Free Mermaid to PNG Converter
Paste Mermaid code, see the diagram, export a PNG. This mermaid to PNG converter renders everything locally in your browser — no upload, no signup, no watermark — and hands you a crisp image at 1x, 2x or 3x with a transparent, white or dark background.
Mermaid to PNG Converter
A mermaid to PNG converter does one job well: it turns diagram code into an image you can drop anywhere. Paste flowcharts, sequence diagrams, ER diagrams or Gantt charts on the left and the rendered diagram appears on the right, on a checkerboard backdrop that shows exactly how the transparency will look.
When it looks right, pick a scale and a background and hit Download PNG. The file is named and sized for you, ready for slides, docs or tickets. The whole mermaid to PNG round trip takes about ten seconds, and nothing you paste ever leaves this tab.
Export Options: Resolution, Transparency and Dark Theme
Resolution is about where the image lands. Use 1x for in-document embedding, where the PNG sits inside text and doesn't need extra pixels. Use 2x for slides and presentations — it's the default because projectors and retina screens punish soft edges. Use 3x for print or large displays, where every line has to stay razor sharp at arm's length.
Background choice matters just as much. A transparent background keeps the alpha channel, so the diagram sits cleanly on dark slides or colored layouts without a white box around it. White is the safe default for documents and wikis. Dark theme flips the palette to a deep slate background for decks that run in dark mode — a mermaid to PNG export that matches the room, not just the file.
How to Convert Mermaid Code to PNG
1. Paste your Mermaid code
The fastest path is the editor: paste flowchart, sequence, class or ER syntax and the preview renders as you type. You can also drop a .md file onto the page — the converter finds every ```mermaid block inside and renders them all. The example loads on arrival, so you can see the mermaid to PNG flow before pasting anything.
2. Check the diagram preview
The diagram appears on a checkerboard background, so transparency is visible instead of guessed. Syntax errors don't break the page: the problem block shows an error note with the line number while the rest of your diagrams keep rendering.
3. Export the PNG
Choose 1x, 2x or 3x, pick transparent, white or dark, and download. Working with a large diagram of 80 lines or more? Go straight to 3x — the mermaid to PNG export rasterizes at exact pixel size, so fine labels stay readable when you zoom.
Why Export Diagrams as Images
Images travel better than code. A Mermaid diagram is perfect inside your editor, but your slide deck, your wiki, and your project manager all prefer a plain image. Exporting to PNG is how a diagram leaves the toolchain and enters the conversation.
This mermaid to PNG converter keeps the trip private: rendering happens entirely in your browser, with no server round trip and no account. Your theme survives too — colors, fonts and line styles from your Mermaid code are preserved in the export. And because there's no upload step, there's no copy of your architecture sketch sitting on someone else's infrastructure.
PNG vs SVG vs PDF: Which Format to Choose
PNG, SVG and PDF aren't rivals — they're assignments. PNG is the universal drop-in: slides, documents, tickets, chat, social posts. Every tool on earth opens it, and a 2x or 3x export stays sharp on modern screens.
SVG is the better choice for the web. It's vector, so it scales without losing clarity, and it stays tiny in file size for simple diagrams. If your destination is a webpage you control, embed SVG. PDF is the archivist: it packages one or many diagrams with text into a fixed-layout document for printing and records — that's what our sister page Mermaid to PDF Converter does. For everything else, mermaid to PNG is the default answer.
Frequently Asked Questions
Is this Mermaid to PNG converter free?
Yes. The converter is free to use with no signup, no watermark and no export limit.
Are my diagrams uploaded to a server?
No. The diagram is rendered entirely in your browser. Your code never leaves your device.
Which resolution should I choose?
Use 1x for in-document embedding, 2x for slides and presentations, and 3x for print or large displays.
Can I export a diagram with a transparent background?
Yes. Turn on the transparent background option and the exported PNG will have an alpha channel, which is useful for dark slides.
Does the export keep my diagram theme?
Yes. Colors, fonts and line styles defined in your Mermaid code are preserved in the PNG.
What if my diagram is too large to export?
Very large diagrams at 3x can exceed the browser canvas limit. If the export times out, lower the scale to 2x or 1x.