Number Base Converter
Convert numbers between binary, octal, decimal, and hex.
Free · No sign-up · Works in your browser
Binary (base 2)
11111111
Octal (base 8)
377
Decimal (base 10)
255
Hexadecimal (base 16)
FF
About the Number Base Converter
Free number base converter — convert numbers between binary, octal, decimal, and hexadecimal instantly.
How to use the Number Base Converter
- 1Enter a value and select its input base.
- 2See it converted to all common bases.
- 3Copy the representation you need.
Frequently asked questions
Which bases are supported?
Binary (2), octal (8), decimal (10), and hexadecimal (16).
Can it handle large numbers?
It converts standard integers reliably; extremely large values may exceed JavaScript's safe integer range.