Invalid binary. Use only 0 and 1.
Invalid hex. Use 0-9 and A-F.
Invalid octal. Use 0-7.
The Best Free Binary, Hex, Decimal Converter Online
If you are studying computer science, programming, or working with low-level hardware, you constantly need to convert numbers between different bases (binary, hexadecimal, decimal, and octal). The GadgetsFocus free online number base converter lets you type in any format and instantly see the equivalent value in all other bases.
How to Use
Simply type a number into any of the four input boxes. As you type, all three other boxes will update in real time. For example, type 255 in the Decimal box, and you will instantly see 11111111 in Binary, FF in Hexadecimal, and 377 in Octal.
What Are Number Bases?
- Decimal (Base 10): The standard counting system humans use every day (0-9).
- Binary (Base 2): The language of computers. Every piece of data in a computer is ultimately stored as binary (0s and 1s).
- Hexadecimal (Base 16): A compact way to represent binary data. Used heavily in CSS color codes (#FF0000), memory addresses, and networking.
- Octal (Base 8): Used in Unix file permissions (e.g.,
chmod 755) and some legacy systems.