Need a web-based sequence diagram editor for free?

As a top-rated diagramming tool, Visual Paradigm Online incorporates an intuitive drag-and-drop sequence diagram editor that allows you to create professional software design quickly and easily. Visual Paradigm Online also offers hundreds of diagram templates and templates for you to create your own UML diagrams in quick. The Free Edition of Visual Paradigm Online is free for non commercial use and support UML, ERD, Org. Chart and Floor Plan maker.

Make a Sequence Diagram

Create fantastic sequence diagrams

Free UML Editor

Create as many UML diagrams as you like. Output your work as images (PNG/JPG/GIF/SVG) or PDF. Enjoy!

Unlimited number of diagrams and shapes
Unlimited period of access
No ads.

Fast Diagramming

Create professional sequence diagrams with our intuitive online UML tool. Some of the editing features:

Drag to create and connect shapes
Well attached connectors (no separate apart)
Replicate shape format in one click
Reuse shapes in diagrams
Hundreds of diagram examples & templates

Better Results

A full set of professional diagram tools are ready to support you in creating high quality sequence diagrams:

Accurate shape positioning with alignment guide
Include external images, URLs and text in diagrams
Wide range of formatting options
Easily rotatable shapes
Group, align and distribute shapes
Build an item list for instant shape formation

Key features and benefits

Unlimited period of access
Unlimited number of diagrams
Unlimited number of shapes
UML Tool, ER Diagram Tool, Organization Chart Maker, Floor Plan Designer, ITIL, Business Concept Diagram
Can be upgraded to paid editions for more diagram types and features
Cross-platform: Windows, Mac, Linux. Compatible with all web browsers
Easy to use: Create and connect shapes with drag and drop. Connectors will snap to shapes and never separate apart.
Apply different formatting options (shape and lines, solid and gradient paint), 40+ connector types, RTF caption, font options, shadow effect, etc
Draw your own diagrams with your own shapes.
Visio drawing and stencil import
Get start quickly with hundreds of diagram examples and diagram templates
Print, export and share your work in different formats (PNG, JPG, SVG, GIF, PDF)
Easily embed text, external images and web links to diagram
Save diagrams in Google Drive

But don't take our word for it

Try it yourself. Just browse the Sequence Diagram examples below and click Open Diagram to open and edit. You will see for yourself that it is everything we say it is, or perhaps more.