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Utilities
Number System Converter
Convert numbers between binary (base 2), octal (base 8), decimal (base 10), hexadecimal (base 16), and any custom base up to 36. Real-time conversion.
Custom Base Converter
Frequently asked
questions
Divide the decimal number by 2 repeatedly, recording the remainder each time. Read the remainders from bottom to top. For example, 13 in binary is 1101 (13÷2=6r1, 6÷2=3r0, 3÷2=1r1, 1÷2=0r1 → read 1101).
Hex is used because each hex digit represents exactly 4 binary bits, making it a compact way to express binary data. A byte (8 bits) is neatly expressed as 2 hex digits. Colors in CSS (#FF5733), memory addresses, and error codes are commonly written in hex.
Base 36 uses digits 0–9 and letters A–Z (36 symbols total). It is the most compact alphanumeric number system. It is commonly used for URL shorteners, session IDs, and other identifiers where brevity matters.