⏰ Cron Expression Explainer
Paste any 5-field or 6-field cron expression and get an instant plain-English explanation plus the next 5 scheduled run times — completely free and runs entirely in your browser with no data sent anywhere.
Cron Expression
Plain-Language Explanation
Next 5 Run Times
About
The Cron Expression Explainer parses standard 5-field cron syntax (minute, hour, day-of-month, month, day-of-week) as well as 6-field expressions with a seconds field, supporting wildcards, ranges, lists, and step values. It calculates the next 5 actual run timestamps based on your local clock so you can immediately verify your schedule is correct. Everything runs offline in your browser — your cron expressions never leave your device, making it safe to use with sensitive automation schedules.
How to use
- Type or paste your cron expression into the input field (e.g. `0 9 * * 1-5`).
- Read the plain-language summary that appears instantly below — it describes exactly when the job will run.
- Check the per-field breakdown table to see what each part of the expression means.
- Review the next 5 run times (in your local timezone) to confirm the schedule is what you expect.
- Click Copy to copy all 5 timestamps to your clipboard, or try one of the quick example expressions.
FAQ
- Is this tool free to use?
- Yes, completely free. There are no limits, no plans, and no account required. Just open the page and start decoding.
- Does my cron expression get uploaded to a server?
- No. All parsing and calculation happens entirely in your browser using JavaScript. Nothing is ever sent to any server, so your automation schedules stay private.
- Does it work offline or without an internet connection?
- Yes. Once the page has loaded, the tool works fully offline. There are no external API calls, CDN dependencies, or network requests of any kind.
- What cron syntax is supported?
- Standard 5-field cron (minute hour day-of-month month day-of-week) and 6-field cron with a leading seconds field. Supported tokens include wildcards (*), ranges (1-5), lists (1,3,5), and step values (*/15, 0-30/5).
- Are the next run times calculated in my local timezone?
- Yes. The next 5 run times are calculated using your browser's local clock and timezone, so the timestamps you see match exactly what your system scheduler would trigger.