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Free UML Tool for Fast UML Diagrams

UMLet is a free, open-source UML tool with a simple user interface: draw UML diagrams fast, create sequence and activity diagrams from plain text, share via exports to eps, pdf, jpg, svg, and clipboard, and develop new, custom UML elements.

Find below the full-featured UMLet as stand-alone app for Windows, macOS, and Linux, or as Eclipse plugin. It is also available as web app called UMLetino, and as extension to Visual Studio Code.

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github.com/umlet             @twumlet


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New in 15.1: Relation bug fix ++ log lib update ++ dark mode cleanup..
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..



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

Main


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Tutorial


Quickstart

  • Add elements to a UML diagram with a double click
  • Edit elements using the lower-right text panel
  • Use Ctrl+Space for context-sensitive help
  • Select multiple elements using Ctrl or lasso
  • Press 'C' to copy diagram to the system clipboard
  • Use +/- or Ctrl+mousewheel to zoom
  • Press Shift to avoid sticking relations!


Background


Red_arrow_and_circle_green_screen_21st_century_... Apr 2026

By morning, the video had ten million views. The comments were a frenzy of people debating the "secret energy" in the water, even though it was just tap water.

In the digital heart of the 21st century, there lived a content creator named Leo. Leo didn’t make movies or write books; he made "Discovery Logs." His life was a series of neon-lit rooms and massive monitors, but he had a problem: nobody was watching.

Here is a story that explores the 21st-century obsession with these symbols: The Boy Who Found the Red Arrow red_arrow_and_circle_green_screen_21st_century_...

One day, while editing a mundane video of himself eating a sandwich, Leo found a glitch in his software—a bright, vibrating . No matter where he moved it on his screen, it seemed to pulse with a life of its own. Just for fun, he placed the arrow pointing at a plain glass of water and added a jagged Red Circle around the rim. He set the background to a bright Green Screen and replaced it with a photo of a swirling, ominous storm.

Leo realized the symbols were magic. He spent months chasing the Arrow. He pointed it at empty park benches, stray cats, and cracks in the sidewalk. He became the most famous man on the internet by circling nothing at all. He lived entirely in front of his , digitally transporting himself to Mars, the deep ocean, or ancient Rome, all while never leaving his swivel chair. By morning, the video had ten million views

But the 21st century is fast. One day, the Red Arrow stopped pulsing. It turned a dull grey. No matter how many circles Leo drew or how many neon backgrounds he keyed into his green screen, the viewers had grown bored. They had seen a thousand arrows and a million circles.

Leo finally stepped outside, away from the monitors. He looked up at the sky—a real, unedited blue. He realized that for years, he had been pointing at everything and seeing nothing. He didn't need a red arrow to tell him where to look anymore; he just needed to open his eyes. Leo didn’t make movies or write books; he

He titled the video: "YOU WON’T BELIEVE WHAT HAPPENED TO THIS WATER! (SHOCKING!!)"


Support


You can support this UML tool by linking to this site; by sending us feedback, bug reports, or blurbs we can quote; by giving us a star on the the VS Code Marketplace or the Eclipse Marketplace; by spreading the word on social media; or via Github Sponsors, Patreon, or Paypal. Thank you - any support is truly appreciated!



2001+ :: GNU GPL 3.0