red-500' : 'border-line'"
+          />
+          <p v-if="errors.logo" class="mt-1 text-xs text-red-500 dark:text-red-400">
+            {{ errors.logo }}
+          </p>
+          <div class="mt-3 flex items-center gap-3">
+            <span class="text-xs text-content-3">{{ t('admin.logoPreview') }}</span>
+            <img
+              v-if="logoPreview"
+              :src="logoPreview"
+              alt=""
+              class="h-10 w-10 rounded-lg object-cover ring-1 ring-line"
+            />
+            <span
+              v-else
+              class="grid h-10 w-10 place-items-center rounded-lg bg-accent text-sm font-bold text-on-primary"
+            >
+              R
+            </span>
+          </div>
+          <p class="mt-2 text-xs text-content-3">{{ t('admin.logoHint') }}</p>
+        </div>
+
+        <div class="mt-4">
+          <label for="site-footer" class="mb-1.5 block text-sm text-content-2">
+            {{ t('admin.footer') }}
+          </label>
+          <textarea
+            id="site-footer"
+            v-model="footer"
+            v-bind="footerProps"
+            rows="3"
+            maxlength="1000"
+            :placeholder="t('admin.footerPlaceholder')"
+            class="w-full rounded-lg border bg-page px-3 py-2 text-sm outline-none transition-colors placeholder:text-content-3 focus:border-primary"
+            :class="errors.footer ? 'border-red-500' : 'border-line'"
+          />
+          <p v-if="errors.footer" class="mt-1 text-xs text-red-500 dark:text-red-400">
+            {{ errors.footer }}
+          </p>
+        </div>
+
+        <p
+          v-if="submitError"
+          class="mt-4 rounded-lg bg-red-500/10 px-3 py-2 text-xs text-red-500 dark:text-red-400"
+        >
+          {{ submitError }}
+        </p>
+        <p v-else-if="saved" class="mt-4 rounded-lg bg-primary/10 px-3 py-2 text-xs text-primary">
+          {{ t('admin.saveSuccess') }}
+        </p>
+
+        <button
+          type="submit"
+          :disabled="isSubmitting"
+          class="mt-6 h-10 w-full rounded-full bg-primary text-sm font-medium text-on-primary transition-colors hover:bg-primary-hover disabled:cursor-not-allowed disabled:opacity-60 sm:w-auto sm:px-8"
+        >
+          {{ isSubmitting ? t('common.submitting') : t('admin.save') }}
+        </button>
+      </form>
+    </div>
+  </div>
+</template>
diff --git a/frontend/src/views/HomeView.vue b/frontend/src/views/HomeView.vue
index a2a7616..6ffe76a 100644
--- a/frontend/src/views/HomeView.vue
+++ b/frontend/src/views/HomeView.vue
@@ -4,8 +4,10 @@ import VideoSection from '@/components/home/VideoSection.vue'
 import LanguageSwitcher from '@/components/layout/LanguageSwitcher.vue'
 import ThemeSwitcher from '@/components/layout/ThemeSwitcher.vue'
 import { hotVideos, recommendVideos } from '@/mock/home'
+import { useSiteStore } from '@/stores/site'
 
 const { t } = useI18n()
+const site = useSiteStore()
 
 const recommendTabs = [
   'category.all',
@@ -43,7 +45,7 @@ const footerLinkKeys = [
           {{ t(key) }}
         </a>
       </nav>
-      <p>{{ t('footer.copyright') }}</p>
+      <p>{{ site.footer || t('footer.copyright') }}</p>
     </footer>
   </div>
 </template>
diff --git a/internal/api/api.go b/internal/api/api.go
index 2c2972e..a41850f 100644
--- a/internal/api/api.go
+++ b/internal/api/api.go
@@ -14,11 +14,12 @@ import (
 	"rill/internal/config"
 	"rill/internal/database"
 	"rill/internal/note"
+	"rill/internal/site"
 	"rill/internal/user"
 	"rill/internal/usergroup"
 )
 
-// RegisterRoutes 注册 API 路由。health、swagger、auth 公开；notes 与个人资料需登录；用户与用户组管理仅限管理员。
+// RegisterRoutes 注册 API 路由。health、swagger、auth 与站点信息读取公开；notes 与个人资料需登录；站点信息更新、用户与用户组管理仅限管理员。
 func RegisterRoutes(rg *gin.RouterGroup, db *gorm.DB, cfg *config.Config) {
 	authn := auth.NewAuthenticator(cfg)
 
@@ -38,6 +39,8 @@ func RegisterRoutes(rg *gin.RouterGroup, db *gorm.DB, cfg *config.Config) {
 		authGroup.POST("/login", auth.Login(db, authn))
 	}
 
