Decimal to Little Endian Hex Converter
Convert a decimal number into little-endian hex bytes — converts to hex first, then reverses the byte order, at your chosen byte width.
Built by
Swapnil SanghviFull-Stack Web Developer & WordPress Developer
Swapnil Sanghvi is a full-stack web and WordPress developer, UI designer, and full-time freelancer who builds and maintains Hex Calculator.
Further reading: Endianness — Wikipedia
How to Convert Decimal to Little-Endian Hex
Convert the decimal number to hex using the standard method, pad to a whole number of bytes if needed, then reverse the order of those bytes. The result is the same number, just with its bytes arranged in the order a little-endian system would store them.
Decimal to Little Endian Example, Step by Step
305,419,896 = little-endian bytes 78 56 34 12
decimal 305,419,896 -> little-endian 78563412
305,419,896 decimal = 0x12345678 Bytes: 12 34 56 78 Reversed: 78 56 34 12
| Step | Description | Result |
|---|---|---|
| Convert to hex | 305,419,896 = 0x12345678 | 12, 34, 56, 78 |
| Reverse the byte order | 12 34 56 78 -> 78 56 34 12 | 0x78563412 |
This is the exact byte sequence you'd write into a file or memory buffer on a little-endian system to represent 305,419,896.
Where This Actually Comes Up
Constructing a Little-Endian Binary File by Hand
Building a test binary file field by field (for testing a parser, or reverse engineering a format) means writing each integer value in the byte order the format expects.
write a 4-byte little-endian length field
Writing a Test Fixture for a Little-Endian Parser
Generating a known, predictable little-endian byte sequence for a chosen decimal value gives you an exact input to verify your parsing code produces the correct decoded number.
known decimal -> expected byte sequence
Cross-Checking a Value Against a Memory Dump
Confirming what byte pattern a specific decimal value should produce in memory on a little-endian system, to compare against what a debugger or memory dump actually shows.
expected bytes vs. observed memory bytes
Why Use This Calculator Instead of Doing It by Hand
- Combines the decimal-to-hex conversion and byte reversal in one step
- Pads to a whole number of bytes automatically before reversing
- Runs entirely in your browser — nothing you type gets sent anywhere
- Handles values of any size, not just a fixed 16/32/64-bit width
Limitations
- Supports non-negative decimal input only — negative numbers aren't handled, since the two's-complement byte width would need to be specified separately.
- Pads to the nearest whole byte before reversing, which may not match a specific fixed-width format's expected byte count — pad to your target width manually if needed.
Frequently Asked Questions
How do you convert a decimal number to little-endian hex?
Convert the decimal number to hex normally first, then reverse the order of its bytes (2-digit pairs). The individual byte values don't change — only their order does.
When would I need a decimal value in little-endian hex form?
When writing a value into a binary file format or memory layout that expects little-endian byte order — the storage convention most desktop and mobile CPUs (x86, ARM) use.
Why does the byte count matter for the result?
Reversing byte order only makes sense once you know how many bytes the value occupies — this tool pads the hex to a whole number of bytes (an even digit count) before reversing, so a small value doesn't reverse into a different-looking result than intended.
Is this the exact reverse of Little Endian Hex to Decimal?
Yes — converting a decimal value here and then feeding the result into Little Endian Hex to Decimal returns the original decimal number.