Cron Expression Parser – Parse Cron Online (Free Tool)

Cron Expression Parser turns a 5- or 6-field cron line into plain English and lists the next 5 run times in your chosen timezone. Critically, it implements the POSIX day-of-month OR day-of-week semantics correctly — many tools get this wrong, which is how production cron jobs end up firing too often or not at all.

• No API keys to manage and no rate limits to monitor
• 100% free with no hidden costs or daily limits
• Works offline after the first page load
• No telemetry on the tokens, payloads, or code you paste in
• Built for developer workflows: copy-friendly output, syntax-aware highlighting where useful

1. Paste a cron expression (5-field or with optional 6th seconds field)
2. Read the human-readable schedule description
3. Pick a timezone — the next 5 run times are computed using that zone's calendar
4. Use the quick samples for common patterns (every 5 min, weekdays 9 AM, etc.)

• Designing a new cron schedule and confirming it fires when intended
• Debugging a job that ran too often / too rarely — verify DOM/DOW logic
• Translating server-time crons to your local timezone for on-call planning
• Onboarding new engineers who need to read existing crontab entries

"Cron expression must have 5 or 6 parts" error.

Strip extra whitespace and confirm you have exactly: minute hour day-of-month month day-of-week (and optionally seconds at the front for 6-field).

Next runs not in my expected timezone.

Open the timezone selector and pick the zone the cron server uses (often UTC for cloud cron). The page defaults to your browser locale, which may differ.