- Download and install GIMP on your computer
- Download your images to your computer from your phone
- Open your images in GIMP (you can mass-open a whole lot of them at once from your file manager)
- Scale them down if necessary
- Export them as WebP and/or JPEG, one by one ** Check how big WebP files get when you save them as lossless; save them as lossy only if lossless image files are too big ** If you go for JPEG, try 100% quality first, and don't go below 90%
- Directly upload these files to Lemmy (that is, I myself, in my personal position, being me and all, wouldn't necessarily do that on Lemmy)
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