Does it support fractions?

Only integers for now, since fractions often repeat infinitely across bases.

How large a number can it handle?

It uses BigInt, so there is no fixed digit limit and hundred-digit integers convert exactly.

Are my files or data uploaded?

No. Everything runs locally in your browser with no network upload, and is discarded when you close the page.

Do I need to sign up or pay?

No. The site is completely free, needs no account and has no usage limits.

🔢

🔢Number Base Converter - Binary/Octal/Decimal/Hex Online

Convert integers between binary, octal, decimal and hexadecimal, plus any base from 2 to 36. Built on BigInt so very large integers keep full precision. Pick the input base, type a value and see every base at once.

Loading tool...

How to use Base Converter

1Choose the base of your input value
2Type an integer (a leading minus is allowed)
3Read the binary/octal/decimal/hex and custom-base results and copy

FAQ

Does it support fractions?: Only integers for now, since fractions often repeat infinitely across bases.
How large a number can it handle?: It uses BigInt, so there is no fixed digit limit and hundred-digit integers convert exactly.
Are my files or data uploaded?: No. Everything runs locally in your browser with no network upload, and is discarded when you close the page.
Do I need to sign up or pay?: No. The site is completely free, needs no account and has no usage limits.