WebToolsPlanet
Developer Tools

Reverse Hex

Enter a hex string to instantly reverse its byte order — useful for little-endian to big-endian conversions and binary data inspection.

Last updated: May 30, 2026

Client-Side Processing
Input Data Stays on Device
Instant Local Execution

Find this tool useful? Support the project to keep it free!

Buy me a coffee

What is Reverse Hex?

Different computer architectures and network protocols store multi-byte values in different byte orders (endianness). Big-endian systems store the most significant byte first; little-endian systems store the least significant byte first.

Reversing a hex string's byte order is a fundamental operation when: - Reading binary files created on a different-endian architecture. - Converting network byte order (big-endian) to host byte order (little-endian) for x86 systems. - Debugging binary data in hex dumps where the byte order is unexpected.

For example, the hex value C0A80101 (192.168.1.1 in big-endian) becomes 0101A8C0 after a byte-order reversal.

This tool works on pairs of hex digits (bytes) — the smallest addressable unit — swapping the sequence of bytes while keeping each byte's internal nibble order intact.

How to Use Reverse Hex

1

Type or paste your hex string in the input field (with or without 0x prefix).

2

The byte-reversed output appears instantly.

3

Use the copy button to copy the reversed hex with or without the 0x prefix.

4

Click "Load Sample" to see an example.

Common Use Cases

  • Converting little-endian hex values from Windows registry or binary files to big-endian.
  • Reversing network packet byte order for protocol analysis.
  • Preparing hex values for assembly language or embedded systems code that expects a specific byte order.
  • Debugging binary data structures where fields are in unexpected byte order.

Example Input and Output

The hex value C0A80101 (big-endian for 192.168.1.1) reversed to byte order 0101A8C0.

Hex Input
C0A80101
Byte-Reversed Hex
0101A8C0

Data Privacy

All conversions run entirely in your browser. No hex data is sent to any external server.

Frequently Asked Questions

What is byte-order reversal (endian swap)?
Endian swap reverses the order of bytes in a multi-byte value. For a 4-byte hex value AABBCCDD, the byte-swapped result is DDCCBBAA. Each individual byte (two hex digits) stays intact; only the order of the bytes changes.
What happens if I enter an odd number of hex digits?
An odd number of hex digits cannot form complete bytes. This tool pads the input with a leading zero to make it even before reversing, so "FFF" becomes "0FFF" → reversed "FF0F".
Is this the same as reversing the string character by character?
No. Character reversal of "AABB" gives "BBAA", which is the same result only by coincidence for 2-byte values. For longer values like "AABBCC", character reversal gives "CCBBAA" while byte reversal gives "CCBBAA" — they happen to match here. But for "AABBCCDD", character reversal gives "DDCCBBAA" which equals byte reversal only if each byte is 2 chars. The byte-reversal approach is always safe and correct.

Related Tools

Hex to Binary Converter
Convert hexadecimal numbers to binary (base 2), decimal, and octal. Supports 0x prefix and arbitrarily large hex values.
Hex to Decimal Converter
Convert hexadecimal numbers to decimal (base 10), binary, and octal. Accepts 0x prefix. Uses BigInt for large values.
Hex to Octal Converter
Convert hexadecimal numbers to octal (base 8), decimal, and binary. Accepts 0x prefix. Uses BigInt for arbitrarily large values.
Binary to Hex Converter
Convert binary numbers (base 2) to hexadecimal (base 16). Also shows decimal and octal equivalents. Supports large binary numbers with BigInt precision.
Decimal to Hex Converter
Convert decimal numbers (base 10) to hexadecimal (base 16). Also shows binary and octal equivalents. Supports large numbers with BigInt precision.
301 Redirect Code Generator
Generate redirect code for Apache (.htaccess), Nginx, IIS (web.config), PHP, HTML meta refresh, and JavaScript. Supports 301, 302, 307, and 308 status codes.