Developer toolbox
A fast, modern toolbox for developers and operators. Everything runs locally in your browser; no data leaves your device.
Smart subnet calculator
NetworkVisual IP/CIDR matching and subnetting with IPv4/IPv6, binary/decimal/hex bitmaps, wildcard masks, VLSM and hierarchy views.
Unix timestamp and timezone converter
ConvertersConvert milliseconds/seconds both ways, compare time zones, estimate relative time and copy timestamp snippets for common languages.
Log formatter and structured cleaner
DevOpsPretty-print JSON/NDJSON, extract Spring/Java stack traces, parse Nginx access logs, color ERROR/WARN and filter by keywords.
Base64 and Base encoders
ConvertersStandard Base64, URL-safe Base64, Base32, Base16 (hex) and Base58, with full Chinese-character and binary safety.
Cron expression builder and simulator
DevOpsBuild Linux Crontab and Quartz/Spring six-field expressions, read them in plain language and preview upcoming runs.
Regex tester and cheat sheet
DevOpsLive RegExp matching, multi-color capture groups, replacement preview and a built-in cheat sheet of common patterns.
Hash calculator and local file verification
SecurityMD5, SHA-1/256/512 and SM3 in a local browser sandbox, with text/file drag-and-drop verification and HMAC mode.
JSON formatter and visual diff
DataFormat, minify, repair and escape JSON, then compare two documents side by side with precise add/remove/change markers.