diff --git a/web/src/app/SettingsDialog.vue b/web/src/app/SettingsDialog.vue
index 42100f3..5f6fb7c 100644
--- a/web/src/app/SettingsDialog.vue
+++ b/web/src/app/SettingsDialog.vue
@@ -5,7 +5,7 @@ import { allCommands, formatKeys, runCommand } from './commands'
 import Icon, { type IconName } from './Icon.vue'
 import AppearanceSettings from './AppearanceSettings.vue'
 import PluginsPanel from './PluginsPanel.vue'
-import { CONTENT_WIDTHS, FONT_SIZES, loadSettings, settings, updateSettings, type Settings } from './settings'
+import { CONTENT_WIDTHS, FONT_SIZES, TAB_SIZES, loadSettings, settings, updateSettings, type Settings } from './settings'
 import SharePanel from './SharePanel.vue'
 import TokensPanel from './TokensPanel.vue'
 import TrashPanel from './TrashPanel.vue'
@@ -13,6 +13,7 @@ import { toast, ws, type SettingsSection } from './workspace'
 
 const SECTIONS: { id: SettingsSection; title: string; icon: IconName }[] = [
   { id: 'appearance', title: '外观', icon: 'palette' },
+  { id: 'editor', title: '编辑器', icon: 'edit' },
   { id: 'plugins', title: '插件', icon: 'command' },
   { id: 'account', title: '账户', icon: 'user' },
   { id: 'shortcuts', title: '快捷键', icon: 'command' },
@@ -135,6 +136,22 @@ async function changePassword() {
             <p class="rm-share-note">设置保存在服务器上，所有设备共用。</p>
           </template>
 
+          <template v-else-if="section === 'editor'">
+            <div class="rm-setting">
+              <label for="rm-spellcheck" class="rm-setting-label">拼写检查</label>
+              <input id="rm-spellcheck" type="checkbox" :checked="settings.spellcheck" @change="change({ spellcheck: ($event.target as HTMLInputElement).checked })" />
+            </div>
+            <p class="rm-share-note">使用浏览器的拼写检查，检查语言取决于浏览器设置。</p>
+            <div class="rm-setting">
+              <label for="rm-tab-size" class="rm-setting-label">制表符宽度</label>
+              <select id="rm-tab-size" :value="settings.tabSize" @change="change({ tabSize: Number(($event.target as HTMLSelectElement).value) })">
+                <option v-for="n in TAB_SIZES" :key="n" :value="n">{{ n }} 列</option>
+              </select>
+            </div>
+            <p class="rm-share-note">仅调整 Tab 字符的显示宽度，不改写正文。Tab 键仍按两个空格缩进。</p>
+            <p class="rm-share-note">设置保存在服务器上，所有设备共用。</p>
+          </template>
+
           <template v-else-if="section === 'account'">
             <form class="rm-auth-card rm-settings-form" @submit.prevent="changePassword">
               <h3>修改登录密码</h3>
diff --git a/web/src/app/settings.ts b/web/src/app/settings.ts
index f137ccb..08a067a 100644
--- a/web/src/app/settings.ts
+++ b/web/src/app/settings.ts
@@ -5,6 +5,7 @@ import { api } from './api'
 import { applyAppearance, appearancePaused, sanitizeAppearance, type Appearance } from '../themes/appearance'
 
 export const FONT_SIZES = [14, 15, 16, 17, 18, 20, 22]
+export const TAB_SIZES = [2, 4, 8]
 // 0 为全宽
 export const CONTENT_WIDTHS = [
   { label: '窄', value: 680 },
@@ -15,7 +16,7 @@ export const CONTENT_WIDTHS = [
 
 export const SIDEBAR_WIDTH = { min: 200, max: 480 }
 
-const DEFAULTS = { fontSize: 16, contentWidth: 760, sidebarWidth: 260 }
+const DEFAULTS = { fontSize: 16, contentWidth: 760, sidebarWidth: 260, spellcheck: false, tabSize: 4 }
 export type Settings = typeof DEFAULTS & Appearance
 
 const CACHE_KEY = 'rawmark.settings'
@@ -27,6 +28,8 @@ function sanitize(raw: Record<string, unknown>): Settings {
   const pick = <T>(v: unknown, allowed: T[], def: T) => (allowed.includes(v as T) ? (v as T) : def)
   return {
     fontSize: pick(raw.fontSize, FONT_SIZES, DEFAULTS.fontSize),
+    spellcheck: typeof raw.spellcheck === 'boolean' ? raw.spellcheck : DEFAULTS.spellcheck,
+    tabSize: pick(raw.tabSize, TAB_SIZES, DEFAULTS.tabSize),
     ...sanitizeAppearance(raw),
     contentWidth: pick(
       raw.contentWidth,
diff --git a/web/src/app/workspace.ts b/web/src/app/workspace.ts
index c8ea92b..942cec5 100644
--- a/web/src/app/workspace.ts
+++ b/web/src/app/workspace.ts
@@ -1,9 +1,9 @@
 // 工作区状态与操作：目录树、标签页、保存队列、冲突处理、实时同步。
 // 文件操作一律先更新界面再请求服务器，失败时回滚，保证"操作即时生效"。
-import { Annotation, Transaction, type EditorState } from '@codemirror/state'
+import { Annotation, EditorState, Transaction } from '@codemirror/state'
 import { EditorView } from '@codemirror/view'
 import { nextTick, reactive, watch } from 'vue'
-import { createEditorState, insertImageFiles, pasteImages, languageCompartment, pluginCompartment, pluginEditorExtensions, pluginLanguage } from '../editor'
+import { createEditorState, insertImageFiles, pasteImages, languageCompartment, pluginCompartment, pluginEditorExtensions, pluginLanguage, preferencesCompartment } from '../editor'
 import { handleShortcut, registerCommand } from './commands'
 import { api, ApiError, type Entry } from './api'
 import { drafts } from './drafts'
@@ -30,7 +30,7 @@ export interface Tab {
   conflictRev?: string
 }
 
