Hexadecimal Converter

This free hexadecimal converter does two jobs. In Number basesmode, every field — decimal, hexadecimal, binary and octal — is live and editable: type a value in any base and the other three update instantly, with big-integer precision (no 53-bit rounding), optional uppercase and a0x prefix, and a signed two's-complement reading at 8, 16, 32 and 64 bits. In Text ↔ Hex mode it converts text to its hex byte codes and back across UTF-8, UTF-16 (little- and big-endian) and Latin-1, with a choice of byte separators (space, none, comma, colon, or0x/\x prefixes) and upper- or lowercase output. You can load a file to dump its bytes as hex, copy any field, or download the hex. Pasted hex is forgiving — mixed spacing, commas, colons, prefixes, or one unbroken string all parse.

Hexadecimal is the compact base-16 notation used for colors, memory addresses, byte data and machine code, where each digit maps to exactly four bits.