Free tool
Mermaid live editor
Paste Mermaid syntax from Claude, ChatGPT, or your own notes, and watch the diagram render as you type. Then copy the SVG or publish it as a shareable page.
A Mermaid live editor is an online tool that renders Mermaid’s text-based diagram syntax into a visual diagram as you type. Paste a flowchart, sequence diagram, or Gantt chart definition into the editor and the preview updates instantly. No install, no account, no build step.
Loading the Mermaid renderer…
For AI output
A Mermaid online editor for the diagrams your AI writes
How it works
Mermaid live editor: from syntax to a shareable diagram
Paste your Mermaid syntax
Drop in the diagram code your AI assistant produced: a flowchart, sequence diagram, Gantt chart, or any other Mermaid type. The preview renders as you type.
Fix what the parser flags
If a line breaks the diagram, the parse error appears inline while your last good render stays on screen. Adjust the syntax and the preview catches up in real time.
Copy, download, or publish
Copy the SVG to your clipboard, download it as a file, or publish the diagram as a page you can share. A clean link instead of a screenshot.
The next step
Turn the diagram into a page people can open
A link, not a screenshot
Publish the diagram as a page on a Pagelive link. It stays sharp at any zoom, and you can update it without re-sending anything.
Private by default
Published pages are noindex by default, and on Solo and Team you can add a password (encrypted so we can’t see it) when the diagram describes something confidential.
See who actually looked
Every page counts its views. Solo and Team add unique viewers, country, and time on page. Useful when the diagram is part of a proposal or architecture review.
More free tools
Other ways to preview and ship what AI builds
Online SVG viewer
Check the diagram SVG you downloaded, or any SVG code, with real dimensions and zoom.
Open the SVG viewer →Markdown viewer
Preview Markdown, including docs your AI wrote, rendered cleanly in the browser.
Open the tool →HTML to website
Turn a single HTML file into a live website on a clean, shareable link.
Open the tool →Mermaid live editor FAQ
Mermaid is a text-based diagramming language: you describe a flowchart, sequence diagram, Gantt chart, or class diagram in plain text, and a renderer turns it into a visual diagram. Because it’s just text, AI assistants like Claude and ChatGPT generate it constantly. This editor turns that text into the actual picture.
mermaid.live is the official Mermaid live editor from the Mermaid project, with more options for configuring and styling diagrams. This editor renders with the same open-source Mermaid library (version 11), so the same syntax gives the same diagram. The difference is what comes next: publish the diagram as a page on its own Pagelive link, noindex by default and with a view count, instead of sending a screenshot.
Yes. Paste and render as many diagrams as you like, with no signup. The diagram is drawn in your browser, so your Mermaid code is not uploaded. Publishing a diagram as a link is free too, and a free account keeps 2 public pages live.
Almost always a syntax error. Common culprits: a missing diagram type on the first line (e.g. flowchart TD), special characters like parentheses or brackets inside an unquoted node label (wrap the label in double quotes), or a malformed arrow. The editor shows the parser’s message inline: fix the flagged line and the preview updates within a moment.
Yes. Download the SVG from this editor and embed it in any document, slide, or site like a normal image. It scales without losing sharpness. If you want a living version, publish the diagram as a Pagelive page and link to it; update the page later and every existing link shows the new diagram.
Two ways. For a static copy, download the SVG and attach it. For a link, publish it with Pagelive: the diagram becomes a page on a clean Pagelive URL that’s noindex by default, with a view count. A free account keeps 2 public pages live; Solo adds passwords and time on page.