Top 3 Best Free Online Uml Diagram Tool

Top 3 Best Free Online Uml Diagram Tool

UML stands for Unified Modeling Language which is used in object-oriented software engineering. Following top 3 best free online UML diagram tool are introduced for you to create UML diagram freely and effortlessly.


cacoo uml diagram tool online

Cacoo is the easiest online UML diagram tool with hundreds of UML templates and stencils. You can get started quickly with one of the designs, or customize it to your own. It supports working simultaneously, in real-time with team members to collaborate on your best ideas. Many sharing options are provided. You can even send the completed file as an URL link.

  • Platform: Web-based
  • UML diagrams types supported: use Case diagrams, Sequence diagrams, Class diagrams, Activity diagrams, Package diagrams, etc.
  • Unique feature: its secure cloud service enables you to access your files anywhere – no downloads necessary.


GenMyModel online uml diagram tool

GenMyModel is another free and awesome tool to create UML diagrams, flowcharts online with ease. It generates documentation PDFs on entire diagrams and on each element and exports your models in SVG, PNG, JPEG. Google Drive-style collaboration function navigates in your online centralized model repository, shares your projects with your team workers, edits your UML diagrams in real-time.

  • Platform: Web-based
  • UML diagrams types supported: class diagrams, activity diagrams, use case diagrams, object diagrams, sequence diagrams.
  • Unique feature: it saves major and minor versions of your models to identify which ones you want to deliver. Conserve modifications history.


grapholite online uml diagram tool

Grapholite is an easy to use, touch-friendly, yet a very powerful UML diagram making tool that can be also used for creating flowcharts, floor plans, office layouts, organizational charts, mind maps, Venn charts and more. An intellectual algorithm of connector layout helps you make automatic connections between the diagram elements as neatly as possible. You are able to export your work as the high-resolution bitmap (png, jpeg), pdf, Visio (VDX) or a vector drawing (SVG).

  • Platform: Web-based, Android, iPad
  • UML diagrams types supported: class diagram, component diagram, object diagram, package diagram, composite structure diagram, deployment diagram, activity, use case diagram, sequence diagram, etc.
  • Unique feature: the ability to work in online and offline modes; in and out of the browser.


It is not hard to find there are unique features on each of those 3 UML diagram tool online. Hopefully, you can choose your favorite one and get started.

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