Number Base Converter
Convert between binary, octal, decimal and hex.
Runs in your browser: what you paste is never uploaded
8 bits · any size works (no 2⁵³ limit)
How to use Number Base Converter
- 1Paste or type your inputUse the box above, or click Sample to try it with an example.
- 2Choose your optionsType in any base; pick a custom base for the extra field and whether hex letters are uppercase.
- 3Copy the resultCopy it with one click. Nothing is sent anywhere.
About Number Base Converter
Convert numbers between binary, octal, decimal, hexadecimal and any base from 2 to 36. Edit any field and the others follow.
Frequently asked questions
Does it handle very large numbers?
Yes. Numbers are exact at any size, beyond JavaScript's usual 2^53 limit.
Are negative numbers supported?
Yes, with a leading minus sign.
Is what I paste sent anywhere?
No. The tool runs entirely in your browser and never sends what you type or paste to a server.
Is it free?
Yes. It's free, with no sign-up and no limits.