From here, you may upload JPG images or ZIP archives containing JPG images.
Briefly, but clearly, identlfy who you are, what images you are uploading, and why:
On Windows ...
Add your jpg images to a folder, then right click on the folder and select "Send to > Compressed (zipped) folder". You will end up with both the original and a zipped copy.
Add your jpg images to a folder, then right click on the folder and select "Send to > Compressed (zipped) folder". You will end up with both the original and a zipped copy.
On a Mac...
Add your jpg images to a file, then just CTRL-click on the file and select "Create Archive". You will also find the option in the File menu. Either way, you will end up with both the original and a zipped archive copy.
Add your jpg images to a file, then just CTRL-click on the file and select "Create Archive". You will also find the option in the File menu. Either way, you will end up with both the original and a zipped archive copy.