Tools · Dev utilities
Number base converter
Convert between binary, octal, decimal and hex with arbitrary-precision integers.
Binary · base 21111 1111
Octal · base 8377
Decimal · base 10255
Hexadecimal · base 16ff
Arithmetic uses native BigInt — no precision loss, even for 128-bit numbers.
The link encodes your inputs in the URL fragment. Nothing is uploaded.