Number Base Converter
Convert between binary, octal, decimal, and hexadecimal. Supports very large integers via BigInt.
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Binary (base 2)
11111111
Octal (base 8)
377
Decimal (base 10)
255
Hexadecimal (base 16)
ff
How to use
- 1Pick the input baseBinary (2), octal (8), decimal (10), or hex (16).
- 2Type a valueAll four representations render simultaneously.
- 3Copy anyOne click per row.
FAQ
How big can the numbers be?
BigInt-backed — practically unlimited (limited only by browser memory).
Are negative numbers supported?
Not yet. V1 handles non-negative integers.