Yomu.
Write. Polish. Publish.
Editor
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## Yomu へようこそ
**Yomu** は、Markdown を書いて、**公開先に合わせて整える**ためのブラウザエディタです。インストールもアカウント登録も要りません。書いた原稿は note・WordPress・はてなブログ・Zenn / Qiita・Word・PDF・HTML へ、それぞれの形式に合わせて書き出せます。
> 入力した文書の編集・変換は、すべてこのブラウザの中で行います。変換のために本文をサーバーへ送ることはありません。
## 3 ステップで使う
1. **開く / 貼る** — 「ファイルを開く」（↑ のアイコン）から `.md` / `.txt` を読み込むか、AI の回答などをそのまま貼り付けます。ウィンドウへのドラッグ＆ドロップにも対応しています。
2. **書く** — エディタに直接入力します。ツールバーやショートカット（⌘ / Ctrl + B など）で装飾できます。
3. **書き出す** — 「エクスポート」から、note・WordPress・はてなブログ・Zenn / Qiita 向けの変換、Word（.docx）・PDF・HTML の保存ができます。
## 読みやすさのための機能
- **目次**（≡ のアイコン。広い画面では右に常時表示）は、読んでいる位置に合わせて自動で追従します。
- 上部の細いバーは、**読み進めた量**を表します。
- 下のバーには、**文字数**と**推定読了時間**が表示されます。
- **?**（ヘルプ）のメニューから、**ダークモード**と**文字サイズ**を切り替えられます。
## 書き方の例
### テキストの装飾
**太字**、*斜体*、~~取り消し線~~、`インラインコード`、そして [oka-project のサイト](/) のようなリンクが使えます。
### リスト
- 箇条書き
- 入れ子のリスト
- [x] 終わったこと
- [ ] これからやること
### 表
| 項目 | 対応 |
|------|:----:|
| 見出し | ✓ |
| 表 | ✓ |
| コード | ✓ |
### コードブロック
```js
// シンタックスハイライトに対応しています
function greet(name) {
return `こんにちは、${name} さん`;
}
```
---
困ったときは、**?**（ヘルプ）からショートカットと記法の早見表を開けます。それでは、よい執筆を。
## Welcome to Yomu
**Yomu** is a browser-based Markdown editor for writing and then **shaping your draft for wherever it's going**. There's nothing to install and no account to create. When you're done, export to note, WordPress, Hatena Blog, Zenn / Qiita, Word, PDF, or HTML, each in the format that platform expects.
> Editing and conversion happen entirely in this browser. Your text is never sent to a server to be converted.
## Three steps
1. **Open or paste** — Use "Open file" in the top right to load a `.md` or `.txt` file, or paste text straight in, such as an answer from an AI assistant. You can also drag and drop a file anywhere in the window.
2. **Write** — Type in the editor on the left. Use the toolbar above it, or shortcuts like ⌘ / Ctrl + B, to add formatting.
3. **Export** — Open "Export" to convert for note, WordPress, Hatena Blog, or Zenn / Qiita, or to save as Word (.docx), PDF, or HTML.
## Built for reading
- The **contents** panel on the right follows along as you scroll. Collapse it to give the text more room.
- The thin bar across the top shows **how far you've read**.
- The status bar at the bottom shows the **character count** and an **estimated reading time**.
- The icons in the top right switch **dark mode** and **text size**.
## Formatting examples
### Text styles
You can use **bold**, *italic*, ~~strikethrough~~, `inline code`, and links like [the oka-project site](/).
### Lists
- Bullet list
- Nested item
- [x] Done
- [ ] Still to do
### Tables
| Feature | Supported |
|---------|:---------:|
| Headings | ✓ |
| Tables | ✓ |
| Code | ✓ |
### Code blocks
```js
// Syntax highlighting is built in
function greet(name) {
return `Hello, ${name}`;
}
```
---
Stuck? The **?** in the top right opens a quick reference for shortcuts and syntax. Happy writing.
Yomu — Markdown editor in your browser
A Markdown editor that helps you shape your draft for wherever it's going. Export to note, WordPress, Hatena Blog, Zenn, Word, or PDF.
