All Tools Text & Writing Image Tools Calculators Converters Developer Tools Security & Privacy

Number Base Converter

Convert a number between binary, decimal, hexadecimal, and octal bases instantly. Enter a value in any one base and the others update automatically — useful for low-level programming, color codes, and debugging.

Where each base is used

Binary (base 2) is how computers represent data at the lowest level. Hexadecimal (base 16) is a compact way to write binary data — common in color codes (#FF5733) and memory addresses. Octal (base 8) shows up in Unix file permissions (e.g. chmod 755).

More Developer Tools tools

We use cookies and local storage for basic site functionality and analytics. See our Privacy Policy for details.