What Is a Crontab Generator?
A crontab generator builds a cron expression — the five-field line that schedules a repeating job on a server. Pick the minute, hour, day and month from the lists and the expression appears at once, with a plain-English sentence that says what it means, such as “At 09:30 every weekday”.
Cron has been the standard way to schedule jobs on Unix-like systems for decades. Backups, reports, cleanup scripts and reminders all run on cron lines. The format is compact, which makes it easy to mistype: one field in the wrong place can turn a daily job into an hourly one.
This generator removes the guesswork. Every field is a labelled list, the common schedules are one-click presets, and the plain-English description lets you check the result before you paste it anywhere. Everything runs in your browser — no account, no server, nothing uploaded.
How to Use the Crontab Generator
- Pick a preset for a common schedule, or set each field yourself.
- Choose the minute and hour the job should run. Use a star (*) for “every” and a step such as */15 for “every 15 minutes”.
- Choose the day of month, month and day of week. Leave them as stars to run every day.
- Read the cron expression in the output box and the plain-English sentence under it. Check the sentence matches what you meant.
- Press Copy cron expression.
- Paste the expression into your crontab, scheduler or workflow file.
Key Features of This Crontab Generator
- Five labelled pickers: minute, hour, day of month, month, day of week
- Live cron expression that updates with every change
- Plain-English description of every schedule
- One-click presets: every minute, hourly, daily, weekdays, weekly, monthly
- Weekday (Mon–Fri) and weekend (Sat–Sun) shortcuts
- Step values such as */5 and */15 for repeating intervals
- Copy button for the finished expression
- Runs in your browser, so nothing is uploaded
Why Use a Crontab Generator?
A cron expression is five numbers in a row, and the order matters. Swapping the minute and hour fields is an easy mistake that is hard to spot by eye — 30 9 and 9 30 look similar but run at very different times. Building the expression from labelled pickers takes that risk away.
The plain-English description is the real check. Reading “At 09:30 every weekday” tells you in one glance whether the schedule is right, while “30 9 * * 1-5” takes a moment to decode. Checking the sentence before copying saves a mis-scheduled backup or a report that fires at 3 a.m.
Presets cover the schedules most people need. Daily, hourly, weekly and monthly jobs are one click, and the weekday preset handles the common “every workday morning” case without working out the day-of-week numbers.
Who Uses a Crontab Generator?
- Developers scheduling backups, reports and cleanup scripts on a server
- System administrators setting up regular maintenance jobs
- Anyone adding a scheduled workflow to GitHub Actions or a similar service
- Bloggers and shop owners scheduling automatic posts or data exports
- Students learning how cron scheduling works
- Anyone who wants to double-check a cron line before saving it
Tips for Writing Cron Schedules
- Read the plain-English description before copying. If it does not match what you meant, a field is wrong.
- Remember that 0 is Sunday and 6 is Saturday in the day-of-week field. 1-5 means Monday to Friday.
- When both day of month and day of week are set, most cron systems run the job when either one matches, not both. Leave one of them as a star unless you know your system treats them differently.
- Test a new schedule with a harmless command first, so a mistake does not delete or overwrite real data.
- Check the server timezone. A job set for 09:30 runs at 09:30 server time, which may not be your local time.
- Avoid scheduling heavy jobs at the top of the hour, when many other systems run theirs too. A minute like 07 or 23 spreads the load.
Crontab Generator FAQ
What is a crontab schedule?
A crontab schedule is a short line that tells a computer when to run a job — for example a backup, a report or a cleanup script. The five fields are minute, hour, day of month, month and day of week. The line 30 9 * * 1-5 means 09:30 on weekdays.
What do the five fields mean?
From left to right: minute (0–59), hour (0–23), day of month (1–31), month (1–12) and day of week (0–6, where 0 is Sunday). A star (*) means every value for that field, so * * * * * runs every minute and 0 0 * * * runs once a day at midnight.
What does */5 mean in a cron field?
The slash means a step. */5 in the minute field means every 5 minutes: 0, 5, 10, 15 and so on. */2 in the hour field means every 2 hours. A step always starts at the smallest value for that field.
Which timezone does my cron job run in?
The timezone of the server or service that runs it, not your browser. A job set for 09:30 runs at 09:30 server time. If the server is in a different timezone, adjust the hour or set the server timezone first.
Can I use this expression in GitHub Actions?
Yes, scheduled workflows use the same 5-field cron format. Note that GitHub Actions scheduled runs can be delayed and run in UTC, so check your workflow file's timezone handling before relying on an exact minute.
Does this tool run the job for me?
No. It only builds the expression and explains it in plain English. You paste the expression into your server's crontab, a scheduler, or a workflow file, and that system runs the job.