🔢 Number Base Converter
Type in any field to convert between Binary, Octal, Decimal, and Hexadecimal instantly.
Base 10
Decimal
Base 2
Binary
Base 8
Octal
Base 16
Hexadecimal
Quick examples
255 (FF)
1024 (1K)
65535 (FFFF)
42 (the answer)
0
Number Bases Explained
Binary (Base 2) uses only 0 and 1. It's the foundation of all digital systems — each digit is one bit.
Octal (Base 8) uses digits 0–7. Common in Unix file permissions (e.g., chmod 755).
Decimal (Base 10) is everyday counting — digits 0–9.
Hexadecimal (Base 16) uses 0–9 and A–F. Widely used in web colors (#FF5733), memory addresses, and byte representation.