-export type SettingsSection = 'appearance' | 'account' | 'shortcuts' | 'shares' | 'tokens' | 'trash' | 'plugins'
+export type SettingsSection = 'appearance' | 'editor' | 'account' | 'shortcuts' | 'shares' | 'tokens' | 'trash' | 'plugins'
 
 export interface Toast {
   id: number
@@ -176,6 +176,8 @@ function buildState(path: string, doc: string): EditorState {
   noteRefs.set(path, ref)
   return createEditorState({
     doc,
+    spellcheck: settings.spellcheck,
+    tabSize: settings.tabSize,
     resolveImage: (src) => resolveAssetUrl(ref.path, src),
     onChange: (u) => {
       editorStates.set(ref.path, u.state)
@@ -944,6 +946,21 @@ export async function startWorkspace() {
     () => [settings.fontSize, settings.contentWidth, settings.sidebarWidth],
     () => view?.requestMeasure(),
   )
+  watch(
+    () => [settings.spellcheck, settings.tabSize],
+    () => {
+      const effects = preferencesCompartment.reconfigure([
+        EditorState.tabSize.of(settings.tabSize),
+        EditorView.contentAttributes.of({ spellcheck: String(settings.spellcheck) }),
+      ])
+      for (const [path, state] of editorStates) {
+        if (path === ws.active && view) {
+          view.dispatch({ effects })
+          editorStates.set(path, view.state)
+        } else editorStates.set(path, state.update({ effects }).state)
+      }
+    },
+  )
   window.addEventListener('rawmark-appearance', () => requestAnimationFrame(() => view?.requestMeasure()))
   window.addEventListener('rawmark-plugin-notice', (event) => toast((event as CustomEvent<string>).detail))
   // 页面隐藏/关闭前尽力发出待保存的修改（部分浏览器关闭标签页时只触发 pagehide）
diff --git a/web/src/editor/index.ts b/web/src/editor/index.ts
index 96ec3d1..e0121b1 100644
--- a/web/src/editor/index.ts
+++ b/web/src/editor/index.ts
@@ -20,6 +20,7 @@ export { insertImageFiles, pasteImages } from './paste'
 // 沿用其语言数据，markdownKeymap 中的命令据此识别 Markdown（isActiveAt 按语言数据判断）
 export const pluginCompartment = new Compartment()
 export const languageCompartment = new Compartment()
+export const preferencesCompartment = new Compartment()
 export function pluginLanguage() { return new Language(
   markdownLanguage.data,
   (markdownLanguage.parser as MarkdownParser).configure([typoraExtensions, ...[...markdownSyntax.values()].map((entry) => entry.value)]),
@@ -30,6 +31,8 @@ export function pluginEditorExtensions(): Extension[] { return [...editorExtensi
 
 export interface EditorStateOptions {
   doc: string
+  spellcheck?: boolean
+  tabSize?: number
   resolveImage?: (src: string) => string
   // 文档变化回调，仅对挂载在视图上的状态触发；未激活标签页的状态由调用方直接更新
   onChange?: (update: ViewUpdate) => void
@@ -65,7 +68,11 @@ export function createEditorState(opts: EditorStateOptions): EditorState {
     // CodeMirror 只在 Linux/Mac 上把 Ctrl/Cmd+Shift+Z 绑定为重做，Windows 上会退化成撤销；
     // 与 Typora、VS Code 保持一致，所有平台都支持
     keymap.of([indentWithTab, { key: 'Mod-Shift-z', run: redo, preventDefault: true }, ...defaultKeymap, ...historyKeymap]),
-    EditorView.contentAttributes.of({ spellcheck: 'false', autocapitalize: 'sentences' }),
+    preferencesCompartment.of([
+      EditorState.tabSize.of(opts.tabSize ?? 4),
+      EditorView.contentAttributes.of({ spellcheck: String(opts.spellcheck ?? false) }),
+    ]),
+    EditorView.contentAttributes.of({ autocapitalize: 'sentences' }),
   ]
   if (opts.resolveImage) extensions.push(resolveImageUrl.of(opts.resolveImage))
   if (opts.onChange) {