Which WordPress plugin is best for free image optimization?

I used to use EWW Image Optimizer but I just noticed that it's paid now, so it's out of the question I guess...

I think Litespeed Cache had image optimization function, but I don't remember. But if it does, you can use that (since you need a caching plugin anyway). Or maybe Deleted member 752298 knows of a free one...
 
I always photoshopped it then upload, what's the advantage use a plugin? It can automate the process? But I guess it will increase the file numbers and hosting size right?
 
You can use Short Pixel, which is very effective.
 
There are several free plugins available for image optimization on WordPress. Here are some popular options: Smush, ShortPixel Image Optimizer,Imagify,Optimole,EWWW Image Optimizer
 
What's the difference between shortpixel & Bunny Optimizer paid plans?

Shortpixel is using bunny in the backend.
 
I use the source to minify before upload.
Example before download at canva.
Or else.
I use site called
Image resizer
Works everytime.
 
I also used to use EWWW now I use Modern Image Formats from Automatic, this plugin is supposed to become a part of Wordpress at which point you can remove the plugin (they sure will check for the plugin once the code lives inside WP so no worries)

It creates web versions and puts them into your pages if using the WP media uploader, and you can set the quality, e.g. 80

I prepare the images in relatively big size and quality with about 1 MB (instead of the original 3-8 or so MB) in Photoshop and upload them to WP. The plugin turns it into webp while uploading.

I do not reduce image quality too much as the plugin will decrease it further anyway.

The whole image handling in WordPress is quite a task if you wanted to do every optimisation possible (AVIF & HEIC, 2x, 3x, 4x for high res, right dimension per viewport width, art direction... oh my)
 
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