Base Converter

Convert numbers between Binary (base 2), Octal (base 8), Decimal (base 10), and Hexadecimal (base 16) instantly.

Enter Number

Invalid characters for selected base

Input Base

Quick Reference Table

Decimal	Binary	Octal	Hex

Binary (Base 2)

Digits: 0, 1. Used by all computers and digital systems at the hardware level.

Octal (Base 8)

Digits: 0-7. Used in Unix file permissions (e.g. chmod 755).

Decimal (Base 10)

Digits: 0-9. The everyday number system.

Hexadecimal (Base 16)

Digits: 0-9 + A - F. Used in colors (#FF5733), memory addresses, and encoding.

One hex digit = 4 binary digits (a "nibble"). Two hex digits = one byte (8 bits). So FF = 11111111 = 255.