diff --git a/apps/web/src/components/EditorPane.tsx b/apps/web/src/components/EditorPane.tsx
index 4bcc88d4..98c06687 100644
--- a/apps/web/src/components/EditorPane.tsx
+++ b/apps/web/src/components/EditorPane.tsx
@@ -31,6 +31,7 @@ import {
   CircleAlert,
   LoaderCircle,
   Info,
+  FileDown,
   Printer,
 } from "lucide-react";
 import { Button } from "@/components/ui/button";
@@ -98,6 +99,7 @@ import { ThemeBlock } from "./ThemeBlock";
 import { SystemInfoDialog } from "./SystemInfoDialog";
 import { fetchLatestRelease, isVersionOutdated } from "@/lib/version-check";
 import { RELEASE_STATUS_EVENT } from "@/lib/release-notice";
+import { downloadMarkdownFile } from "@/lib/note-markdown-export";
 import { openNotePrintPreview, serializeNoteDocumentForPrint } from "@/lib/note-print";
 
 const SUPPORTED_PASTE_IMAGE_TYPES = new Set(["image/png", "image/jpeg", "image/gif", "image/webp", "image/avif"]);
@@ -2052,6 +2054,32 @@ const RichEditorPane = ({
     useMobilePlainTextEditor,
   ]);
 
+  const handleExportMarkdown = useCallback(() => {
+    if (!isEditorReady(editor) || !memo) {
+      return;
+    }
+
+    const markdown = useMobilePlainTextEditor
+      ? getMobilePlainTextValue()
+      : useMarkdownSourceEditor
+        ? markdownSource
+        : docToMarkdown(editor.getJSON() as TiptapDoc);
+    downloadMarkdownFile(
+      markdown,
+      title,
+      t("common.untitledMemo")
+    );
+  }, [
+    editor,
+    getMobilePlainTextValue,
+    markdownSource,
+    memo,
+    t,
+    title,
+    useMarkdownSourceEditor,
+    useMobilePlainTextEditor,
+  ]);
+
   useEffect(() => {
     if (!useMobilePlainTextEditor) {
       return;
@@ -2805,6 +2833,13 @@ const RichEditorPane = ({
                   <History className="h-4 w-4 text-slate-500" />
                   {t("editor.versionHistory")}
                 </DropdownMenuItem>
+                <DropdownMenuItem
+                  className="flex h-9 w-full items-center gap-2 px-3 text-left text-sm text-slate-700 hover:bg-slate-50 cursor-pointer outline-none"
+                  onClick={handleExportMarkdown}
+                >
+                  <FileDown className="h-4 w-4 text-slate-500" />
+                  {t("editor.exportMarkdown")}
+                </DropdownMenuItem>
                 <DropdownMenuItem
                   className="flex h-9 w-full items-center gap-2 px-3 text-left text-sm text-slate-700 hover:bg-slate-50 cursor-pointer outline-none"
                   onClick={handleExportPdf}
diff --git a/apps/web/src/lib/note-markdown-export.ts b/apps/web/src/lib/note-markdown-export.ts
new file mode 100644
index 00000000..42f72344
--- /dev/null
+++ b/apps/web/src/lib/note-markdown-export.ts
@@ -0,0 +1,31 @@
+const WINDOWS_RESERVED_NAME = /^(con|prn|aux|nul|com[1-9]|lpt[1-9])(?:\.|$)/i;
+
+export const buildMarkdownFilename = (title: string, fallback: string) => {
+  const sanitized = title
+    .replace(/[\u0000-\u001f<>:"/\\|?*]/g, "-")
+    .replace(/\s+/g, " ")
+    .replace(/[. ]+$/g, "")
+    .trim()
+    .slice(0, 100);
+  const basename = sanitized || fallback;
+  const safeBasename = WINDOWS_RESERVED_NAME.test(basename) ? `_${basename}` : basename;
+  return /\.md$/i.test(safeBasename) ? safeBasename : `${safeBasename}.md`;
+};
+
+export const createMarkdownFile = (markdown: string, title: string, fallback: string) => ({
+  blob: new Blob([markdown], { type: "text/markdown;charset=utf-8" }),
+  filename: buildMarkdownFilename(title, fallback),
+});
+
+export const downloadMarkdownFile = (markdown: string, title: string, fallback: string) => {
+  const { blob, filename } = createMarkdownFile(markdown, title, fallback);
+  const url = URL.createObjectURL(blob);
+  const link = document.createElement("a");
+  link.href = url;
+  link.download = filename;
+  link.hidden = true;
+  document.body.appendChild(link);
+  link.click();
+  link.remove();
+  window.setTimeout(() => URL.revokeObjectURL(url), 0);
+};
diff --git a/packages/shared/src/i18n/en-US.ts b/packages/shared/src/i18n/en-US.ts
index 73c13dd0..13d85b79 100644
--- a/packages/shared/src/i18n/en-US.ts
+++ b/packages/shared/src/i18n/en-US.ts
@@ -576,6 +576,7 @@ export const enUS = {
     searchCurrentMemo: "Search current note",
     replaceCurrentMemo: "Replace in current note",
     versionHistory: "Version history",
+    exportMarkdown: "Export Markdown",
     exportPdf: "Export PDF",
     pdfExport: {
       preparing: "Preparing print preview…",
diff --git a/packages/shared/src/i18n/zh-CN.ts b/packages/shared/src/i18n/zh-CN.ts
index 299e2cb5..34fe5cce 100644
--- a/packages/shared/src/i18n/zh-CN.ts
+++ b/packages/shared/src/i18n/zh-CN.ts
@@ -576,6 +576,7 @@ export const zhCN = {
     searchCurrentMemo: "搜索当前笔记",
     replaceCurrentMemo: "替换当前笔记",
     versionHistory: "版本历史",
+    exportMarkdown: "导出 Markdown",
     exportPdf: "导出 PDF",
     pdfExport: {
       preparing: "正在生成打印预览…",
diff --git a/tests/note-markdown-export.test.ts b/tests/note-markdown-export.test.ts
new file mode 100644
index 00000000..364d6cd6
--- /dev/null
+++ b/tests/note-markdown-export.test.ts
@@ -0,0 +1,22 @@
+import { describe, expect, test } from "bun:test";
+import {
+  buildMarkdownFilename,
+  createMarkdownFile,
+} from "../apps/web/src/lib/note-markdown-export";
+
+describe("single-note Markdown export", () => {
+  test("creates a UTF-8 Markdown file with the current content", async () => {
+    const file = createMarkdownFile("# 标题\n\n当前未保存内容", "项目 / 计划", "Untitled note");
+
+    expect(file.filename).toBe("项目 - 计划.md");
+    expect(file.blob.type).toBe("text/markdown;charset=utf-8");
+    expect(await file.blob.text()).toBe("# 标题\n\n当前未保存内容");
+  });
+
+  test("sanitizes unsafe and reserved filenames", () => {
+    expect(buildMarkdownFilename("CON", "Untitled note")).toBe("_CON.md");
+    expect(buildMarkdownFilename('<>:"/\\|?*', "Untitled note")).toBe("---------.md");
+    expect(buildMarkdownFilename("...", "Untitled note")).toBe("Untitled note.md");
+    expect(buildMarkdownFilename("README.md", "Untitled note")).toBe("README.md");
+  });
+});