Cron syntax is five positional numbers with no labels, so everyone reads it by counting fields on their fingers. Paste an expression here and get it in plain English, broken out field by field, with the next run times listed as real dates. Those run times are the point: a description can be misread, but a list of timestamps one minute apart tells you immediately that "0 9 * * *" is not what you typed. If the runs are evenly spaced the interval is stated outright, which is what catches the classic mistake of writing a schedule that fires sixty times an hour. You can also build an expression from labelled fields with their valid ranges always visible, and the two views stay in sync in both directions. Timezone aware, and everything runs in your browser.
This tool does not use any data storage or network traffic.
Fields
Next runs
Presets
Syntax reference
Note the two easy mistakes: months are numbered from 1 but weekdays from 0, and Sunday is 0. This tool covers standard five-field cron only — not seconds fields, @daily-style macros, or the L and W specifiers some implementations add.
Nothing leaves your browser
Expressions are parsed and scheduled locally. Nothing is uploaded, nothing is stored, and reloading the page clears it.