Hex / Decimal / Binary Converter

How to use the number base converter

Computers read binary, network engineers read hex, humans read decimal. Moving between them by hand is error-prone once numbers get beyond a byte or two — this converter does it for you, with strict validation so you always see where an invalid digit sits.

1. Pick the source base of the number you have: binary (base 2), octal (base 8), decimal (base 10), or hexadecimal (base 16).
2. Type your number into the matching input. Case does not matter for hex — both FF and ff work.
3. Read the other three bases as they update. Negative numbers are supported; fractional numbers are not (computer arithmetic for fractions belongs in its own tool).
4. The binary output also shows a byte-grouped view for readability when the value fits in 32 bits.

Quick reference

• Binary uses digits 0–1.
• Octal uses 0–7. It compresses three binary digits into one.
• Decimal is the everyday 0–9.
• Hex uses 0–9 and A–F, compressing four binary digits per hex digit. That is why MAC addresses, colors, and memory addresses use it — a 32-bit address fits in 8 hex characters.