diff --git a/frontend/src/features/editor/VisualMarkdownEditor.vue b/frontend/src/features/editor/VisualMarkdownEditor.vue
index ee235c9..b0a1b39 100644
--- a/frontend/src/features/editor/VisualMarkdownEditor.vue
+++ b/frontend/src/features/editor/VisualMarkdownEditor.vue
@@ -1,6 +1,5 @@
 <script setup lang="ts">
 import { onBeforeUnmount, onMounted, ref } from 'vue'
-import { CollectionTag, Edit, EditPen, List, Memo } from '@element-plus/icons-vue'
 import { Crepe } from '@milkdown/crepe'
 import {
   toggleEmphasisCommand,
@@ -10,10 +9,10 @@ import {
   wrapInOrderedListCommand,
 } from '@milkdown/kit/preset/commonmark'
 import { callCommand } from '@milkdown/kit/utils'
-import AppIcon from '@/components/common/AppIcon.vue'
 import { useEditorStore } from '@/stores/editor'
 import { useSettingsStore } from '@/stores/settings'
 import { highlightCode } from '@/utils/markdown'
+import { applyMarkdownFontSize, fontSizeMarkdownPlugin } from './fontSizeMarkdown'
 import '@milkdown/crepe/theme/common/style.css'
 import '@milkdown/crepe/theme/frame.css'
 
@@ -24,13 +23,12 @@ const editorRoot = ref<HTMLElement | null>(null)
 const loading = ref(true)
 let crepe: Crepe | null = null
 
-type ToolbarCommand = 'heading' | 'bold' | 'italic' | 'ordered-list' | 'bullet-list'
+type ToolbarCommand = 'bold' | 'italic' | 'ordered-list' | 'bullet-list'
 
 function runCommand(command: ToolbarCommand) {
   const editor = crepe?.editor
   if (!editor) return
   const actions = {
-    heading: callCommand(wrapInHeadingCommand.key, 2),
     bold: callCommand(toggleStrongCommand.key),
     italic: callCommand(toggleEmphasisCommand.key),
     'ordered-list': callCommand(wrapInOrderedListCommand.key),
@@ -40,6 +38,21 @@ function runCommand(command: ToolbarCommand) {
   editorRoot.value?.querySelector<HTMLElement>('.ProseMirror')?.focus()
 }
 
+function applyHeading(event: Event) {
+  const level = Number((event.target as HTMLSelectElement).value)
+  if (!level || !crepe) return
+  crepe.editor.action(callCommand(wrapInHeadingCommand.key, level))
+  editorRoot.value?.querySelector<HTMLElement>('.ProseMirror')?.focus()
+  ;(event.target as HTMLSelectElement).value = ''
+}
+
+function applyFontSize(event: Event) {
+  const size = Number((event.target as HTMLSelectElement).value)
+  if (!size || !crepe) return
+  applyMarkdownFontSize(crepe.editor, size)
+  ;(event.target as HTMLSelectElement).value = ''
+}
+
 onMounted(async () => {
   crepe = new Crepe({
     root: editorRoot.value,
@@ -63,6 +76,7 @@ onMounted(async () => {
       },
     },
   })
+  crepe.editor.use(fontSizeMarkdownPlugin)
   crepe.on((listener) => {
     listener.markdownUpdated((_ctx, markdown, previousMarkdown) => {
       if (markdown === previousMarkdown || markdown === editorStore.content) return
@@ -80,12 +94,26 @@ onBeforeUnmount(() => { void crepe?.destroy() })
 <template>
   <div class="visual-editor">
     <div class="markdown-toolbar" role="toolbar" aria-label="Markdown 格式工具栏">
-      <button type="button" title="二级标题" @click="runCommand('heading')"><AppIcon :icon="CollectionTag" /><span>标题</span></button>
-      <button type="button" title="加粗 (Ctrl+B)" @click="runCommand('bold')"><AppIcon :icon="Edit" /><span>加粗</span></button>
-      <button type="button" title="斜体 (Ctrl+I)" @click="runCommand('italic')"><AppIcon :icon="EditPen" /><span>斜体</span></button>
+      <label class="toolbar-select heading-select" title="设置标题级别">
+        <span class="format-glyph heading-glyph">H</span>
+        <select aria-label="标题级别" @change="applyHeading">
+          <option value="" selected>标题</option>
+          <option v-for="level in 6" :key="level" :value="level">H{{ level }}</option>
+        </select>
+      </label>
+      <button type="button" title="加粗 (Ctrl+B)" aria-label="加粗" @mousedown.prevent @click="runCommand('bold')"><strong class="format-glyph">B</strong></button>
+      <button type="button" title="斜体 (Ctrl+I)" aria-label="斜体" @mousedown.prevent @click="runCommand('italic')"><em class="format-glyph">I</em></button>
