Are the files compressed with Gzip always smaller than others not compressed? [duplicate]

Recently, I enable the Gzip compression module for resources access on a server manually. Most files have gotten smaller as expected, but there is a file format that is not smaller but larger - .woff font. When I enable the Gzip module, a .woff file size with 3.2 KB. Conversely, it is only 2.1KB normally. Why do this happen?

You cannot compress every kind of data.

Compression usually adds some overhead. But it also removes redundancy. So if you have a file that doesn't have enough redundancy, the achieved compression cannot make up for the overhead introduced by the compression format.

WOFF is a compressed file type. So redundancy has already been removed.