+	rg.GET("/site", site.Get(db))
+
 	authed := rg.Group("", authn.RequireAuth(db))
 	{
 		authed.GET("/me", auth.Me())
@@ -55,6 +58,8 @@ func RegisterRoutes(rg *gin.RouterGroup, db *gorm.DB, cfg *config.Config) {
 
 	admin := rg.Group("", authn.RequireAuth(db), auth.RequireAdmin())
 	{
+		admin.PUT("/site", site.Update(db))
+
 		users := admin.Group("/users")
 		{
 			users.GET("", user.List(db))
diff --git a/internal/database/database_test.go b/internal/database/database_test.go
index d2349f8..364e923 100644
--- a/internal/database/database_test.go
+++ b/internal/database/database_test.go
@@ -76,6 +76,9 @@ func TestMigrateIdempotentAndCRUD(t *testing.T) {
 	if !db.Migrator().HasTable(&model.UserGroup{}) {
 		t.Error("user_groups 表未创建")
 	}
+	if !db.Migrator().HasTable(&model.SiteSetting{}) {
+		t.Error("site_settings 表未创建")
+	}
 	if !db.Migrator().HasTable(&schemaMigration{}) {
 		t.Error("schema_migrations 表未创建")
 	}
@@ -122,6 +125,14 @@ func TestMigrateIdempotentAndCRUD(t *testing.T) {
 		t.Errorf("初始管理员未加入 admin 组: count=%d", membership)
 	}
 
+	var setting model.SiteSetting
+	if err := db.WithContext(ctx).First(&setting, model.SiteSettingID).Error; err != nil {
+		t.Fatalf("默认站点信息未创建: %v", err)
+	}
+	if setting.SiteName != "Rill" || setting.Logo != "" || setting.Footer != "" {
+		t.Errorf("默认站点信息异常: %+v", setting)
+	}
+
 	passwordFile := adminPasswordPath(db)
 	raw, err := os.ReadFile(passwordFile)
 	if err != nil {
diff --git a/internal/database/migrate.go b/internal/database/migrate.go
index 6a447a8..9423a5e 100644
--- a/internal/database/migrate.go
+++ b/internal/database/migrate.go
@@ -90,6 +90,20 @@ var migrations = []Migration{
 			return tx.AutoMigrate(&model.User{})
 		},
 	},
+	{
+		Version: 7,
+		Name:    "create_site_settings",
+		Up: func(tx *gorm.DB) error {
+			if err := tx.AutoMigrate(&model.SiteSetting{}); err != nil {
+				return err
+			}
+			now := time.Now()
+			return tx.Exec(
+				"INSERT INTO site_settings (id, site_name, logo, footer, created_at, updated_at) VALUES (?, ?, '', '', ?, ?)",
+				model.SiteSettingID, "Rill", now, now,
+			).Error
+		},
+	},
 }
 
