ToolVaults

Cron Expression Builder

Pick a preset or enter your own fields to build a cron expression. Includes a plain-English explainer so you know exactly when it will run.

Runs 100% in your browser — nothing is uploaded.

Presets
Fields
Expression
0 9 * * 1-5

Runs at 09:00, Monday through Friday.

Frequently asked

Which cron flavor does this use?

Standard 5-field UNIX cron: minute, hour, day-of-month, month, day-of-week. Cloudflare, GitHub Actions, Kubernetes CronJobs, and most Linux daemons all accept this format.

Does it support the 6-field format (with seconds)?

Not yet — the 5-field standard covers >90% of real usage. A Quartz-flavor variant with seconds is coming in a future update.

Can I paste an existing cron string?

Yes — put it in the URL as ?cron=0+9+*+*+1-5 and the fields will populate. Or type it directly into the 5 field boxes.

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