Reverse Hex Nibbles
Quickly reverse the order of digits in a hex number. Runs entirely in your browser, so your data never leaves your device.
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Output
The result appears here as you type.
How to use Reverse Hex Nibbles
- 1. Paste the hex to flip. Enter a hex number such as abcd into the input pane. The whole digit sequence will be mirrored end to end, so the last nybble becomes the first.
- 2. Use Separator for multiple values. Set Separator when the input carries several numbers, like a space-delimited list. Each value reverses independently, so ab cd becomes ba dc rather than the entire line flipping as one string.
- 3. Copy the mirrored output. Copy the reversed digits, abcd rendered as dcba, from the output pane. Applying the tool a second time restores the original, since mirroring is its own inverse.
When to use Reverse Hex Nibbles
Reverse Hex Nibbles mirrors the digit order of a hex number, turning abcd into dcba. Note this reverses individual nybbles, not byte pairs, which distinguishes it from an endianness swap. It comes up in decoding nibble-reversed fields, exploring palindromic values and undoing reversed transmission order.
- Decoding nibble-reversed BCD fields. Some SIM card and telecom formats store phone digits in swapped nibble order. Reversing the digit string is a quick first step when a decoded number reads backwards.
- Diagnosing a string-reversal bug. A junior developer's serializer built hex output by prepending instead of appending characters. Reversing the garbled values here confirms the data itself is intact before you fix the loop.
- Hunting palindromes in identifiers. For a fun data quality check, reverse a column of hex IDs and compare with the originals. Matches are palindromic values worth flagging in your uniqueness analysis.
Examples
Reverse digits
Input
abcd
Output
dcba
About the Reverse Hex Nibbles tool
Reverse Hex Nibbles does its work locally, right in the browser. Quickly reverse the order of digits in a hex number. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the Hex Tools collection on EditSafely, a set of 108 small, focused Hex utilities that share the same instant, private workspace.
You can shape the output with the Separator setting, and the result refreshes the moment you change it. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Is Reverse Hex Nibbles 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.