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Seven JPG files with extreme shapes: jpg_1x1, jpg_10000x1, jpg_1x10000, jpg_10000x100, jpg_100x10000, jpg_65500x1 and jpg_1x65500. The JPEG format allows up to 65535 pixels on a side, and these files get close to that with a single row or column, so they stay below 18 KB. They test oversized image protection in decoders, resizers and thumbnail makers. The very thin ones also catch code that assumes pictures are roughly square or landscape. Upload them to your system and check that it either processes them quickly and safely or declines with a clear message.