Dev Tools
Cron Expression Explainer
The Cron Expression Explainer takes a standard 5-field cron expression and breaks it down into a plain-English description of exactly when it will run. It saves developers and sysadmins from squinting at asterisks and slashes to figure out whether a scheduled job runs every five minutes or every fifth day of the month.
The parsing and explanation are generated entirely by JavaScript running in your browser, so the cron expression you paste in — even one from a private server's crontab — is never sent anywhere.
How to Use the Cron Expression Explainer
- Open the Cron Expression Explainer tool.
- Paste your 5-field cron expression.
- Read the plain-English explanation of the schedule.
- Adjust the expression and see the explanation update.
Frequently Asked Questions
Does this support the standard 5-field cron format?
Yes, it's built around the standard minute, hour, day-of-month, month, and day-of-week fields used by cron and crontab.
Can it explain expressions using step values and ranges, like */5 or 1-5?
Yes, it interprets step values, ranges, and comma-separated lists in each field to build an accurate plain-English description.
Is my cron expression, which might reveal internal job names or schedules, sent to a server?
No, the explanation is generated entirely in your browser, so the expression you enter never leaves your device.