Converters · Numbers

Number Base

Convert integers between binary, octal, decimal and hexadecimal in one place.

Input base

Binary

11111111

Octal

Decimal

Hex

ff

Frequently asked

How big a number can it handle?

Up to JavaScript's safe integer limit (2^53 − 1). Invalid digits for the chosen base are flagged.

Is my data uploaded anywhere?

No. This tool runs entirely as JavaScript in your browser — your input never leaves your device and nothing is logged.

Pick the input base.

Type your number.

Read and copy it in every base at once.