Cron Expression Parser & Builder

What is Cron?

A two-way cron utility. Paste an expression like '0 9 * * 1-5' to see it explained in English, or assemble a schedule from selects and get the expression.

How it works

A small parser splits the 5 fields (minute, hour, day of month, month, day of week), expands ranges/lists/steps, and maps numeric values to names.

1. Enter your input. Type or paste your input into the field above — the tool responds instantly.
2. Review the result. Output updates live as you type. Everything runs entirely in your browser.
3. Copy or download. Use the Copy button to grab the result, or Download to save it as a file.

Examples

Realistic sample

Paste or type any realistic input — the tool computes the result locally and instantly.

Common mistakes

Expecting a server round-trip

Nothing is uploaded — every tool in this category runs entirely in your browser.