 // schemaMigration 记录已应用的迁移版本。
diff --git a/internal/model/site.go b/internal/model/site.go
new file mode 100644
index 0000000..deed425
--- /dev/null
+++ b/internal/model/site.go
@@ -0,0 +1,18 @@
+package model
+
+import "time"
+
+// SiteSettingID 站点设置的固定单行主键。
+const SiteSettingID uint = 1
+
+// SiteSetting 站点信息，全站仅一行，字段为空时前端回退默认展示。
+type SiteSetting struct {
+	ID        uint      `gorm:"primaryKey" json:"-"`
+	SiteName  string    `gorm:"size:100;not null;default:''" json:"site_name" example:"Rill"`
+	Logo      string    `gorm:"size:500" json:"logo" example:"https://example.com/logo.png"`
+	Footer    string    `gorm:"size:1000" json:"footer" example:"Copyright © Rill"`
+	CreatedAt time.Time `json:"-"`
+	UpdatedAt time.Time `json:"updated_at"`
+}
+
+func (SiteSetting) TableName() string { return "site_settings" }
diff --git a/internal/site/site.go b/internal/site/site.go
new file mode 100644
index 0000000..5719c99
--- /dev/null
+++ b/internal/site/site.go
@@ -0,0 +1,96 @@
+// Package site 提供站点信息（站名、Logo、页脚文案）的读取与管理员更新接口。
+package site
+
+import (
+	"errors"
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+
+	"rill/internal/httpx"
+	"rill/internal/model"
+)
+
+// UpdateRequest 更新站点信息请求，空 logo/footer 表示回退前端默认展示。
+type UpdateRequest struct {
+	SiteName string `json:"site_name" binding:"required,max=100" example:"Rill"`
+	Logo     string `json:"logo" binding:"omitempty,max=500" example:"https://example.com/logo.png"`
+	Footer   string `json:"footer" binding:"omitempty,max=1000" example:"Copyright © Rill"`
+}
+
+// @Summary      Get site settings
+// @Description  Public site settings: site name, logo URL, and footer text. Returns built-in defaults when the settings row is missing.
+// @Tags         site
+// @Produce      json
+// @Success      200  {object}  model.SiteSetting
+// @Failure      500  {object}  httpx.ErrorResponse
+// @Router       /site [get]
+func Get(db *gorm.DB) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		ctx := c.Request.Context()
+		var setting model.SiteSetting
+		if err := db.WithContext(ctx).First(&setting, model.SiteSettingID).Error; err != nil {
+			if errors.Is(err, gorm.ErrRecordNotFound) {
+				c.JSON(http.StatusOK, defaultSetting())
+				return
+			}
+			httpx.RespondDBError(c, err)
+			return
+		}
+		c.JSON(http.StatusOK, setting)
+	}
+}
+
+// @Summary      Update site settings
+// @Description  Admin only. Update the site name, logo URL, and footer text; returns the updated settings.
+// @Tags         site
+// @Accept       json
+// @Produce      json
+// @Param        site  body      site.UpdateRequest  true  "Site settings"
+// @Success      200   {object}  model.SiteSetting
+// @Failure      400   {object}  httpx.ErrorResponse  "invalid request"
+// @Security     BearerAuth
+// @Failure      401   {object}  httpx.ErrorResponse  "unauthorized or session expired"
+// @Failure      403   {object}  httpx.ErrorResponse  "admin permission required or account disabled"
+// @Failure      500   {object}  httpx.ErrorResponse
+// @Router       /site [put]
+func Update(db *gorm.DB) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		var req UpdateRequest
+		if err := c.ShouldBindJSON(&req); err != nil {
+			c.JSON(http.StatusBadRequest, httpx.ErrorResponse{Error: "invalid request: " + err.Error()})
+			return
+		}
+		req.SiteName = strings.TrimSpace(req.SiteName)
+		if req.SiteName == "" {
+			c.JSON(http.StatusBadRequest, httpx.ErrorResponse{Error: "invalid request: site_name is required"})
+			return
+		}
+
+		ctx := c.Request.Context()
+		var setting model.SiteSetting
+		if err := db.WithContext(ctx).First(&setting, model.SiteSettingID).Error; err != nil {
+			if !errors.Is(err, gorm.ErrRecordNotFound) {
+				httpx.RespondDBError(c, err)
+				return
+			}
+			setting = defaultSetting()
+		}
+
+		setting.SiteName = req.SiteName
+		setting.Logo = req.Logo
+		setting.Footer = req.Footer
+		if err := db.WithContext(ctx).Save(&setting).Error; err != nil {
+			httpx.RespondDBError(c, err)
+			return
+		}
+		c.JSON(http.StatusOK, setting)
+	}
+}
+
+// defaultSetting 设置行缺失时的内置默认值。
+func defaultSetting() model.SiteSetting {
+	return model.SiteSetting{ID: model.SiteSettingID, SiteName: "Rill"}
+}
diff --git a/internal/site/site_test.go b/internal/site/site_test.go
