Binary, Hex and Decimal Converter
Type a number in any base and see it in the other three immediately. Very large whole numbers are handled exactly.
Type in any box and the others update. Whole numbers of any size are supported; spaces and the prefixes 0x, 0b and 0o are ignored.
Runs in your browser. What you enter here is not sent to our server.
- Binary, decimal, hex and octal together
- Very large numbers supported
- Updates as you type
How to use the Binary, Hex and Decimal Converter
- Type a number into the box for the base you have.
- Read the other bases, which update as you type.
How the bases relate
Decimal uses ten digits, binary two, octal eight and hexadecimal sixteen (0 to 9, then A to F). One hexadecimal digit stands for exactly four binary digits, which is why hex is the usual shorthand for bytes: FF is 11111111, or 255.
| Decimal | Binary | Hex | Octal |
|---|---|---|---|
| 10 | 1010 | A | 12 |
| 16 | 10000 | 10 | 20 |
| 255 | 11111111 | FF | 377 |
| 1024 | 10000000000 | 400 | 2000 |
Questions about the Binary, Hex and Decimal Converter
Can I convert fractions or negative numbers?
Negative whole numbers work with a leading minus sign. Fractions are not supported.
Is there a size limit?
No practical one. Whole numbers with hundreds of digits are converted exactly.