Hex to Decimal Converter

Hexadecimal is how machines show you numbers: memory addresses, pointer values, byte dumps, color channels, error codes. Converting to decimal is how you make them human-sized again. Paste a hex value above — with or without the 0x prefix, uppercase or lowercase — and the decimal spelling appears instantly, alongside binary and octal for good measure.

The From base is pre-set to 16 here, so 0x literals like 0x7fff0000 paste straight in. And because the conversion runs on arbitrary-precision integers, a full 64-bit address like 0xFFFFFFFFFFFFFFFF converts exactly — no floating-point rounding past 2^53 like most online converters.

FAQ

Do I need to strip the 0x prefix first?

No. With the base set to 16 the prefix is recognized and stripped automatically. It is only rejected when it does not match the selected base, so a stray 0x can never be silently misread.

Does letter case matter in hex?

No. A-F and a-f are interchangeable; FF and ff are both 255.

How big a hex number can I convert?

Effectively unlimited. The converter accumulates digit-by-digit with big integers, so 128-bit hashes and giant addresses convert exactly.