Cron Helper
The Cron Expression Helper decodes the standard 5-field cron syntax (minute hour day-of-month month day-of-week) used by Linux crontab, GitHub Actions, AWS EventBridge, and many job schedulers. Enter your expression and the tool lists every value matching each field, plus shows the next five execution times projected in your local timezone. The parser supports wildcards (*), lists (a,b), ranges (a-b), and step values (a-b/n). Useful for validating scheduling logic before deploying jobs or understanding inherited cron entries.
How to Use
To use the Cron Helper, simply open the tool page and interact with the controls in the panel above. The interactive panel handles input and produces instant results entirely in your browser — no signup, no upload. Use the Copy button when you want to transfer the output to your clipboard.
Key Features
- Runs in your browser — No data uploads or server roundtrips.
- Free & no signup — Use without registration or limits.
- Privacy first — Your input never leaves your device.
- Instant results — All processing is synchronous and local.
- Copy & download — Copy output or download to a file when supported.
Common Use Cases
This tool is useful for developers, designers, testers, students, and anyone who needs a quick, browser-based utility without installing software.
Tips & Tricks
Bookmark the tool for quick access during your workflow. Combine it with the related tools listed below for end-to-end productivity.
Frequently Asked Questions
Does it support 6 or 7-field cron?
Currently only the classic 5-field cron is supported. 6-field cron (with seconds) or quartz cron is not yet parsed.
How far in advance are runs previewed?
The next 5 future runs, regardless of distance. It caps at 100 000 iterations to prevent infinite loops on impossible patterns.
What is the day-of-week numbering?
0 = Sunday, 1 = Monday, ..., 6 = Saturday. Some systems also allow 7 for Sunday; this tool uses 0.
Why does my pattern return nothing?
Check that all five fields include values valid for today forward, e.g. specifying month=2 will not match until next February.
Are @reboot and @daily shortcuts supported?
No. Only the standard numeric cron syntax is parsed.