Before uploading images to my blog or AI Tales, I run them through ImageMagick to resize and convert them to “web-friendly” JPGs:
convert -format jpg \ -strip \ -interlace Plane \ -set filename:base "%[basename]" \ -quality 50% *.png \ "%[filename:base].jpg"
The command converts all PNG images in a folder to JPG while preserving the filename. Even though quality is set to 50% (you can of course experience with this, I often don’t see a noticeable difference from the original — especially for images generated with AI such as Stable Diffusion.
And the size is reduced significantly. For example, I can sometimes reduce the size of PNG images by more than 90% (553kb to 39kb i a recent example).
Here are some more ImageMagick one-liners.