Number Base Converter

Convert numbers between binary, octal, decimal, hexadecimal, and any base 2-36. Live two-way: edit any field, the others update. Useful for low-level work, IP math, bit manipulation, or sanity-checking that 0xFF really is 255.

How to use the Number Base Converter

Type a number in any field. The other bases update live. Hex accepts 0x prefix or bare; binary accepts 0b prefix or bare. Negative numbers work for decimal, displayed as two's complement for hex/binary up to 64-bit precision.