NNWS Tools

Cron Builder

Build and explain cron expressions.

Runs on your device
Minute
0-59
Hour
0-23
Day (month)
1-31
Month
1-12
Day (week)
0-6
* * * * *
Runs every minute.
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Developers tools

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About Cron Builder

Cron Builder is a free, private developers tool that lets you build and explain cron expressions. Like every tool on NWS Tools, it runs entirely in your browser — nothing is uploaded, there are no accounts, and there's no tracking. Just open it and go.

Frequently asked questions

Is Cron Builder free to use?
Yes. Cron Builder is completely free, with no account, sign-up or limits.
Are my files or data uploaded anywhere?
No. Cron Builder runs entirely in your browser. Your files, text and numbers are processed on your own device and are never uploaded to a server.
Does Cron Builder work offline?
Once the page has loaded, most tools keep working with no internet connection. NWS Tools is a Progressive Web App you can even install.
Do I need to install any software?
No installation is required — Cron Builder works instantly in any modern browser on desktop or mobile.