Swap Hex Endianness
Change endianness of a hex number. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Swap Hex Endianness
- 1. Paste the hex value. Enter a hex byte sequence such as 12345678 whose byte order you want reversed, regardless of which direction it currently runs.
- 2. Review the swap. The tool reverses the order of whole bytes, not individual digits within a byte, turning a value like 12345678 into 78563412.
- 3. Copy the swapped result. Copy the byte-reordered value into code, a protocol field or a debugger where you need the opposite endianness from what you started with.
When to use Swap Hex Endianness
Swap Hex Endianness flips the byte order of a hex value from little-endian to big-endian or back, whichever direction applies. It is for the many situations in low-level programming where a multi-byte value needs to move between systems or protocols with different native byte orders.
- Fixing a value read incorrectly across platforms. A 32-bit value looks wrong after being read on a system with the opposite endianness from where it was written, and swapping the byte order restores the expected number.
- Preparing a value for a specific file format. A file format spec requires a field in one byte order but your working value is in the other, so you swap it before writing it into the file.
- Checking a suspected byte-order bug. Two systems disagree on a shared numeric value, and swapping the endianness of one side's hex bytes quickly confirms whether a byte-order mismatch is the culprit.
Examples
Swap byte order
Input
12345678
Output
78563412
Pad odd length
Input
abc
Output
bc0a
About the Swap Hex Endianness tool
Swap Hex Endianness runs as plain JavaScript in your browser tab, with no server behind it. Change endianness of a hex number. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's Hex Tools section, 108 single-purpose utilities built around the same idea: open the page, get the result, keep your data to yourself.
There is nothing to configure. Provide the input and the result appears on its own. 2 worked examples further down the page show exactly what the tool produces for real inputs.
That local-first design has practical benefits beyond privacy. The tool keeps working on a flaky connection once the page has loaded, results are instant because nothing round-trips to a server, and it is safe to use with confidential material.
Frequently asked questions
Is Swap Hex Endianness free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.