FREE · OPEN SOURCE · LOCAL ONLY

Catch YAML that parses locally but breaks GitHub Actions.

Find invalid Actions permissions, strict syntax errors, and duplicate keys before a workflow silently stops. Your YAML never leaves this browser.

Paste YAML

Up to 100 KB. No upload, account, cookie, or analytics.

Quick demo: this YAML parses, but workflows: write is not a valid GitHub Actions permission.

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Built by aevumere. Parsing happens locally; this static app contains no telemetry and sends no document data anywhere.