UMLet is a free, open-source UML tool with a simple user interface: draw UML diagrams fast, build sequence and activity diagrams from plain text, export diagrams to eps, pdf, jpg, svg, and clipboard, share diagrams using Eclipse, and create new, custom UML elements. UMLet runs stand-alone or as Eclipse plug-in on Windows, OS X and Linux.

Below the original, full-featured tool -- but also check out our UMLet Visual Studio Code extension on the VS Code Marketplace, our web-based UMLet called UMLetino, and our other tools. Or visit us on Facebook!

  • New in 15.0: Web: zoom, lasso, export, dark mode; hi-res export; startup...
  • New in 14.3: Improved OS and Eclipse integration (thx @ruediste); XML security fix
  • New in 14.2: Fixed pixel displacements; improved relations; embeddable pdf fonts

If you like UMLet, please star us on the VS Code Marketplace or the Eclipse Marketplace! (You can also sponsor UMLet via Github, Patreon, or Paypal. Obliged!)