Number Base Converter

Convert numbers between any bases

Numbers can be written in different bases, decimal, binary, hexadecimal, octal, or any base from 2 to 36, and converting between them is common in programming. This tool converts a number between all these bases at once.

Why bases matter in programming

Different bases suit different purposes: binary shows the actual bits, hexadecimal packs those bits compactly and maps cleanly to bytes, decimal is human-natural, and octal appears in file permissions. Converting between them is constant when working close to the hardware, reading a bitmask, a colour value, a memory address. Doing it by hand is error-prone, especially for larger numbers. Seeing a value in every base at once, and being able to convert from any base to any other, removes that friction and the mistakes that come with manual conversion.

Any base, instantly

It runs entirely in your browser, so nothing you paste is uploaded and the result is yours to copy straight into a project. Because it works client-side, you can use it on private code and data without anything leaving your machine.

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