Number Base Converter Online

What is binary (base 2)?

Binary is a number system that uses only two digits: 0 and 1. It is the native language of computers since transistors represent two states — off (0) and on (1). For example, the decimal number 42 is 101010 in binary.

What is octal (base 8)?

Octal uses digits 0–7. It was historically common in computing and is still used today for Unix file permissions (e.g. chmod 755). Each octal digit maps exactly to 3 binary digits.

What is hexadecimal (base 16)?

Hexadecimal uses digits 0–9 and letters A–F to represent values 0–15. It is widely used in programming for memory addresses, color codes (#FF5733), and byte-level data because each hex digit maps to exactly 4 binary bits (one nibble).

What is a nibble?

A nibble is 4 bits, which is half a byte. One hexadecimal digit always represents exactly one nibble. This tool groups binary output in sets of 4 bits for easier reading — e.g. 1010 0101 instead of 10100101.

Can this tool handle negative numbers?

No — this tool converts non-negative integers only. Negative number representation (two's complement, sign-magnitude) varies by architecture and word size, which is beyond the scope of a general base converter.

What is the maximum number supported?

The tool uses JavaScript's built-in parseInt and toString, which support integers up to 2^53 - 1 (Number.MAX_SAFE_INTEGER = 9007199254740991). For cryptographic or 64-bit register values you may need a big-integer library.