About the Number Base Converter
Type in any box and the others update. Uses arbitrary-precision integers, so very large numbers convert exactly.
Example
255 in decimal is FF in hexadecimal, 11111111 in binary and 377 in octal.
Number Base Converter
Convert numbers between decimal, hexadecimal, binary, octal and base 36 — exactly, at any size.
- Paste your input
- Choose the options
- Copy the output
Runs in your browser. Your data and files never leave your device.
Frequently asked questions
Can I paste 0x or 0b prefixes?
Yes, 0x (hex), 0b (binary) and 0o (octal) prefixes are accepted.
How do I read binary?
Each digit is a power of two from the right: 1, 2, 4, 8… So 1011 is 8 + 0 + 2 + 1 = 11.
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