Number Base Converter
Binary, octal, decimal, hex & any base.
Runs entirely in your browser — nothing you enter is uploaded, logged, or tracked.
Enter a number in any base and read it back in binary, octal, decimal, hexadecimal, and a custom base — converted instantly with arbitrary precision via BigInt.
36
Frequently asked questions
What bases are supported?
Binary (2), octal (8), decimal (10), hexadecimal (16), and any custom base from 2 to 36 using digits 0–9 and letters a–z.
Does it handle very large numbers?
Yes — conversions use JavaScript BigInt, so huge integers convert exactly without floating-point rounding.