Word（.docx）をマークダウンに変換する無料オンラインツール
Convert Word (.docx) files to Markdown. Preserves headings, tables, and lists. Runs entirely in your browser — safe for confidential documents.
Wordファイル（.docx）をここにドロップ、またはクリックで選択
or
Supported formats: .docx ／ 複数ファイル選択可
What the Word to Markdown Converter can do
This free online tool converts Word (.docx) files to Markdown entirely inside your browser. Your document is never uploaded, and headings, tables, and lists from your Word file are preserved in the Markdown output.
Supported Word file format (.docx)
Supports .docx files from Word 2007 and later. For legacy .doc files, please re-save as .docx in Word before converting.
Preserved after conversion: headings, tables, lists, and links
Headings (H1–H6), paragraphs, bullet and numbered lists, tables (GFM pipe syntax), bold, italic, and hyperlinks are carried over into the Markdown output.
Not reflected in Markdown: images and complex layouts
Embedded images, shapes, multi-column layouts, and headers/footers go beyond what Markdown can express and are simplified or dropped. You may want to adjust these manually.
Three steps to convert a Word file to Markdown
- Drag and drop your .docx file, or click to select one.
- Press the "Convert to Markdown" button and check the result in the preview pane.
- Copy to clipboard, or download the .md file.
Your Word file is never sent to any server
How in-browser conversion works (mammoth.js)
This tool uses the mammoth.js library to parse the .docx directly in your browser and convert it to Markdown in JavaScript. No file content is ever sent to sakutto servers.
Why it's safe for confidential Word documents
Because nothing is transmitted, you can safely convert confidential documents such as contracts, minutes, and internal reports. Close the tab and no data remains.
Use cases for Word to Markdown conversion
- Migrating drafts written in Word into note, Zenn, or Qiita as ready-to-paste Markdown.
- Pasting Word content into ChatGPT or Claude with less formatting noise and lower token usage.
- Importing documents into Obsidian or Notion as clean Markdown for your knowledge base.
Converting other formats to Markdown
- Convert PDF to Markdown (PDF to Markdown converter)
- Convert Excel (.xlsx) to Markdown (Excel to Markdown converter)
- Convert PowerPoint (.pptx) to Markdown (PowerPoint to Markdown converter)
- Convert HTML to Markdown (HTML to Markdown converter)
- Convert a web page URL to Markdown (URL to Markdown converter)
- Convert any file to Markdown (File to Markdown hub)
Why Word to Markdown Converter on sakutto is safe
Many online tools upload your files to external servers for processing. This tool never sends your Word (.docx) files to any server — everything is processed entirely in your browser.
* Some AI-powered tools require server-side processing. Tools that send data to a server will always notify you beforehand.
| Comparison | Typical online tools | sakutto |
|---|---|---|
| Where data is sent | Uploaded to external servers | Nowhere — processed in your browser |
| Data leak risk | Risk during transfer and server storage | No risk — no network transfer occurs |
| External traffic | File data travels over the internet | No file data appears in network logs |
| Offline use | Not possible (server required) | Works offline after initial load |
How browser-based processing works
- WebAssembly (WASM): Processes Word (.docx) files in your browser at near-native speed. No server communication occurs.
- Web Workers: Runs on a background thread separate from the main thread, so your browser stays responsive during processing.
- After processing, your browser automatically frees the data from memory. No Word (.docx) files remains outside your device.
For IT security teams: How to verify
You can verify that sakutto never sends your Word (.docx) files externally by checking the Network tab in your browser's DevTools while using the tool. You'll see that no requests involving your Word (.docx) files are made. This can also serve as documentation for your IT security team.
Frequently asked questions about the Word to Markdown Converter
Can I convert old .doc files too?
Only .docx (Word 2007+) is supported. Please re-save your .doc file as .docx in Word before converting.
What happens to images inside the Word file?
Images are not embedded in the Markdown output. An empty image reference (with alt text, if present) is placed where the image was so you can swap them in manually.
Are tables and bullet lists preserved?
Yes. Headings, paragraphs, bullet and numbered lists, tables (GFM pipe syntax), bold/italic, and links are preserved. Complex layouts are simplified.
Are my files stored anywhere?
No. All processing happens inside your browser. Neither the .docx file nor the Markdown output is sent to or stored on sakutto servers.