Scripts for decompressing gzip/DEFLATE data, plus scripts for decoding base64 data (including base64-encoded data URLs) The project is mostly a demonstration, and takes base64-encoded gzip or DEFLATE data, decompresses it, and displays the decompressed data as text (Also TBH I mostly made this for fun; I'm not sure how useful it could actually be, since in order to use it you have to get the binary data into Scratch in the first place)
If you want *compression*, I also have this project: https://scratch.mit.edu/projects/206098651/ Also see ZHLZ, a text compression format I created: https://scratch.mit.edu/projects/490870154/