Number Base Converter

Convert numbers between binary, octal, decimal, hex and any base from 2 to 36 — even very large numbers.

What is a number base?

A number base (radix) is how many different digits a number system uses: binary uses 2 (0–1), octal 8, decimal 10 and hexadecimal 16 (0–9 and A–F). The same value can be written in any base.

Examples

Decimal	Binary	Octal	Hex
10	1010	12	A
255	11111111	377	FF
4096	1000000000000	10000	1000

Features

Input in base 2, 8, 10, 16, 32 or 36; prefixes like 0x, 0b and 0o are accepted.
Arbitrary precision with BigInt — no rounding errors, even for 100-digit numbers.
An extra target base of your choice (2–36).
Bit and byte length of the number.

Frequently asked questions

Does it support negative numbers?

Yes, a leading minus sign is kept in every base.

Does it support fractions?

No, it converts whole numbers (integers).

Why is hex used in programming?

One hex digit is exactly four bits, so bytes (two hex digits) are easy to read.