Binary / Decimal / Hex Converter

How it works

This tool converts a whole number between binary, decimal and hexadecimal. It reads the digits as an exact whole number (BigInt) and never turns the value into an ordinary floating point number, so results stay exact for numbers of any practical size.

A minus or plus sign is allowed at the front. Negative numbers keep their minus sign, so decimal -10 is binary -1010 and hexadecimal -A. This is not two's complement, which needs a fixed number of bits. Hexadecimal output uses capital letters A to F, and input accepts either case. Spaces, commas and underscores inside the number are refused, not removed. Input is limited to 1,000 characters.