Reverse Hex Digits

Reverse hexadecimal digits and byte orders online. Perform big-endian to little-endian byte swaps, invert individual nibbles, or reverse 16-bit word boundaries with 0x prefix support.

Private • In-browser processing • Zero server uploads

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How to Use Reverse Hex Digits

1
Enter Hex String
Paste your hexadecimal data (e.g. '0x12345678' or '48 65 6C').
2
Choose Reversal Unit
Select 'Byte' for endianness swaps or 'Nibble' for individual character flipping.
3
Copy Reversed Hex
The flipped hexadecimal sequence is generated immediately.

Key Features

Multiple Reversal Modes
Reverse by individual nibbles (1234 -> 4321), bytes/endianness (1234 -> 3412), or 16-bit words (11223344 -> 33441122).
Endianness Conversion
Effortlessly translate between Big-Endian (network byte order) and Little-Endian (x86 architecture).
Flexible Formatting
Retain or add 0x prefixes and format with spaces, colons, or continuous hex streams.
Bidirectional Reversibility
Reversing twice perfectly restores original hex byte values.

Common Use Cases

  • Converting memory values between Little-Endian (x86/ARM) and Big-Endian (Network Order) architectures.
  • Debugging low-level CPU registers, memory dumps, and disassembler outputs.
  • Parsing protocol headers where fields are encoded in inverted byte sequences.
  • Reverse engineering binary files and file format magic headers.

Frequently Asked Questions

Nibble reversal flips every single character (e.g., 0x1234 becomes 0x4321). Byte reversal keeps 2-character pairs together and swaps their positions (0x1234 becomes 0x3412), which is essential for endianness conversions.

Yes! Byte mode is designed specifically for swapping endianness across 16-bit, 32-bit, or 64-bit integer values.

Because a byte requires exactly 2 hexadecimal characters, the tool will alert you to ensure no partial nibbles are corrupted.

Hex to Text
Convert hexadecimal strings to readable ASCII or UTF-8 text.
Reverse Integer Digits
Reverse the digit order of an integer: 12345 → 54321.
Invert Binary Bits
Flip every bit in a binary string: 0→1 and 1→0 (bitwise NOT).
UTF8 to Hexadecimal
Convert UTF-8 encoded text to its hexadecimal byte representation.
IP to Hex
Convert IPv4 addresses to hexadecimal and back.