OomTools

Cron Expression Generator

Build a valid cron schedule from common presets or by editing each field directly, with a plain-English description updating as you go so you know exactly when it'll fire. It's all computed in your browser.

  • 100% free
  • Private & safe
  • Runs in your browser

Why use Cron Expression Generator?

Cron Expression Generator is a quick, no-nonsense developer utility that runs entirely client-side, so your code and data never leave your machine.

  • Runs instantly in your browser — nothing to install, nothing uploaded.
  • Completely free, with no account, no watermarks and no usage limits.
  • Handles Five fields: minute hour day-of-month month day-of-week; Supports *, */n, ranges and lists.
  • Pick a preset, or edit the five cron fields directly.
  • Works on any device — desktop, tablet and phone — and is fully keyboard accessible.

What it can do — and its limits

  • Builds and explains cron expressions in plain English.
  • Covers the standard five fields: minute, hour, day-of-month, month and day-of-week.
  • Generated in your browser.

How to use Cron Expression Generator

  1. Pick a preset, or edit the five cron fields directly.
  2. Read the live plain-English description of the schedule.
  3. Confirm the expression is valid.
  4. Copy it into your crontab or scheduler.

Examples

  • Building '0 9 * * 1-5' for weekdays at 9am.
  • Creating an every-5-minutes schedule.

Worked example

Input

0 9 * * 1-5

Output

At 09:00, Monday through Friday.

Supported formats & limits

  • Five fields: minute hour day-of-month month day-of-week
  • Supports *, */n, ranges and lists

Limitations

  • Standard 5-field cron; some schedulers add a seconds field or special strings.
  • Describes the schedule but does not compute exact next-run timestamps.

Common problems & fixes

Five vs six fields.

Classic cron has five fields; some schedulers add a leading seconds field. Match your platform.

Both day-of-month and day-of-week set.

In standard cron these are OR-ed, which can fire more often than you expect — leave one as *.

Sources & references

Last verified August 2026.

Frequently asked questions

Which cron format is this?

The standard five-field format: minute, hour, day-of-month, month, day-of-week.

Does it show the next run time?

It gives a plain-English description; exact next-run depends on your scheduler's timezone.

Is anything uploaded?

No — it runs in your browser.

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