256 Tools

Cron Expression Builder

Presets
Minute
Hour
Day of month
Month
Day of week
Cron expression
* * * * *

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Build a cron expression without memorizing the syntax. For each field — minute, hour, day of month, month, and day of week — choose every, every N, or a specific value, and the cron string is assembled for you. Presets cover common schedules. Everything runs in your browser.

How to use

  1. Pick a preset, or set each field manually.
  2. Choose every, every N, or a specific value per field.
  3. Copy the generated cron expression.

How it works

A cron expression has five fields: minute, hour, day of month, month, and day of week. 'Every' becomes an asterisk (*), 'every N' becomes a step like */5, and 'specific' passes your value through — including lists like 1,15 or ranges like 1-5. The five tokens are joined with spaces to form the final expression, ready to paste into a crontab or scheduler.

Five fields — minute, hour, day, month, weekday — combine into a cron expression.*****

Features

No syntax needed

Build the expression with simple per-field controls.

Steps & lists

Supports every-N steps and specific values, lists and ranges.

Presets

Start from common schedules like hourly or daily.

Private & instant

The expression is built in your browser; nothing is uploaded.

When to use it

Server jobs

Schedule a crontab entry without looking up syntax.

CI/CD

Create cron schedules for pipelines and actions.

Backups

Set a regular backup or cleanup schedule.

Learning

See how field choices map to cron syntax.

Notes

  • Standard 5-field cron (minute hour day month weekday).
  • Specific values accept lists (1,15) and ranges (1-5).
  • Day-of-month and day-of-week are combined with OR by most cron daemons.
  • Everything runs on your device; nothing is uploaded.

FAQ

What cron format is this?
The standard 5-field format: minute, hour, day of month, month, and day of week.
Can I use lists and ranges?
Yes. In a specific field, enter lists like 1,15 or ranges like 1-5; they pass straight into the expression.
What does every N do?
It creates a step value like */5, meaning every 5 units (for example every 5 minutes).
How do day of month and day of week interact?
Most cron daemons treat them with OR, so the job runs when either matches. Use one and leave the other as *.
Is my data uploaded?
No. The expression is built entirely in your browser and nothing leaves your device.

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