Cookie preferences
We use cookies for analytics. Privacy Policy You can accept or decline non-essential tracking.
Validate cron expressions online instantly. Test your cron syntax, see next 5 run times, and understand cron schedule patterns with a free browser-based tool.
> Validation and explanation of cron schedules.
> Next runs, breakdown of each field.
Cron expressions define schedules for automated tasks. The standard 5-field format is minute hour day-of-month month day-of-week. Our validator checks syntax against POSIX cron, shows the next 5 execution times, and explains each field. Common patterns: 0 * * * * (every hour), 0 9 * * 1-5 (weekdays at 9am), */15 * * * * (every 15 minutes), 0 0 1 * * (first of each month).
*/15 in the minute field means 'every 15 minutes'. The asterisk (*) means 'any'. So */15 means 0, 15, 30, 45 minutes. The remaining * * * * means every hour, every day, every month, every weekday.
Regex Tester
Test regular expressions with live match highlighting and capture groups.
Timestamp Converter
Convert Unix timestamps and ISO 8601 values locally, switch between seconds and milliseconds, and inspect UTC vs local time without uploads.
JSON Formatter
Validation, formatting and syntax highlighting for JSON.
Base64
Encode and decode text to/from Base64 format with UTF-8 support.