Cron Expression Builder
Build cron schedule expressions visually. Test them against next-fire times.
0 * * * *What is Cron Expression Builder?
Cron is the standard syntax for scheduling recurring tasks on Unix systems. The format is five fields: minute, hour, day-of-month, month, day-of-week. Modern systems extend this to six fields (adding seconds). This builder helps you construct expressions without memorizing the syntax.
Frequently asked questions
What does '*/5 * * * *' mean?▼
How do I run something only on weekdays?▼
Related tools
JWT Decoder
Decode JSON Web Tokens (JWT) instantly — inspect the header, payload, and signature claims. Runs entirely in your browser; tokens never leave your device. Safe for production secrets.
JSON Formatter & Validator
Format, validate, and minify JSON instantly. Catches syntax errors with line numbers, pretty-prints with adjustable indent, supports large payloads. Runs in your browser — no upload.
XML Formatter & Beautifier
Format and beautify XML documents — proper indentation, line breaks, namespace handling. Useful for SOAP responses, sitemaps, RSS feeds, and Android resource files.
Base64 Encoder & Decoder
Encode and decode Base64 strings.
URL Encoder & Decoder
Encode/decode URL-safe strings.
HTML Entity Encoder & Decoder
Convert special characters to/from HTML entities.