Number Base Converter

What is Number Base Converter?

A base converter that translates an integer between any radix from 2 to 36, showing binary, octal, decimal, and hexadecimal results at the same time and handling values well beyond 64 bits. Conversion happens entirely in the browser, with no network request.

How to use Number Base Converter

1. 1Enter a value and pick the base it is currently written in.
2. 2Read off the four common bases, which update as you type.
3. 3For any other radix, use the custom base field and choose a value between 2 and 36.
4. 4Copy any result with one click; hexadecimal output is lowercase by default.

How do I do this in code?

Use the tool above for one-off work; for anything you repeat, move it into a script or your project.

parseInt('ff', 16);        // 255 - always pass the radix explicitly
(255).toString(2);         // '11111111'

// Use BigInt for large integers
BigInt('0xffffffffffffffff').toString(10);

Common errors and how to fix them

Frequently asked questions