Binary & Hex Converter
Convert between binary, decimal, hexadecimal and octal instantly.
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Number Base Guide
Decimal (base 10) is our everyday number system using digits 0-9. Binary (base 2) uses only 0 and 1, fundamental to computing. Hexadecimal (base 16) uses 0-9 and A-F, widely used in programming, colour codes and memory addresses. Octal (base 8) uses 0-7, used in Unix file permissions.
Common Conversions
255 decimal = 11111111 binary = FF hexadecimal = 377 octal. The hex colour #FF5733 uses two hex digits per colour channel (R=FF, G=57, B=33). In decimal that's RGB(255, 87, 51).
Frequently Asked Questions
What is binary used for?
Binary is the foundation of all digital computing. Every piece of data on a computer — text, images, programs — is ultimately stored and processed as binary (0s and 1s).
What is hexadecimal used for?
Hexadecimal is used in programming, web colour codes, memory addresses, and computer hardware. It's a compact way to represent binary values.
Is the binary converter free?
Yes, completely free with no sign up required.