Byte Swapper
This free byte swapper reorders the bytes of a hexadecimal value to convert between big-endian and little-endian representations. It is a must-have tool when reading binary data across different architectures.
What Is Endianness?
Different computer architectures store multi-byte numbers in different orders. Big-endian systems store the most significant byte first, while little-endian systems store the least significant byte first. The same 32-bit value can therefore look completely different in memory on the two systems.
Take the value 01020304. Written big-endian it stays 01020304, but read as little-endian the same bytes are interpreted as 04030201. This byte swapper performs that reversal for 16-bit, 32-bit, and 64-bit words, or reverses the whole sequence of bytes.
- Hex input is interpreted as a series of bytes, two characters each.
- Swap 16-bit reverses each pair of adjacent bytes.
- Swap 32-bit reverses each group of four bytes.
- Swap 64-bit reverses each group of eight bytes.
- The live preview shows big-endian and little-endian forms automatically.
When You Need to Swap Bytes
Byte order matters everywhere binary data crosses a boundary: reading network packet headers, parsing file formats written on other machines, or inspecting memory dumps from embedded devices. Endianness mismatches are one of the most common silent bugs in systems programming.
Keep this byte swapper open whenever you are debugging binary data, so you can instantly see how the same bytes appear under either byte order.