Convert MERMAID to PNG, Free
Files convert instantly in your browser. 100% private, any file size, no account needed.
Drop your MERMAID file here
or click to browse. Any file size.
Conversion runs entirely in your browser. Your file never leaves your device.
How to convert MERMAID to PNG
Mermaid is a text-based diagramming language that lets you create flowcharts, sequence diagrams, class diagrams, Gantt charts, and other diagrams by writing simple text syntax. It is built into GitHub, GitLab, Notion, and many other tools. When you need to export a Mermaid diagram as an image for a presentation, document, or report, converting to PNG is the standard approach.
BoltConverter renders Mermaid diagrams to PNG entirely in your browser using the Mermaid.js library. Paste your Mermaid code and get a PNG immediately, no account or server upload required.
Paste your Mermaid code
Paste your Mermaid diagram syntax (e.g., graph TD; A-->B;) into the input area.
Diagram renders in your browser
BoltConverter uses Mermaid.js to render the diagram locally. No upload to a server.
Preview the diagram
The rendered PNG preview appears. Check that the layout looks correct.
Download the PNG
Click Download to save the PNG. Use it in any document or presentation.
Frequently asked questions
Which Mermaid diagram types are supported?
Flowcharts, sequence diagrams, class diagrams, state diagrams, entity relationship diagrams, Gantt charts, pie charts, and Git graphs are all supported. The exact set matches the current Mermaid.js release.
What if my diagram has a syntax error?
If the Mermaid syntax is invalid, the converter will display an error message from Mermaid.js indicating where the problem is.
Can I control the size of the output PNG?
The output size is determined by the diagram content and Mermaid's default layout. Very wide or tall diagrams may produce large PNGs.
Is there a background color?
The default output uses a white background. Mermaid's theme settings in your diagram code (using init directives) can adjust colors.
Is my diagram code kept private?
Yes. The entire conversion runs in your browser using Mermaid.js via WebAssembly. Nothing is sent to a server.