Hex to Binary Converter

Hexadecimal (base 16) and binary (base 2) are both ways of writing the same numbers, and converting between them is a fixed digit-by-digit substitution. Because 16 is 2 to the fourth power, every single hex digit maps to exactly one group of four binary digits, called a nibble: 0 becomes 0000, 9 becomes 1001, A becomes 1010, and F becomes 1111. This clean alignment is why hex is so popular for writing out binary data compactly. To convert, you replace each hex digit with its 4-bit pattern and concatenate the results; no arithmetic on the whole number is needed. This tool does exactly that. It first strips an optional leading 0x and removes any whitespace, then checks the remaining text against the digits 0-9 and the letters a-f or A-F. If the string is valid, each character is converted with parseInt(digit, 16) and padded to 4 bits, then the nibbles are joined with spaces for readability. Note that it treats the input purely as a sequence of hex digits, so it does not handle signed values, a minus sign, fractional points, or 0b-style prefixes; anything outside 0-9 and A-F simply produces no output.