Best 8 Free Online UML diagram tools in 2020

Last updated on February 26, 2020 by

UML Diagram or Unified Modeling Language Diagram is a collection of diagrams to help you show and visualize a software program. Thus, these diagrams are a combination of activities and sequence of actions that focuses on processes that take place during a specific period of time. Good thing is that we have these free UML diagram tools in 2020 to help you make these amazing diagrams for your convenience.

Best 8 Free Online UML diagram tools


Score: 4.8 / 5

Pricing: Free

UML diagram software

Click the above image to download free templates

GitMind is an awesome online application where you can create UML diagrams for free. Editable templates are also available to help you make UML diagrams fast and easy. Moreover, it has a friendly user interface that displays editing features for hassle-free editing experience.

Visual Paradigm

Score: 4.1 / 5

Pricing: Free; $4 for a starter plan; $9 for advanced

UML diagram creator

Another intuitive and powerful UML diagram software is Visual Paradigm. It also offers free templates to help you save time and effort by just choosing from the given list. Another interesting feature is that it shows you the editing components whenever you hover to the interface.

Violet UML editor

Score: 4.2 / 5

Pricing: Free

UML diagram tools

Violet UML Editor is another UML diagram tool that is very easy to learn and to use. It is also a cross-platform tool intended for students, developers, and authors who need to make UML diagrams quickly. The good thing on this tool is that this is a portable program that you may copy to your flash drive or any device, so you may take it with you whenever you need to create diagrams without installing.

Software Ideas Modeler

Score: 4 / 5

Pricing: Free; starts at $68

UML diagram software

We also have another great UML diagram creator that features easy and fast drawing tools, generating documents such as PDF and RTF, designing and styling options, Source Code Generation like C++, Java, and more. Moreover, depending on the template you’ve selected, you can insert images and any other objects to your diagram by dropping them in the editing area.

UMLet 14.3

Score: 3.8 / 5

Pricing: Free

UML diagram creator

Next, we have UMLet 14.3. This is an open-source built-in application for Windows that will help you make UML Diagrams for free. Its main features include fast and easy making of diagrams from the given templates, allows you to build a sequence and a diagram of your activities from plain texts. Meanwhile, on its exporting feature, it supports eps, pdf, jpg, SVG, and clipboard.

ConceptDraw Diagram

Score: 4.6 / 5

Pricing: Free

UML diagram tools

ConceptDraw Diagram is an excellent UML diagram creator applicable on both Windows and Mac. This awesome tool is well suited for UML diagrams as it offers a number of solutions with vector stencils and templates for any project you need. Another good thing about this tool is that you can use GIF images to have an animated slide on your drawing for technical purposes.


Score: 4.8 / 5

Pricing: Free; $13/ month, $299 for standard, and $589.99 for Professional

UML diagram software

Visio is another tool you may use in creating UML diagrams. It offers templates and modern UI. Thus, this feature can make and bring your diagrams to life with data icons, overlays, graphics, and colors for better visualizations.


Score: 43.7 / 5

Pricing: Free

UML diagram creator

Umbrello UML diagram software allows you to create diagrams in a standard composition to document or design format. It also supports sequence diagrams to help you show the order of the interaction and how the operations are carried out. Moreover, it also supports a number of languages of code generators such as ActionScript, Java, Javascript, Pascal, etc.


These are the best free online UML diagram tools we listed for you. Each tool offers different and unique features for you to choose from. Meanwhile, if you are looking for the easiest and totally free tool, GitMind is the best tool for you.

Rating: 4.8 / 5 (based on 16 ratings) Thanks for your rating!
Posted by: on to Tips and Resources. Last updated on February 26, 2020

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