Cron expression builder & explainer

Cron expressions are powerful but cryptic — “0 */6 * * 1-5” is not obvious at a glance. This tool works both ways: it builds a five-field cron schedule from visual controls, and it explains an existing expression in plain English, so you can write or read one with confidence.

It also previews the next several execution times, which is the fastest way to confirm a schedule does what you meant before you deploy it. Getting a cron wrong can mean a job that never runs or one that runs far too often, so seeing the upcoming times catches mistakes early.

It runs in your browser and is useful for crontabs, scheduled cloud functions and any job runner that uses cron syntax. Build the schedule, read the description, check the preview, and copy the expression.