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Yes, this is a real thing. Researchers have created "zip quines"—recursive zip files that contain themselves upon extraction.

Because it is lossless , the data after decompression is exactly the same as it was before. The Secret Life of Zipped Files _ _szip

The technology, often leveraging algorithms like LZ77, works by replacing repeated data with pointers. It's already done the heavy lifting the first time. The Code Behind the Magic Yes, this is a real thing

Can you compress a zip file further? Sometimes, but you'll quickly hit a limit. The core concept is that a well-designed ZIP file is already as small as it can reasonably be, making further compression ineffective. often leveraging algorithms like LZ77