       <span class="toolbar-divider" />
-      <button type="button" title="有序列表" @click="runCommand('ordered-list')"><AppIcon :icon="Memo" /><span>有序列表</span></button>
-      <button type="button" title="无序列表" @click="runCommand('bullet-list')"><AppIcon :icon="List" /><span>无序列表</span></button>
+      <button type="button" class="list-glyph" title="有序列表" aria-label="有序列表" @mousedown.prevent @click="runCommand('ordered-list')">1.</button>
+      <button type="button" class="list-glyph" title="无序列表" aria-label="无序列表" @mousedown.prevent @click="runCommand('bullet-list')">•</button>
+      <span class="toolbar-divider" />
+      <label class="toolbar-select font-size-select" title="修改选中文字的字号">
+        <span class="format-glyph font-size-glyph">A</span>
+        <select aria-label="文字字号" @change="applyFontSize">
+          <option value="" selected>字号</option>
+          <option v-for="size in [12, 14, 16, 18, 20, 24, 28, 32]" :key="size" :value="size">{{ size }} px</option>
+        </select>
+      </label>
     </div>
     <div v-if="loading" class="editor-loading">正在加载编辑器…</div>
     <div ref="editorRoot" class="milkdown-host" :class="{ loading }" />
@@ -95,10 +123,16 @@ onBeforeUnmount(() => { void crepe?.destroy() })
 <style scoped>
 .visual-editor { display: flex; flex: 1; min-height: 0; flex-direction: column; background: var(--color-background-primary); }
 .markdown-toolbar { display: flex; align-items: center; flex-wrap: wrap; gap: 2px; min-height: 42px; padding: 5px var(--space-lg); border-bottom: 1px solid var(--color-border-subtle); background: var(--color-surface-primary); }
-.markdown-toolbar button { display: inline-flex; align-items: center; gap: 5px; min-height: 30px; padding: 4px 8px; border-radius: var(--radius-sm); color: var(--color-text-secondary); }
-.markdown-toolbar button:hover { background: var(--color-background-hover); color: var(--color-text-primary); }
-.markdown-toolbar button:focus-visible { outline: 2px solid var(--color-border-focus); outline-offset: 1px; }
-.markdown-toolbar button span { font-size: var(--font-size-xs); }
+.markdown-toolbar button { display: inline-grid; place-items: center; min-width: 32px; min-height: 30px; padding: 4px 8px; border-radius: var(--radius-sm); color: var(--color-text-primary); }
+.markdown-toolbar button:hover, .toolbar-select:hover { background: var(--color-background-hover); color: var(--color-text-primary); }
+.markdown-toolbar button:focus-visible, .toolbar-select:focus-within { outline: 2px solid var(--color-border-focus); outline-offset: 1px; }
+.format-glyph { font-family: Georgia, 'Times New Roman', serif; font-size: 17px; line-height: 1; }
+.heading-glyph { font-weight: 800; }
+.font-size-glyph { font-size: 18px; }
+.list-glyph { font-size: 17px; font-weight: 700; }
+.toolbar-select { display: inline-flex; align-items: center; gap: 4px; min-height: 30px; padding: 3px 5px 3px 8px; border-radius: var(--radius-sm); color: var(--color-text-primary); }
+.toolbar-select select { min-width: 58px; border: 0; outline: 0; background: transparent; color: inherit; cursor: pointer; font-size: var(--font-size-sm); }
+.font-size-select select { min-width: 62px; }
 .toolbar-divider { width: 1px; height: 20px; margin: 0 var(--space-xs); background: var(--color-border-default); }
 .milkdown-host { flex: 1; min-height: 0; overflow: auto; color: var(--color-text-primary); }
 .milkdown-host.loading { visibility: hidden; }
@@ -129,6 +163,11 @@ onBeforeUnmount(() => { void crepe?.destroy() })
 }
 .milkdown-host :deep(.ProseMirror) { box-sizing: border-box; width: min(100%, var(--editor-line-width, 80ch)); min-height: 100%; margin: 0 auto; padding: var(--space-3xl) var(--space-xl); outline: none; font-family: var(--font-editor-sans); font-size: var(--font-editor-size); line-height: var(--font-editor-line-height); caret-color: var(--color-accent-primary); }
 .milkdown-host :deep(.ProseMirror-selectednode) { outline-color: var(--color-accent-primary); }
