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C4 Diagram Maker

Draft C4-style context and container views for architecture talks. Start from the template, keep one level of detail per diagram, then export for the meeting.

Features

  • Live editor for c4 diagram maker
  • Starter template included on the page
  • PNG and SVG export
  • No install required

Need a blank canvas? Open the full UML studio.

What you can model

C4-style diagrams tell an architecture story in levels. Context shows people and systems. Containers show applications and data stores. Components and code go deeper. This maker is for clear sketches, not a full C4 suite replacement.

How to use this maker

Name people and systems, label relationships with purpose, preview, then export. For service-mesh detail, continue on the microservices diagram maker.

Notation that matters

People and software systems are primary boxes at context level. Relationship labels should state why the link exists. Do not mix context and container detail on one canvas.

Keep the diagram readable

If you need UML deployment or component views without C4 vocabulary, open those makers. Keep each diagram at one C4 level so stakeholders are not lost between zoom levels.

Frequently asked questions

Is this C4 diagram maker free?

Yes. Create and export online without a subscription.

Is this a full C4 modeling suite?

It is a lightweight PlantUML-based starter for C4-style views, not a full C4 Studio replacement.

C4 or microservices diagram?

Use C4 for leveled architecture storytelling. Use the microservices page when service boundaries and dependencies are the main question.

Related tools

Browse the full UML diagram tools directory or return to the UML diagram hub.