Add a Diagram to a README

Create diagrams GitHub renders natively in your README.

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Diagram code

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.

工作原理

输入

Enter your data into the tool above. Everything stays local to your browser.

处理

The tool processes your data instantly in your browser using JavaScript. No server, no waiting.

下载

Get your result instantly. Nothing is stored after you leave the page — complete privacy.

为什么选择我们的？

✓完全免费——永远没有隐藏费用

✓无需账号、邮箱或登录

✓文件永远不会离开你的设备

✓绝无文件大小限制

✓所有输出均无水印

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🔀

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↔️

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📆

Build a Gantt Chart

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🧱

Create a Class Diagram

Diagram classes and their relationships for softwa

常见问题

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