+.milkdown-host :deep(.ProseMirror h1), .milkdown-host :deep(.ProseMirror h2), .milkdown-host :deep(.ProseMirror h3), .milkdown-host :deep(.ProseMirror h4), .milkdown-host :deep(.ProseMirror h5), .milkdown-host :deep(.ProseMirror h6) { font-weight: 700; }
+.milkdown-host :deep(.font-size-marker) { display: none; }
+.milkdown-host :deep(.milkdown-toolbar) { border: 1px solid var(--color-border-default); background: var(--color-surface-elevated); box-shadow: var(--shadow-md); }
+.milkdown-host :deep(.milkdown-toolbar .toolbar-item svg), .milkdown-host :deep(.milkdown-toolbar .toolbar-item.active svg) { color: var(--color-text-primary); fill: var(--color-text-primary); stroke: currentColor; opacity: 1; }
+.milkdown-host :deep(.milkdown-toolbar .toolbar-item:hover svg) { color: var(--color-accent-primary); fill: var(--color-accent-primary); }
 .milkdown-host :deep(code) { font-family: var(--font-editor-mono); }
 .milkdown-host :deep(.shiki) { box-sizing: border-box; width: 100%; overflow: auto; padding: var(--space-md); border-radius: var(--radius-md); }
 :global([data-theme='dark']) .milkdown-host :deep(.shiki),
@@ -140,5 +179,5 @@ onBeforeUnmount(() => { void crepe?.destroy() })
   text-decoration: var(--shiki-dark-text-decoration) !important;
 }
 :global([data-theme='dark']) .milkdown-host :deep(.milkdown) { color-scheme: dark; }
-@media (max-width: 680px) { .markdown-toolbar button span { display: none; } }
+@media (max-width: 680px) { .toolbar-select select { min-width: 46px; width: 46px; } }
 </style>
diff --git a/frontend/src/features/editor/fontSizeMarkdown.ts b/frontend/src/features/editor/fontSizeMarkdown.ts
new file mode 100644
index 0000000..83e99f4
--- /dev/null
+++ b/frontend/src/features/editor/fontSizeMarkdown.ts
@@ -0,0 +1,64 @@
+import { $prose } from '@milkdown/kit/utils'
+import { Plugin, TextSelection } from '@milkdown/kit/prose/state'
+import { Decoration, DecorationSet } from '@milkdown/kit/prose/view'
+import type { Editor } from '@milkdown/kit/core'
+import { editorViewCtx } from '@milkdown/kit/core'
+
+const openingTag = /^<span style="font-size:\s*(\d+(?:\.\d+)?)px">$/i
+const closingTag = /^<\/span>$/i
+
+export const fontSizeMarkdownPlugin = $prose(() => new Plugin({
+  props: {
+    decorations(state) {
+      const decorations: Decoration[] = []
+      const stack: Array<{ from: number; size: string }> = []
+
+      state.doc.descendants((node, position) => {
+        if (node.type.name !== 'html') return
+        const value = String(node.attrs.value ?? '')
+        const match = value.match(openingTag)
+
+        if (match) {
+          stack.push({ from: position + node.nodeSize, size: match[1] })
+          decorations.push(Decoration.node(position, position + node.nodeSize, { class: 'font-size-marker' }))
+          return
+        }
+
+        if (closingTag.test(value)) {
+          const opening = stack.pop()
+          decorations.push(Decoration.node(position, position + node.nodeSize, { class: 'font-size-marker' }))
+          if (opening && opening.from < position) {
+            decorations.push(Decoration.inline(opening.from, position, {
+              style: `font-size: ${opening.size}px`,
+              'data-font-size': opening.size,
+            }))
+          }
+        }
+      })
+
+      return DecorationSet.create(state.doc, decorations)
+    },
+  },
+}))
+
+export function applyMarkdownFontSize(editor: Editor, size: number): boolean {
+  return editor.action((ctx) => {
+    const view = ctx.get(editorViewCtx)
+    const { from, to, empty } = view.state.selection
+    if (empty) return false
+
+    const htmlNode = view.state.schema.nodes.html
+    if (!htmlNode) return false
+
+    const opening = htmlNode.create({ value: `<span style="font-size: ${size}px">` })
+    const closing = htmlNode.create({ value: '</span>' })
+    const transaction = view.state.tr
+      .insert(to, closing)
+      .insert(from, opening)
+    transaction.setSelection(TextSelection.create(transaction.doc, from + 1, to + 1))
+
+    view.dispatch(transaction)
+    view.focus()
+    return true
+  })
+}