Hex Converter: Convert Between Decimal, Hexadecimal, Binary & Octal
Number base conversion is a fundamental skill in programming, computer science, and digital electronics. Our free hex converter lets you instantly convert between decimal (base 10), hexadecimal (base 16), binary (base 2), and octal (base 8) number systems. Simply enter a number in any base and see all four representations simultaneously.
Hexadecimal is widely used in programming because it provides a compact way to represent binary data. Each hex digit maps to exactly 4 binary digits (bits), so a byte (8 bits) can be represented as exactly 2 hex digits. This makes hex ideal for representing memory addresses, color codes, MAC addresses, and raw binary data in a human-readable format.
Binary is the fundamental language of computers, where all data is ultimately represented as sequences of 0s and 1s. Understanding binary helps with bit manipulation, network subnet masks, file permissions in Unix systems, and low-level programming. Octal (base 8) is commonly used for Unix file permissions (chmod) and was historically used in some computing contexts.
The converter supports standard prefixes: 0x for hexadecimal (e.g., 0xFF), 0b for binary (e.g., 0b11111111), and 0o for octal (e.g., 0o377). Each converted value includes a copy button for quick clipboard access, making it easy to use the results in your code, documentation, or calculations.