Programming & Dev Calculators

    Free developer tools — binary/hex converter, color picker, JSON formatter, and regex tester. Essential utilities for programmers.

    4 Free Tools

    Binary / Hex Converter

    Decimal, binary, octal & hex

    Color Picker

    HEX, RGB & HSL converter

    JSON Formatter

    Format, validate & minify JSON

    Regex Tester

    Test regular expressions live

    Formula Guides

    How to Convert Between Binary, Decimal, Octal & Hex

    How to Convert HEX, RGB & HSL Colors

    How to Format and Validate JSON

    How to Write and Test Regular Expressions