Hex to Decimal Converter

The Hex to Decimal Converter is a free online tool that convert between hexadecimal, decimal, binary, and octal with step-by-step explanations, bigint support, and bulk mode. It runs entirely in your browser with no installation or sign-up needed.

Eight tabs: Hex↔Dec, Hex↔Bin, Dec↔Bin, Oct↔Dec. Plus an all-bases summary showing Dec/Hex/Bin/Oct simultaneously.

Yes — uses native BigInt for arbitrary precision, no 53-bit float limit.

Shows positional breakdown (e.g. A*16² + B*16¹ + C*16⁰ = 2748) for to-decimal conversions.

Yes, the Hex to Decimal Converter is 100% free with no registration, no hidden fees, and no usage limits. All processing happens locally in your browser, ensuring complete privacy.

Absolutely. The Hex to Decimal Converter processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the Hex to Decimal Converter is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the Hex to Decimal Converter in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The Hex to Decimal Converter works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

To convert hex to decimal manually, you multiply each digit by 16 raised to the power of its position, counting from zero on the right, then add the results. Hex digits A through F stand for 10 through 15. Take 1A3F: the F is 15×16⁰=15, the 3 is 3×16¹=48, the A is 10×16²=2560, and the 1 is 1×16³=4096. Adding 4096+2560+48+15 gives 6719 in decimal. The same method works for any length — each position is worth 16 times the one to its right. This tool does exactly that calculation for you and prints the full positional breakdown, showing each digit, its place value, and its subtotal, so you can check your own working or learn the pattern instead of just trusting the number.

The 0x prefix is a marker that tells a programming language, calculator, or person that the digits following it should be read as hexadecimal (base 16) rather than ordinary decimal. Without it, a value like 255 is ambiguous — in hex it would actually equal 597 in decimal. So 0xFF clearly means the hex number FF, which is 255. Similar prefixes exist for other bases: 0b marks binary (0b1010) and 0o marks octal (0o755). These conventions come from C and are now used across most languages and many config files. When you paste a value here, the converter strips a leading 0x, 0b, or 0o automatically, so you can copy numbers straight out of source code without cleaning them up first and convert them immediately.

Hexadecimal is base 16, which means each digit must represent sixteen distinct values — but we only have ten number symbols, 0 through 9. To fill the remaining six slots, hex borrows the letters A, B, C, D, E, and F to stand for the values 10, 11, 12, 13, 14, and 15. So F is the largest single hex digit, equal to decimal 15, and the next value, 16, rolls over to two digits as 10 in hex. This compact notation is why a single hex digit maps neatly onto exactly four binary bits, making hex a tidy shorthand for the binary that computers actually use. The converter accepts these letters in upper or lower case, validates that nothing outside 0-9 and A-F slips in, and shows the equivalent value in decimal, binary, and octal.

Hexadecimal is used in those places because it lines up perfectly with how computers store data in bytes. One byte is eight bits, and eight bits split cleanly into two hex digits, so any byte value fits in exactly two characters from 00 to FF. That makes hex far more readable than long binary strings while staying precise. Web colors like #FF5733 pack three bytes — red, green, and blue — into six hex digits. Memory addresses and MAC addresses use hex for the same reason: it compresses large binary values into a short, unambiguous form that maps back to bits without rounding. Converting these by hand is slow, so paste the hex value here to instantly see its decimal equivalent, view all four bases side by side, or break a color code into its component byte values.

Many online converters fail on large values because they rely on JavaScript's standard number type, which can only represent integers exactly up to 2⁵³ − 1, roughly 9 quadrillion. Beyond that limit, digits get silently rounded, so a long hexadecimal string — a 64-bit memory address, a cryptographic hash, or any oversized value — converts to a number that looks plausible but is quietly incorrect. This tool avoids the trap entirely by parsing every base with native BigInt arithmetic, which handles integers of arbitrary size with no rounding and no precision loss. Whether you convert a two-digit byte or a forty-character hex hash, the decimal result is exact. Paste your value and you get a precise answer along with the same number shown in binary, octal, and decimal, with copy buttons for each.