Cron Expression Builder
Build, decode, and convert cron expressions with a visual editor, and turn plain English schedules into cron with AI.
Learn the 5-field cron format, common patterns, and how to debug scheduled jobs that fire at the wrong time.
About this tool
Cron Builder
A cron expression builder helps you create and understand the schedule strings used by cron jobs, CI pipelines, and schedulers. Use the visual editor to pick minutes, hours, days, and months, and the matching cron expression is generated for you - no more memorizing the five-field syntax.
Paste any existing expression to decode it into a human-readable schedule, or describe the timing in plain English (for example, "every weekday at 9am") and let AI convert it to cron. It is free on the HACKUP Free plan.
Frequently asked questions
Cron Builder FAQ
- What is a cron expression?
- A cron expression is a string of five fields - minute, hour, day of month, month, and day of week - that defines a recurring schedule for running automated tasks.
- How do I read a cron expression?
- Read the five fields left to right: minute, hour, day of month, month, day of week. An asterisk means "every" value for that field. This tool decodes any expression into plain English for you.
- Can I convert plain English to cron?
- Yes. Describe the schedule in natural language, such as "every 15 minutes" or "at midnight on the first of the month," and the AI converter produces the matching cron expression.
- Is the cron builder free?
- Yes. The visual builder, decoder, and AI natural-language conversion are all included in the HACKUP Free plan.