📝 Plain text
Describe diagrams in a simple, readable language — no binary files, no drag-and-drop.
PlantUML API Server
Diagrams as Code — UML, Cloud Architecture, Kubernetes, C4 and more.
A modern REST API and full editor around the official PlantUML Server. Render to PNG, SVG, TXT or PDF; discover AWS, Azure, Kubernetes, C4, GCP, security and icon libraries; and keep your diagrams as versionable text.
Diagrams as Code
🔀 Version controlled
Diagrams live beside your code. One source of truth, not a stale export.
✅ Reviewed in PRs
A diagram change is a readable diff — proposed, discussed and approved like code.
⚙️ Generated in CI/CD
Regenerate on every build and publish to many formats automatically.
♻️ Reproducible
The same text always produces the same picture, on any machine, forever.
Not just UML
PlantUML draws far more than sequence diagrams. This service exposes it all.
UML
Sequence, class, component, deployment, activity, state, use-case & more.
AWS
Official AWS architecture icons via the modern awslib.
Azure
Microsoft Azure service icons for cloud architecture.
Kubernetes
K8s workloads, services & control-plane with the k8s icon set.
C4 Model
Context, Container, Component & Deployment — architecture as code.
GCP
Google Cloud architecture icons, bundled and INTERNET-safe.
Network & Security
Open Security Architecture (OSA) icons for network/security diagrams.
Icons & Libraries
Material, Office, Logos, Devicons, Font-Awesome, ArchiMate & sprites.
Themes
Restyle any diagram with dozens of built-in themes.
Interactive examples
Live-rendered on this page. Open any in the editor or call the API.
A minimal request/response sequence — the classic PlantUML hello world.
A small AWS architecture using the official awslib icons.
Kubernetes workloads and services using the K8s icon set.
Level-2 C4 container diagram.
Try the API
curl -X POST https://your-host/api/v1/render \
-H 'content-type: application/json' \
-d '{"source":"@startuml\nAlice -> Bob: Hello\n@enduml","format":"svg"}'Full interactive documentation at /docs · schema at /openapi.json.