In computing, bit twiddler may refer to:

A programmer who writes bit twiddlers, as described above

Being unnecessarily complex, perhaps due to premature optimization

A piece of source code that does bit twiddling, which may mean:

Doing bit manipulation;

Interacting with computer hardware, especially when using a bit-banging technique;

Reading or writing binary file formats; or

Hacker, an enthusiast or a programmer with profound understanding of the fundamentals of computer operation, compare to the chess term wood pusher

Hex editor, a software application that allows the manipulation of binary computer files