How to use this tool
- Pick a common preset, or type your own 5-field cron expression.
- Read the plain-English explanation to confirm it means what you think.
- Check the next 5 run times before using it in a real job.
Frequently asked questions
- What are the 5 fields in a cron expression?
- In order: minute (0-59), hour (0-23), day of month (1-31), month (1-12), and day of week (0-6, where 0 is Sunday). Each field accepts *, a single value, a range like 1-5, a list like 1,3,5, or a step like */15.
- What happens if both day-of-month and day-of-week are restricted?
- Cron's well-known quirk: when both fields are set to something other than *, the job runs when EITHER matches, not only when both match. This tool's explanation calls this out explicitly whenever it applies.
- What time zone are the "next run times" shown in?
- Your browser's local time zone. If the system that actually runs this cron job is configured for a different time zone (many servers run in UTC), the real run times will differ accordingly.
- Is my expression uploaded anywhere?
- No — parsing, the explanation, and the next-run calculation all happen entirely in your browser. Nothing is uploaded.
How GetByteRush compares
Most free tools for this online work the same way: you upload your file to their server, wait, then download the result — which means your file (and often your email, for a "free" account) sits on someone else's infrastructure. Here's the actual difference:
| Feature | GetByteRush | Typical online tools |
|---|---|---|
| Data ever leaves your device | No — parsed in this tab | Yes, uploaded to process |
| Shows actual next run times, not just a description | Yes | Varies — some tools only describe the schedule |
| Account required | Never | Often, past a certain usage level |
("Typical online tools" reflects publicly documented behavior of common free file-processing sites as of 2026 — always check a specific competitor's own privacy policy and pricing page, since these details change.)