Mermaid Diagram Editor
Edit Mermaid source and preview SVG locally with a self-hosted Mermaid build.
Interactive controls load with JavaScript. Processing stays in your browser.
Chargement…
How to use
- 在输入区编写 Mermaid 源码（flowchart、sequenceDiagram、classDiagram 等）。
- 实时或点击处理后在下方预览 SVG；主题可跟随站点或强制亮/暗。
- 复制按钮复制源码；下载按钮导出 SVG。
- Mermaid 库仅在本工具页通过自托管 /assets/vendor/mermaid.min.js 加载（约 2.5MB），不请求第三方 CDN，源码不上传。
FAQ
Does Mermaid Diagram Editor upload my data?
No. Mermaid Diagram Editor runs locally in your browser and does not upload content to www.518882.com or third-party APIs.
Do I need an account?
No. Open and use — no signup, login, or paywall. Open Mermaid Diagram Editor and use it — no signup, login, or paywall.
How is this different from upload-based tools?
Tools run locally in your browser; content is not sent to our servers for processing — suited to private text and drafts.
Are there limits?
Limited by device memory and the browser; very large inputs may slow the page. There is no account quota.