new file mode 100644
index 0000000..54c157b
--- /dev/null
+++ b/internal/site/site_test.go
@@ -0,0 +1,116 @@
+package site_test
+
+import (
+	"encoding/json"
+	"net/http"
+	"strings"
+	"testing"
+
+	"rill/internal/model"
+	"rill/internal/testutil"
+)
+
+func decodeSetting(t *testing.T, body []byte) model.SiteSetting {
+	t.Helper()
+	var setting model.SiteSetting
+	if err := json.Unmarshal(body, &setting); err != nil {
+		t.Fatalf("解析站点设置响应失败: %v, body=%s", err, body)
+	}
+	return setting
+}
+
+func registerUser(t *testing.T, env *testutil.Env) model.User {
+	t.Helper()
+	w := testutil.Call(t, env.Router(""), http.MethodPost, "/api/auth/register", map[string]string{
+		"username": "siteuser", "email": "siteuser@example.com", "password": "secret123",
+	})
+	if w.Code != http.StatusCreated {
+		t.Fatalf("注册普通用户失败: %d, body=%s", w.Code, w.Body.String())
+	}
+	return testutil.DecodeUser(t, w)
+}
+
+func TestSiteSettings(t *testing.T) {
+	env := testutil.Setup(t)
+	public := env.Router("")
+
+	w := testutil.Call(t, public, http.MethodGet, "/api/site", nil)
+	if w.Code != http.StatusOK {
+		t.Fatalf("读取站点信息状态码 = %d, 期望 %d, body=%s", w.Code, http.StatusOK, w.Body.String())
+	}
+	seeded := decodeSetting(t, w.Body.Bytes())
+	if seeded.SiteName != "Rill" || seeded.Logo != "" || seeded.Footer != "" {
+		t.Fatalf("默认站点信息异常: %+v", seeded)
+	}
+
+	if w := testutil.Call(t, public, http.MethodPut, "/api/site", map[string]any{"site_name": "Hacked"}); w.Code != http.StatusUnauthorized {
+		t.Errorf("匿名更新状态码 = %d, 期望 %d", w.Code, http.StatusUnauthorized)
+	}
+
+	registered := registerUser(t, env)
+	normal := env.Router(env.Sign(registered.ID))
+	if w := testutil.Call(t, normal, http.MethodPut, "/api/site", map[string]any{"site_name": "Hacked"}); w.Code != http.StatusForbidden {
+		t.Errorf("普通用户更新状态码 = %d, 期望 %d, body=%s", w.Code, http.StatusForbidden, w.Body.String())
+	}
+
+	admin := env.AdminRouter()
+	w = testutil.Call(t, admin, http.MethodPut, "/api/site", map[string]any{
+		"site_name": "Rill 流媒体",
+		"logo":      "https://example.com/logo.png",
+		"footer":    "Copyright © 2026 Rill",
+	})
+	if w.Code != http.StatusOK {
+		t.Fatalf("管理员更新状态码 = %d, 期望 %d, body=%s", w.Code, http.StatusOK, w.Body.String())
+	}
+	updated := decodeSetting(t, w.Body.Bytes())
+	if updated.SiteName != "Rill 流媒体" || updated.Logo != "https://example.com/logo.png" || updated.Footer != "Copyright © 2026 Rill" {
+		t.Fatalf("更新结果异常: %+v", updated)
+	}
+
+	w = testutil.Call(t, public, http.MethodGet, "/api/site", nil)
+	if w.Code != http.StatusOK {
+		t.Fatalf("更新后读取状态码 = %d, 期望 %d", w.Code, http.StatusOK)
+	}
+	if got := decodeSetting(t, w.Body.Bytes()); got.SiteName != updated.SiteName || got.Logo != updated.Logo || got.Footer != updated.Footer {
+		t.Errorf("更新后读取结果异常: %+v", got)
+	}
+
+	var stored model.SiteSetting
+	if err := env.DB.First(&stored, model.SiteSettingID).Error; err != nil {
+		t.Fatalf("查询数据库失败: %v", err)
+	}
+	if stored.SiteName != updated.SiteName || stored.Logo != updated.Logo || stored.Footer != updated.Footer {
+		t.Errorf("数据库未更新: %+v", stored)
+	}
+}
+
+func TestSiteSettingsValidation(t *testing.T) {
+	env := testutil.Setup(t)
+	admin := env.AdminRouter()
+
+	cases := []struct {
+		name string
+		body map[string]any
+	}{
+		{"缺少站名", map[string]any{"logo": "https://example.com/logo.png"}},
+		{"站名为空白", map[string]any{"site_name": "   "}},
+		{"站名超长", map[string]any{"site_name": strings.Repeat("站", 101)}},
+		{"Logo 超长", map[string]any{"site_name": "Rill", "logo": strings.Repeat("a", 501)}},
+		{"Footer 超长", map[string]any{"site_name": "Rill", "footer": strings.Repeat("a", 1001)}},
+	}
+	for _, tc := range cases {
+		w := testutil.Call(t, admin, http.MethodPut, "/api/site", tc.body)
+		if w.Code != http.StatusBadRequest {
+			t.Errorf("%s 状态码 = %d, 期望 %d, body=%s", tc.name, w.Code, http.StatusBadRequest, w.Body.String())
+		}
+	}
+
+	w := testutil.Call(t, admin, http.MethodPut, "/api/site", map[string]any{"site_name": "Rill", "logo": "", "footer": ""})
+	if w.Code != http.StatusOK {
+		t.Fatalf("清空可选字段状态码 = %d, 期望 %d, body=%s", w.Code, http.StatusOK, w.Body.String())
+	}
+	cleared := decodeSetting(t, w.Body.Bytes())
+	if cleared.Logo != "" || cleared.Footer != "" {
+		t.Errorf("清空失败: %+v", cleared)
+	}
+}