Little-Endian Hex to Decimal Converter

The Little-Endian Hex to Decimal Converter reverses the byte order of the hex you paste into Hex Input (little-endian bytes) before reading it as a number — the way little-endian systems like x86 actually store values in memory. Click Convert and the correct decimal number appears in Decimal Output. The fastest way to turn a calendar date into a hex timestamp is the date to hex converter, with an option to output uppercase letters.

What Little-Endian Means for Hex to Decimal Conversion

Byte Order, Endianness, and Why It Changes the Decimal Result

Endianness is simply the order in which a multi-byte value's individual bytes are stored or transmitted. In little-endian order, the least significant byte comes first; in big-endian order, the most significant byte comes first. A regular hex-to-decimal conversion assumes the bytes are already in the normal reading order (big-endian, left to right). A little-endian hex to decimal converter does one extra step first: it reverses the byte pairs before doing the math, because that's how the bytes were actually laid out in memory or on the wire. Type a sentence into the text to binary converter and it writes out the binary code point behind every character instantly.

Same bytes, different order, different number. 12 34 read directly is 0x1234 = 4660. But if those two bytes were stored little-endian, the value they represent is what you get after reversing them to 34 12 → 0x3412 = 13330. Getting the order wrong silently produces a completely different — and wrong — decimal result.

Where Little-Endian Byte Order Actually Shows Up

Intel and AMD x86/x64 processors are little-endian, so any raw memory dump, register snapshot, or debugger byte view taken from a Windows, Linux, or macOS machine on that hardware stores multi-byte integers this way. Many ARM systems are bi-endian but run little-endian in practice on most consumer devices. This matters directly for reverse engineering: binary file formats, save files, and raw structures dumped from a little-endian process all need their multi-byte fields reversed before the bytes mean anything as a decimal number, and some network protocols deliberately specify byte order per field rather than assuming one convention throughout.

Table 1: Same Hex Bytes, Read Two Ways

Reading order	Bytes as stored	Combined hex	Decimal value
Big-endian (read as-is)	12 34 56 78	0x12345678	305419896
Little-endian (reverse first)	78 56 34 12	0x12345678 (after reversing)	305419896

Infographic showing how to convert little-endian hex 3412 to decimal: split into bytes 34 and 12, reverse the byte order to get 1234, then read that as decimal 4660 — Little-Endian Hex to Decimal Converter: 3412 = 4660

How This Little-Endian Hex to Decimal Converter Works

Paste Your Little-Endian Hex Bytes into Hex Input

Type or paste the raw bytes exactly as you found them — in Hex Input (little-endian bytes) — for example 34 12 or 78563412, spaces optional. This converter always treats what you enter as little-endian bytes; there's no format toggle to set, because reversing the byte order first is the one thing this tool does.

The Converter Reverses the Byte Order for You

Internally, the tool splits your input into byte pairs, reverses their order, and joins them back into a single hexadecimal number — the same manual process you'd otherwise do by hand:

// What the converter does internally
function littleEndianHexToDecimal(hexStr) {
  const bytes = hexStr.replace(/\s+/g, "").match(/.{1,2}/g); // split into byte pairs
  const reversed = bytes.reverse().join("");                  // reverse byte order
  return BigInt("0x" + reversed);                              // read as decimal
}

For an n-byte little-endian value made of bytes $b_0, b_1, \ldots, b_{n-1}$ (in the order you typed them), the resulting decimal value is:

$$ \text{Decimal} = \sum_{i=0}^{n-1} b_i \times 256^i $$

Read the Result in Decimal Output

Conversion happens live as you type — press the Convert button if you prefer, or just watch Decimal Output update — and a Copy button lets you grab the result without selecting the text by hand. There's no byte-width or signed/unsigned option to configure: enter as many byte pairs as your value actually has, and the converter reverses and reads exactly what you gave it.

Worked Examples: Little-Endian Hex to Decimal in Practice

Example 1 — A 2-Byte Value

You've read the raw bytes 34 12 from a little-endian source:

Hex Input: 34 12
Byte order reversed: 12 34
Read as hex: 0x1234
Decimal Output:

$$ 0\text{x}1234 = 1 \times 16^3 + 2 \times 16^2 + 3 \times 16^1 + 4 \times 16^0 = 4660 $$

Example 2 — A 4-Byte Value from an x86 Memory Dump

A debugger shows the raw bytes 78 56 34 12 at a memory address on an x86 machine:

Hex Input: 78 56 34 12
Byte order reversed: 12 34 56 78
Decimal Output: 305419896

Little-Endian vs. Big-Endian: The Core Difference

Regular hex-to-decimal conversion and little-endian hex-to-decimal conversion use the exact same math once the bytes are in the right order — the only difference is that one extra reversal step. Regular hex-to-decimal reads the digits left to right as normal, the way you'd read any hexadecimal number. Little-endian conversion first reverses the byte order (pairs of hex digits), which matters specifically when you're reading raw memory dumps or binary file formats produced by little-endian systems like x86 — skip that step and you'll get a real, valid-looking decimal number that's simply wrong.

When You'll Reach for a Little-Endian Hex to Decimal Converter

Reverse engineering: decoding raw bytes pulled from a disassembler, hex editor, or memory dump on an x86/x64 system.
Low-level and embedded programming: checking that a multi-byte value you wrote to memory or a buffer reads back as the number you expect.
Binary file format analysis: many file formats store integer fields in little-endian order; converting a raw hex dump of those bytes to decimal requires reversing them first.
Network protocol debugging: some protocol fields are defined as little-endian rather than the "network order" (big-endian) default, so a captured hex field needs the same reversal before it means anything as a number.

Frequently Asked Questions

What's the difference between this and regular hex-to-decimal?

Regular hex-to-decimal reads digits left to right as normal. Little-endian conversion first reverses the byte order (pairs of hex digits), which matters when reading raw memory dumps or binary file formats from little-endian systems like x86.

Does this tool send my data anywhere?

No, runs entirely client-side.