UML Activity Tool

Activity Diagram Generator

Model workflows and business logic with UML activity diagrams. Describe the actions and branches — ArchGPT draws the parallel flows and decisions.

Generate Activity Diagram

Model Workflows with UML Activity Diagrams

Activity diagrams are the UML way to model workflows and business logic. They show actions, decision points, and parallel or concurrent flows, making them perfect for use cases and process design.

ArchGPT lets you describe the activity in plain English — including words like "in parallel" or "if" — and it builds the diagram with the right forks, joins and decision nodes.

What You Can Model

Business Workflows

Model approval chains, onboarding and multi-step business operations.

Parallel Processing

Show actions that happen concurrently using forks and joins.

Use Case Flows

Detail the main and alternative flows behind any use case.

Complex Logic

Capture rules, branches and loops that are hard to explain in words.

How It Works

  1. Describe the workflow — list the actions and where the flow branches or merges.
  2. ArchGPT structures it — our AI identifies activities, decisions and concurrency.
  3. Get your diagram — a UML activity diagram renders in seconds.
  4. Export or edit — download it, or refine forks and joins in the Draw.io editor.

Try a prompt: "An order is placed. In parallel, the payment is authorized and inventory is checked. If both succeed, ship the order. Otherwise, cancel the order and notify the customer."

Why ArchGPT?
  • Generate from plain text — no syntax
  • No signup or credit card required
  • Export as PNG, JPEG, SVG or PDF
  • Edit in the built-in Draw.io editor
  • AI explanation for every diagram
Start Generating
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Frequently Asked Questions

Everything you need to know about generating activity diagrams.

An activity diagram is the UML standard and supports concurrency with forks and joins, while a flowchart focuses on simple sequential steps.

Yes. Use phrases like in parallel or concurrently and ArchGPT draws forks and joins.

Yes — activity diagram generation is free with no signup required.

ArchGPT

AI-powered diagram generation for developers and architects. Create professional UML and architecture diagrams in seconds.

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