Is there a way in WordPress to convert images to WebP without a plugin?

Question

I’m building a simple WordPress theme for personal use. Speed is important.
My Google PageSpeed Score is high, but it keeps saying that I should use WebP, rather than JPG. (‘modern web formats’).

As I’ve built my theme completely from scratch, so that it only contains the bare necessities and no other unneeded things.

I would very much like not to use a plugin for this, but do it myself. So I came up with the following:

  1. Upload JPG/PNG
  2. WordPress creates all the image sizes twice: once in JPG/PNG (the original format) and once in WebP
  3. When the page is loaded, I check whether to call the WebP version (when the browser supports it) or the original.

I already Googled a lot about webp in WordPress, but I only found out about plugins. I found this unanswered question with sample code for converting JPG/PNG to WebP, but I don’t know if this is really correct. To me it seems like only the extension is changed. Does anybody know if that’s also correct?

How do I add image sizes that convert to WebP?

Many thanks in advance!

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ralphsmit 2 months 0 Answers 13 views 0

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