UUID v4
Random UUID.
Open toolLibrary
Developer tools
Developer calculators and utilities on Netra Code.
Password generator
Random passwords.
Open toolMD5 hash
Browser SubtleCrypto MD5 fallback digest note.
Open toolSHA-256 hash
Web Crypto SHA-256.
Open toolSHA-1 hash
Web Crypto SHA-1.
Open toolJWT decoder
Decode payload only — does not verify signatures.
Open toolHex to RGB
Colour conversion.
Open toolRGB to hex
Colour conversion.
Open toolColour contrast
WCAG ratio of two hex colours.
Open toolPX to REM
Assume 16px root.
Open toolRegex escape
Escape special characters.
Open toolCSS minify
Rough whitespace squeeze.
Open toolHTML minify
Collapse whitespace.
Open toolFive-field cron explainer
Very small reader.
Open toolUser agent
Your browser UA.
Open toolIP placeholder
We do not look up IPs. Shows how to find yours.
Open toolNil UUID
RFC nil value.
Open toolShort id
URL-safe id.
Open toolLuhn check
Checksum for test numbers you type.
Open toolPassword strength
Length and variety score.
Open tool