Chrome extension for viewing PlantUML diagrams.
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Renders UML diagram as defined in a text file. For full syntax, see:

  1. Install the extension from Chrome Web Store.
  2. Check "Allow access to file URLs" in chrome://extensions/.
  3. Open local or remote text file with UML diagram definition in browser (the text starts with @startuml).
  4. See the rendered UML diagram!


  • Automatically updates the diagram when the local file is changed.
  • You can use your own server by changing the server URL in the popup of the action button (action button is displayed while viewing PlantUML files).


This extension does not require any permissions.


Credits go to Arnaud Roques, the author of the PlantUML. If you like this plugin, support the original author via the PayPal button on the PlantUML site (