The fastest way to read and build crontab expressions
AG Cron is a free developer tool that instantly decodes crontab expressions into a human-readable schedule description with no sign-up or install, and previews the upcoming run times.
It supports the standard Unix 5 fields (minute, hour, day of month, month, day of week), the *, ,, -, and */n syntax, day/month names, and macro aliases like @daily and @hourly. When you enter an expression, the meaning of each field is broken down into cards so you can immediately see what's wrong.
All parsing and calculation happen entirely within your browser, and none of the values you enter are sent to or stored on any server.
Instantly explains complex cron expressions in human-readable sentences.
Calculates and shows the next 8 run times in your browser's time zone.
Assemble the minute, hour, day of month, month, and day of week, or start quickly with a preset.
All calculations happen in your browser only and are never sent to a server.
Paste a cron expression into the input at the top, or pick a preset.
The explanation sentence, next run times, and per-field breakdown are shown in real time.
Adjust the values with the field builder, then grab the expression with the copy button.