Biggest image in the smallest space

420 bytes file that uncompresses to a 141.4 GB 225,000 × 225,000 pixels (50.625 gigapixels) PNG.

https://www.bamsoftware.com/hacks/deflate.html

Upload as your profile picture to some online service, try to crash their image processing scripts?

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This reminds me of the old gif decompression bomb attacks