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Cron expression helper. Schedules in plain English.

Type any 5-field cron expression and get an instant plain-English translation, per-field validation and the next five run times in your local timezone, parsed entirely in your browser, nothing uploaded.

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A free online tool by Digital Heroes
in plain english
…

Everything is parsed and computed locally in this browser, nothing is uploaded.

Field-by-field breakdown

    Next 5 run times

      Computed locally in your timezone (). Nothing is uploaded.

      Cron, decoded

      A cron expression is five space-separated fields, minute, hour, day-of-month, month, day-of-week, and each accepts numbers, names (jan, mon), ranges (1-5), lists (1,15) and steps (*/5). Both 0 and 7 mean Sunday, and when both day fields are restricted the classic Vixie-cron rule applies: the job fires when either matches. This helper validates each field with a specific error message, translates the whole schedule into a sentence you can sanity-check, and walks the calendar forward to show the next five real fire times in your timezone. No account, nothing uploaded, free forever.

      § 02 · what you can do

      Everything a cron helper should do.

      Translate to plain EnglishInstantly turn any 5-field expression into a sentence, so you can confirm a schedule is correct at a glance.
      Validate all 5 fieldsMinute, hour, day-of-month, month and day-of-week each get checked, with a specific message telling you exactly where the syntax error is.
      Preview the next 5 runsSee upcoming fire times in your local timezone, with relative labels like “in 3h” or “in 2d”.
      Start from presetsTwelve one-click schedules, every 5 minutes, weekdays 9am, monthly 1st, quarterly, yearly and more.
      Read the breakdownA field-by-field explanation shows what every token means in human terms, ranges, lists, steps and names included.
      Private by constructionParsing and run-time math happen on your device. No upload, no account, no usage limits, and it keeps working offline.
      § 03 · how to use it

      Four steps, no manual.

      1. Open the helper in your browser, no signup or install needed.
      2. Type or paste your cron expression into the input, or click any preset chip to load an example.
      3. Read the plain-English description and the field-by-field breakdown to verify the schedule is what you meant.
      4. Check the next 5 run times panel to confirm exactly when the job will fire, computed in your timezone, on your device.
      § 04 · faq

      Frequently asked questions.

      Is the Cron Expression Helper free?
      Yes, completely free for everyone. No sign-up, no account and no usage limits.
      Is it private? Is my expression uploaded anywhere?
      No upload, ever. Parsing, validation and the next-run calculation all run in your browser on your own device, nothing you type leaves your computer.
      What cron syntax does it support?
      The standard 5-field crontab format: minute, hour, day-of-month, month, day-of-week. Each field accepts wildcards (*), numbers, ranges (1-5), lists (1,15), steps (*/5 or 2-10/2) and three-letter names like jan or mon. Both 0 and 7 mean Sunday.
      How are the next run times computed?
      The helper walks the calendar forward minute by minute from now (up to about four years) in your local timezone and lists the first five matches. It follows the classic Vixie-cron rule: when both day-of-month and day-of-week are restricted, the job fires when either one matches.
      Does it work offline?
      Yes, once the page has loaded, translating, validating and previewing run times all keep working without a connection, because every calculation runs locally.

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