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Convertto

Number Base Converter

Convert numbers between any base from 2 to 36 — binary, octal, decimal, hexadecimal and beyond.

To convert a number between bases, enter the value, pick the base it is written in and the base you want. This converter supports every base from 2 to 36 and uses arbitrary-precision arithmetic, so numbers far larger than 64 bits convert exactly without rounding.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Can it handle very large numbers?

Yes. Conversion uses JavaScript BigInt rather than floating-point numbers, so values with hundreds of digits convert exactly with no precision loss.

How to use the number base converter

  1. 1Enter or paste your value.
  2. 2Choose the from base.
  3. 3Choose the to base.
  4. 4The result appears immediately — copy or download it.

Embed this tool

Put the working number base converter on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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