Cron Expression Builder — Free Online Tool

What is the Cron Expression Builder?

The Cron Expression Builder is a free browser-based tool that parses cron expressions into plain English and shows the next 5 scheduled run times. Enter any standard 5-field cron expression, choose a timezone, and instantly see what the schedule means and when it will next trigger.

Cron is the standard Unix job scheduler. Expressions like 0 9 * * 1-5 are terse and hard to read at a glance — this tool translates them into a human-readable explanation and concrete run times so you can verify your schedule is correct before deploying.

How to Use the Cron Expression Builder

1. Type a cron expression into the input field (e.g. */15 * * * *)
2. Optionally select UTC or Local timezone
3. Click Parse or press Enter
4. Read the plain-English explanation and check the next 5 run times
5. Use the Presets dropdown to load common schedules as a starting point, or test field patterns with the Regex Tester

Cron Expression Syntax

A standard cron expression has five fields separated by spaces:

┌──────── minute (0–59)
│ ┌────── hour (0–23)
│ │ ┌──── day of month (1–31)
│ │ │ ┌── month (1–12)
│ │ │ │ ┌ day of week (0–7, both 0 and 7 are Sunday)
│ │ │ │ │
* * * * *

Special characters:

• * — every value
• */n — every nth value (e.g. */5 means every 5 minutes)
• n-m — range (e.g. 1-5 means Monday through Friday)
• n,m — list (e.g. 1,15 means the 1st and 15th)

Common Cron Schedules

Frequently Asked Questions

Does this tool support 6-field cron expressions (with seconds)?
Yes — if you provide 6 fields, the first field is treated as seconds.

Why does the next run time look slightly off?
The tool calculates runs by iterating forward minute-by-minute from the current time. Timezone offsets may affect results when switching between UTC and Local.

For Linux scheduling commands, see the Linux Commands Cheat Sheet — or assign unique identifiers to each job with the UUID Generator.