Editor
Preview
A free, open-source Mermaid diagram editor
freemermaid lets you write Mermaid diagram syntax and see a live preview. Save, export, print, and zoom your diagrams — all in the browser, no account needed.
freemermaid was built from the ground up to be free. Tools like this shouldn't cost money, and there will never be a charge to use it.
If you're currently paying for a diagramming or developer tool that you think should be free, let me know using the form below and I'll see if I can build a free alternative.