Cron Expression Builder & Explainer

Enter a 5-field cron expression and get a plain-English breakdown plus the next approximate run times. Covers the standard minute/hour/day/month/weekday format used in Unix cron, GitHub Actions and Vercel.

100% freeNo sign-upRuns in your browserNo upload · data stays private

📖 Read the full Cron Expression Builder & Explainer guide — how it works, examples & FAQ →

How to use this tool

  1. Paste a 5-field cron expression.
  2. Read the plain-English explanation.
  3. Check the next run times.

Example

0 3 * * * → "Every day at 3:00 AM UTC"

Why it's private

This tool runs entirely in your browser using JavaScript. Whatever you paste is processed on your own device — it is never uploaded to a server, logged, or stored. Built by Calabi, which also strips AI metadata and C2PA signals from images and video.

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