Number Base Converter

There is no practical limit: the tool uses arbitrary-precision integers, so a 200-digit decimal number converts exactly. Fractions are not supported; type whole numbers only.

Yes. The prefixes 0x, 0b and 0o are accepted when they match the base you convert from. Spaces, underscores and commas between digits are ignored, and a leading minus sign is kept.

With a minus sign in every base, for example −255 is -ff in hexadecimal. Computers usually store negative numbers as two’s complement, which depends on a fixed width like 32 bits, so it isn’t shown here.

The letters a to z, so base 16 uses 0–9 and a–f and base 36 uses all digits and letters. Letters are case-insensitive when typed; tick “Uppercase letters” to show them in capitals.

It is free to use and there is nothing to sign up for. There are no watermarks and no daily limits.