Free developer & sysadmin tools
Fast, private utilities that run entirely in your browser. No sign-up, no tracking of what you type, no uploads.
Cron Expression ExplainerUnderstand a cron schedule and see the next run times.Chmod CalculatorConvert Linux file permissions between octal and symbolic.Unix Timestamp ConverterConvert epoch seconds/milliseconds to dates and back.Password GeneratorGenerate strong random passwords locally.JSON Formatter & ValidatorPretty-print, minify and validate JSON with clear errors.Base64 Encode / DecodeEncode and decode Base64, with correct UTF-8 handling.UUID GeneratorGenerate random v4 UUIDs in bulk.IPv4 Subnet (CIDR) CalculatorNetwork, broadcast, mask and host range from a CIDR.