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Cron Expression Humanizer

Type any cron expression and read what it means in plain English — instantly, as you type.

Tool input is processed locally in your browser and is not submitted to CodeNimbleTools. Avoid pasting production secrets into any device or website you do not fully trust.

In plain English

Type a cron expression above — the human-readable meaning appears here instantly.

About this tool

Cron syntax is compact to write and cruel to read. This humanizer parses standard 5-field expressions — plus @daily-style shortcuts, names like MON and JAN, ranges, lists and steps — and renders an accurate plain-English sentence as you type.

It also breaks the expression into its five fields so you can see exactly which part says what.

How to use it

  1. Type or paste a cron expression, e.g. */15 9-17 * * MON-FRI.
  2. Read the English translation instantly.
  3. Check the field table if something looks off.
  4. Try Load example for a realistic starting point.

Useful ways to apply it

  • Reviewing crontabs during server maintenance.
  • Double-checking a schedule before deploying a CI job.
  • Learning cron syntax by experimenting live.
  • Explaining an existing schedule to teammates in tickets.

Worked example

Example input

*/15 9-17 * * 1-5

Expected output

Every 15 minutes during 09:00–17:59, Monday through Friday, subject to the target cron implementation

Edge cases to check

  • Cron dialects differ; Unix cron, Quartz and cloud schedulers are not interchangeable.
  • Day-of-month and day-of-week semantics can surprise users.
  • Time-zone behavior belongs to the scheduler environment, not the expression alone.

Known limitations

The description targets supported five-field cron syntax. Verify special tokens and semantics against the scheduler you deploy.

How this tool was reviewed

Reviewed with wildcards, lists, ranges, steps and weekday schedules.

Last reviewed: September 3, 2026 · Maintainer: William

Standards and technical references

See the site-wide testing methodology for fixture categories, privacy checks and correction policy.

Frequently asked questions

Which syntax is supported?
Standard 5-field cron: numbers, * wildcards, ranges (1-5), lists (1,3,5), steps (*/15, 1-30/5), month/day names, and @yearly/@monthly/@weekly/@daily/@hourly aliases.
How are day-of-month AND day-of-week handled together?
Per POSIX cron, when both are restricted the job runs when either matches (OR logic) — the translation says so explicitly, since this surprises almost everyone.
Are seconds fields supported?
No — 6-field (Quartz-style) expressions are rejected with a clear message, since their semantics differ.

Privacy

Tool input is processed locally in your browser and is not submitted to CodeNimbleTools. Avoid pasting production secrets into any device or website you do not fully trust.