🔢 Number Base Converter

Convert between binary, decimal, hexadecimal, and octal

Input

Number

Base

All Conversions

Binary (Base 2)

Octal (Base 8)

Decimal (Base 10)

Hexadecimal (Base 16)

FAQ

What is a number base?

A number base (or radix) defines how many unique digits are used. Decimal uses 0-9 (base 10), binary uses 0-1 (base 2), octal uses 0-7 (base 8), and hexadecimal uses 0-9 and A-F (base 16).

Why do programmers use hexadecimal?

Hexadecimal is compact — each hex digit represents exactly 4 binary bits. This makes it easy to read memory addresses, color codes (#FF0000), and byte values without writing long binary strings.