Hex Converter

Each hex digit has a place value that is a power of 16, reading from right to left: 1, 16, 256, 4096… Convert letters to numbers (A=10, B=11, C=12, D=13, E=14, F=15), multiply each digit by its place value, and add. For 2F: 2×16 + 15 = 47. For 0xFF: 15×16 + 15 = 255.

Hexadecimal (base 16) is a compact shorthand for binary — one hex digit represents exactly four bits. It is used everywhere in computing: HTML/CSS colors (#FF5733), memory addresses in debuggers, MAC addresses, UTF-8/Unicode code points, hash digests, and machine-readable machine instructions. Two hex digits always describe one byte.

0xFF means the two hex digits F and F. The left F is in the 16s place (15×16 = 240) and the right F is in the 1s place (15×1 = 15), so 240 + 15 = 255. Because one byte holds 8 bits (2^8 = 256 possible values from 0 to 255), 0x00–0xFF is the exact range of a single byte.

Repeatedly divide by 16 and record the remainders from last to first, mapping 10-15 to A-F. For 250: 250÷16=15 r10 (A), 15÷16=0 r15 (F), so the answer reads FA. The tool also accepts 0x-prefixed input and converts instantly, including negative-free values of any size using exact BigInt arithmetic.

These are the standard prefixes used in code to mark a number's base: 0x or 0X for hexadecimal (0xFF), 0b or 0B for binary (0b11110000), and 0o or 0O for octal (0o377). This tool recognizes all of them, plus unprefixed digits — so you can paste 0xFF, 255, 0b11111111, or 0o377 and get every other representation instantly.

Every hex digit maps to exactly four binary bits: 0=0000, 1=0001, 2=0010, …, 9=1001, A=1010, B=1011, C=1100, D=1101, E=1110, F=1111. So 0x3A becomes 0011 1010 in binary — just replace digit by digit. This one-to-four mapping is why hex is the natural way for humans to read binary data.

Yes — completely free, no registration, and 100% private. Every conversion runs locally in your browser; your values are never sent to any server. The tool works offline after the page loads, so you can convert anytime.