BENCH

Number Base Converter

Convert between binary, octal, decimal, hex and any base

How it works

Enter a number and its current base, and it's shown simultaneously in binary (grouped into nibbles), octal, decimal and hexadecimal, plus any custom base from 2 to 36. All arithmetic uses BigInt, so even very large integers convert exactly without precision loss.

Frequently asked

What's the largest number it can convert?

Effectively unlimited for integers — conversions use JavaScript BigInt, so there's no 64-bit ceiling or floating-point rounding.

Which bases are supported?

Any base from 2 to 36 (digits 0–9 then A–Z), in addition to the standard binary, octal, decimal and hexadecimal views.