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Kroki

Diagrams from text — health and metadata JSON

🔧 Developer ToolsHEALTHYchecked 10h ago
AUTH NONECORS ✓AGENT ✓HTTPS ✓COMMERCIAL ?

Renders Mermaid, PlantUML and more to images. The /health route returns service status as JSON; diagram POST routes return binary media.

92HOW IT'S SCORED ⓘ
▶ Run liveDocs ↗
Status badge · for your READMEshipapis health badge: 92 · healthy
Uptime history
100%90 days
100%30 days
633P50 · ms
3183P95 · ms
operationalpartialdownno data
Response time · last 48 checks
Fastest 54 ms, slowest 2104 ms, most recent 84 ms.
Live response samplecaptured by our last successful check
GET https://kroki.io/health

{
  "version": {
    "actdiag": "3.3.0",
    "bpmn": "18.18.0",
    "pikchr": "7269f78c4a",
    "nwdiag": "3.3.0",
    "c4plantuml": "1.2026.6",
    "rackdiag": "3.3.0",
    "dot": "14.1.3",
    "symbolator": "1.2.2"
  },
  "status": "pass"
}
Call itcurl · fetch · python
curl "https://kroki.io/health"
const res = await fetch("https://kroki.io/health");
const data = await res.json();
console.log(data);
import requests

res = requests.get("https://kroki.io/health")
print(res.json())
Endpoints · 4HealthyFULL DOCS ↗
Monitored path responding — GET /health633 mschecked 10h ago
GET/healthPROBED

Diagrams from text — health and metadata JSON

GET/ping

Lightweight ping endpoint.

GET/status

Service status metadata.

GET/graphviz/svg/eNpLyUwvSizIUHBXqPZIzcnJ17ULzy_KSanlAgB1EAjQ

ENpLyUwvSizIUHBXqPZIzcnJ17ULzy KSanlAgB1EAjQ — documented GET route.

Machine-readable spec

We probe a documented GET and expect 2xx JSON — full uptime and health score. Export includes every documented route below.

Response-shape history

Stable. No schema drift observed since monitoring began — the response shape has not changed under our checks.

Kroki: common questions

Is Kroki free to use?

Yes — Kroki is a free developer tools API. Free tier: Free — limits not published. Whether the free tier allows commercial use is unclear — check the provider docs.

Does Kroki need an API key?

No — Kroki needs no API key or signup. You can call it straight away; rate limits still apply (Unpublished).

Can I call Kroki from the browser?

Yes — Kroki returns CORS headers over HTTPS, so front-end code can fetch it directly with no backend proxy. Use the fetch snippet on this page, or hit "Run live" to try it now.

Is Kroki up right now?

As of our last scheduled check, Kroki is healthy with 100% uptime over 90 days and a 633 ms median response. We re-probe it every sweep — the status badge and uptime chart above always show the latest.