📊
📖
Add a Diagram to a README
Create diagrams GitHub renders natively in your README.
ログイン不要
Preview
Start typing to see your diagram…
💡 Write diagrams in Mermaid syntax — flowcharts, sequence diagrams, Gantt charts, class diagrams, and more — and export as SVG or PNG. Rendering happens entirely in your browser; nothing is uploaded.
GitHub tips
📖
GitHub renders Mermaid in Markdown — paste your code in a ```mermaid block and it shows inline.
🔧
Use this editor to get the syntax right with a live preview before committing.
🖼️
If you need an image instead, export SVG or PNG here.
🔒
Everything runs in your browser.
使い方
1
入力
Enter your data into the tool above. Everything stays local to your browser.
2
処理
The tool processes your data instantly in your browser using JavaScript. No server, no waiting.
3
ダウンロード
Get your result instantly. Nothing is stored after you leave the page — complete privacy.
なぜ私たちのツール？
✓完全に無料 — 隠れたコストは永遠にありません
✓アカウント、メール、ログイン不要
✓ファイルがデバイスを離れることはありません
✓ファイルサイズの制限は一切ありません
✓出力に透かしなし