R3dRidl3

This plugin will optimize your images exactly like Google Pagespeed Insights
This plugin is for all those people who are struggling with Google saying their images can be optimized better.
We make use of the Google PageSpeed API. Therefor it has the exact same compression as Google PageSpeed. It just works out of the box (if API key is set).
The best of it, we do NOT make the image a lower quality one! 
The plugin will NOT resize images! If your theme serves image too big and resizes them by simply scaling it with CSS than there is a change it will not optimize as you might think!
If you want a demonstration for a specific image, just ask me and I will upload it in my site and show you the results.
For the premium version check <a href="https://codecanyon.net/item/wp-google-pagespeed-insights-image-optimizer/20596917" rel="nofollow ugc">WP Google PageSpeed Insights Image Optimizer Pro</a>
Here you get:
<ul>
<li>Bulk optimize</li>
<li>Backup your originals</li>
<li>Restore originals</li>
<li>Optimize theme images</li>
<li>Before / after slider (see the comparison)</li>
</ul>

WP Google PageSpeed Image Optimizer Lite

This is the best plugin by far. Google Pagespeed will nog bother you anymore with images that are not compressed enough.

Previous plugins did optimize, bug Google Pagespeed always said it could improve more.
With this plugin this is gone.

Best image compression plugin by far!

Best plugin for Google Pagespeed

I’m looking for an optimization plugin that can bring image sizes down to Google PageSpeed suggested size. I don't know what the deal is, but even with this plugin using the official API my image is still 30% larger than PageSpeed wants.

Testing with a 193kb jpg (700×467):

Smush Image Compression and Optimization: 145kb (24.8%)
Imagify: 145kb (24.8%)
Compress JPEG & PNG images (by TinyPNG): 145kb (24.8%)
EWWW Image Optimizer: 101kb (47.6%)
WP Pagespeed by R3dRidl3: 99kb (48.7%)
Google PageSpeed: 69kb (64.2%)

Still searching for a better solution…

Good, but still not as good as pagespeed

This plugin will optimize your images exactly like Google Pagespeed Insights This plugin is for all those people who are struggling with Google sayin …

Raffael Jesche

Automatically optimize uploaded images (jpg, png, gif, webp, svg, avif) using the <a href="https://github.com/spatie/image-optimizer" rel="nofollow ugc">Spatie image-optimizer library</a> and binary files on your host system.
New uploaded images with all image sizes (thumbnails) will be optimized automatically.
Previously uploaded images can be updated in two ways:
<ol>
<li>Use the command line interface (cli) and run <code>wp media regenerate</code>, which also triggers the optimization chain. If you don’t have cli access, some other plugin, that regenerates existing thumbnails should work, too (not tested, yet).</li>
<li>The media library has a new column “File size” in the list view, which displays the new and the old file size. If an image is not optimized, there is a link named “Optimize” to run the optimizer directly.</li>
</ol>
Warning: Images are replaced with the optimized ones. Create a backup before testing this plugin. If this is a deal-breaker for you, don’t use it.
Important: If the needed binary files aren’t installed, this plugin won’t optimize anything. Don’t use it, if you don’t know, how to install them or if your web hoster doesn’t provide them.
Notice: WordPress has no support for SVG files. Technically this plugin can optimize them, but I didn’t run any tests with plugins, that add SVG support to WordPress. I was able to optimize svg files automatically in a local test setup (see <a href="https://codeberg.org/raffaelj/wordpress-another-simple-image-optimizer/src/branch/main/tests/prepare-and-run-tests.sh" rel="nofollow ugc"><code>prepare-and-run-tests.sh</code> in the tests folder</a> and search for <code>enable_svg_avif_upload</code>).
For more information and notes about development, checkout the <a href="https://codeberg.org/raffaelj/wordpress-another-simple-image-optimizer/src/branch/main/README.md" rel="nofollow ugc">project README.md file on Codeberg</a>
<h3>Requirements</h3>
<ul>
<li>PHP function <code>proc_open</code> must be enabled (some web hosts disable it via <code>php.ini</code>)</li>
</ul>
<h3>Settings</h3>
Quality settings can be adjusted with constants in <code>wp-config.php</code>:
Set quality for resizing images (GD/Imagick)
<ul>
<li><code>define('ASIO_RESIZE_QUALITY_JPEG', 100); // default: 82</code></li>
<li><code>define('ASIO_RESIZE_QUALITY_WEBP', 100); // default: 86</code></li>
</ul>
Set quality of optimizers
<ul>
<li><code>define('ASIO_QUALITY_JPEGOPTIM', 90); // default: 85</code></li>
<li><code>define('ASIO_QUALITY_PNGQUANT', 90); // default: 85</code></li>
<li><code>define('ASIO_QUALITY_CWEBP', 85); // default: 90</code></li>
<li><code>define('ASIO_QUALITY_AVIFENC', 70); // default: 63</code></li>
</ul>
<h3>Optimization tools</h3>
Spatie image-optimizer will use these optimizers if they are present on your system:
<ul>
<li><a href="https://github.com/tjko/jpegoptim" rel="nofollow ugc">JpegOptim</a></li>
<li><a href="http://optipng.sourceforge.net/" rel="nofollow ugc">Optipng</a></li>
<li><a href="https://pngquant.org/" rel="nofollow ugc">Pngquant 2</a></li>
<li><a href="https://github.com/svg/svgo" rel="nofollow ugc">SVGO 1</a></li>
<li><a href="http://www.lcdf.org/gifsicle/" rel="nofollow ugc">Gifsicle</a></li>
<li><a href="https://developers.google.com/speed/webp/docs/precompiled" rel="nofollow ugc">cwebp</a></li>
<li><a href="https://github.com/AOMediaCodec/libavif/blob/main/doc/avifenc.1.md" rel="nofollow ugc">avifenc</a></li>
</ul>
At least jpegoptim and optipng should be installed.
You can find information about how to install the binary files in the <a href="https://github.com/spatie/image-optimizer#optimization-tools" rel="nofollow ugc">Spatie image-optimizer README.md file</a>.

Another simple image optimizer

Automatically optimize uploaded images using the Spatie image-optimizer library and binary files on your host system (e. g. jpegoptim, optipng)

WP Google PageSpeed Image Optimizer Lite vs Another simple image optimizer