You don't edit web ready images in Photoshop or any other tool.
You edit uncompressed or at least very lightly compressed high resolution images,
then compress them as jpeg, png, gif, or webP as the last step in the process.
Otherwise, you get sometimes severe quality degradation, like making a copy
of a copy of a copy of a cassette tape.
Google does this and many other things because a large percentage of web sites
run Google ads or other Google services, and a large percentage of surfers use Google.
Therefore, the more that people use the web, the more money Google makes.





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