New Update: PlantUML diagrams that never leave your browser
A free PlantUML editor that runs entirely in your browser. The official engine is compiled to JavaScript, so your diagram source is never uploaded. Live preview, PNG/SVG export, templates, share links and offline support. No account, no Java, no Graphviz.
Explore at https://localonly.dev/plantuml/
What you get:
Live preview that updates as you type
Share links that carry the diagram compressed in the URL, with optional password encryption - Unique feature
A real code editor (Monaco, the one inside VS Code) with syntax highlighting, find and replace, undo/redo
Copy the code or the rendered image in one click, straight into a PR or a ticket
Export PNG, SVG, or the .puml source
Zoom, pan, fit to screen and fullscreen, because architecture diagrams get big
A Format button, plus a checker that catches unclosed alt/loop blocks and a missing @enduml
~28 templates: sequence, class, activity, state, component, C4, ER, mind map, Gantt and more
Works offline once loaded, installs as a PWA
Free, no account, no limits
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