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Why do they only mention opaque web services, not the many different tools you can use yourself and that those web services probably use anyway?

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What exactly do you have in mind? I am not sure if I understand your question? What exactly do you use yourself?

pngcrush, guetzli etc.

We focused in the online tools only, because otherwise you have to split by OS etc.

And in the desktop tools you usually have more control over the quality which makes it impossible to compare to each other.

btw I tried guetzli a while ago, it was a joke. Lots of hype, much worse results compared to tinypng for example. And it took minutes to process 2 mpix image on MBP.

probably because the article itself says it is the ultimate guide to image optimization for wordpress.

Indeed. That explains it. So the HN submission title is misleading. I was simple expecting something else.

Most of the article is platform-agnostic, because in the first part it covers the image formats, resizing down the the viewport/container and the online tools. None of that has to do a thing with WP. The last part only are WP plugins. You can skip that part easily :)

the online tools part I would take as being given such importance because of WP.

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