Ctrl+B Bold Ctrl+K Link Ctrl+F Find Ctrl+H Replace Ctrl+D Duplicate line Ctrl+S Save Markdown
Your draft is auto-saved only in this browser (localStorage): one draft, no history. Found a bug or have a request? Contact oka-project.
How to use Yomu
- Paste or open — Paste an answer from ChatGPT or Claude as is, or click "Open file" to load a
.md/.txtfile (drag and drop into the window also works). - Polish — Write on the left and check the result in the preview on the right. Use the toolbar and shortcuts to add headings, bold, links, and tables.
- Export for your platform — Open "Export" and pick a conversion for note, WordPress, Hatena Blog, or Zenn / Qiita, or save as Word (.docx), PDF, or HTML.
Your work in progress is auto-saved in this browser (one draft only). It doesn't carry over to other devices.
When it comes in handy
- Move an AI draft to note — AI assistants answer in Markdown, but pasting that straight into note (a Japanese blogging platform) breaks headings and bullet lists. Yomu reshapes it for note first.
- Publish to WordPress — Headings, lists, and code become Gutenberg blocks you can paste into the code editor.
- Post to Hatena Blog — Converts to Hatena syntax (the markup used by the Japanese blogging service) with the table-of-contents tag already in place.
- Hand in a Word file — Export what you wrote in Markdown as .docx, ready to format for submission.
- Send a PDF — Save the clean, readable layout as a PDF from the print dialog.
FAQ
- Is my document sent anywhere?
- No. Editing and conversion happen entirely in your browser, and this site has no server-side endpoint that could receive your document. On top of that, the page's Content-Security-Policy restricts outbound connections altogether. The only network traffic is page-view and action-type analytics (Google Analytics: which format you copied or saved to) used to understand how the site is used; your document and file names are never part of it.
- Do I need to sign up or install anything?
- No. It works the moment the page opens, and it's free.
- Is my draft saved?
- One draft is auto-saved in this browser (localStorage) and restored the next time you open the page. There is no history or version control, and it won't appear on another device or in another browser.
- How complete is the note conversion?
- Headings, bullet lists, quotes, links, code, and more are reshaped into what note's editor understands. Tables are simplified to plain text, and footnote support is partial. After pasting, give just those two things a quick look.
- How do I paste into WordPress?
- Paste the exported content into the post's code editor (in the block editor, the "⋮" menu → "Code editor"). If you paste into the visual editor, it won't be recognized as blocks.
- My post looks broken on Hatena Blog
- Check that the post's editing mode is set to "Hatena syntax". In the visual ("見たまま") or Markdown modes, the converted Hatena syntax is shown as raw text.
- Do images go into the Word file?
- No. The .docx export covers the document structure (headings, paragraphs, emphasis, lists, tables) and doesn't embed images automatically. Add images in Word.
- I linked an image from another site, but it doesn't show
- That's by design. Loading an external image in the preview would send a request to that site (revealing your IP address, among other things). Keeping your document inside the browser is the core of this tool, so it skips them by default. Exported files keep the original URLs, so the images will show where you publish.
- How is this different from Markdown Viewer?
- Markdown Viewer is for opening, reading, and saving as PDF, errands that take a few seconds. Yomu is for writing, polishing, and converting to a publishing platform's format. Just reading? Use Viewer. Finishing a draft? Use Yomu.
- I heard bold doesn't always work in Japanese text
- Yomu extends bold so that Japanese with brackets or punctuation right inside the asterisks, like
**「重要」**, is rendered bold. This differs from standard Markdown (CommonMark), so if you paste raw Markdown into Zenn, Qiita, or GitHub, it may not come out bold. Exports to Hatena, WordPress, Word, PDF, and HTML go through HTML and aren't affected. - Can I manage several drafts?
- No. Only one draft is auto-saved, and there's no document list or history. When you finish a draft, export it and keep a copy.
Not sure if Yomu fits your workflow? Ask the AI you already use. We prepared a question that has it read this page and llms.txt first — including what the tool can't do.
Read next
More tools
- Markdown Viewer — Preview .md files instantly. Save as PDF too