Maor Chasen

Winsite

AmitT

Winsite Image Optimizer will compress your images for optimal file-size while keeping its quality (pretty much) intact, using the ImageOptim API (and other processing engines coming up soon).
You can also process all of your old images retroactively using our dedicated tool, found under the Media section.
Currently-implemented Image Processing Services:
<ul>
<li><a href="https://imageoptim.com/api" rel="nofollow ugc">ImageOptim</a> (You’ll need to obtain an <a href="https://im2.io/register" rel="nofollow ugc">API key</a>)</li>
<li>Send your suggestions on our <a href="https://github.com/win-site/winsite-image-optimizer/issues" rel="nofollow ugc">GitHub issue tracker</a>.</li>
</ul>
Warning: This won’t work on localhost in some cases, since some services work in a way that they pull images in from your site. This is why you’ll need a public URL in order to make this work locally. 
You can use a service such as ngrok to achieve that, in conjunction with this filter:
<pre><code>add_filter( 'wsi_siteurl_override', function( $siteurl ) {
 return 'http://ae190611.ngrok.io/path-to-wp-installation/';
} );
</code></pre>
We’d love to recieve contributions / suggestions from you on our <a href="https://github.com/win-site/winsite-image-optimizer/" rel="nofollow ugc">GitHub project</a>.

Winsite Image Optimizer

Better optimization it's so important for websites. This useful plugin work out of the box with minimum attention and maximum optimization.



Work like a charm!

I have been looking for a reliable image compression tool for WordPress for a long time.. Finally found this one that actually does what it should and does it great. Big shout out to the developers!!!



Awesome !

I can't recommend this plugin as it changed lots of file names and duplicated images.

With some regex I managed to get rid of some of its damage, but with large sites this would have been a nightmare

I would say avoid this plugin to be safe, there are better plugins out there for image compressions

Changed all image file names + weird redirects

The plugin worked good and I've been using it for two years. Some of it's functions are basic and it does rename images, which has been a nuisance for me. I had to use another plugin - Media file rename to remove wsi-imageoptim- prefix from filenames (Google uses image filenames for indexing). But there is a saying: you don't look in teeth a horse which was given to you for free. Therefore three stars.

helpful

Image compression for WordPress done right.

altomatic

The only WordPress plugin that combines image compression AND AI alt text generation in one.
Stop juggling multiple plugins. Altomatic automatically compresses your images to WebP and AVIF formats while generating accurate, SEO-optimized alt text using AI—all in a single upload.
<h4>Why Altomatic?</h4>
<ul>
<li>2-in-1 Solution – Image compression + alt text generation in one plugin (no need for separate tools)</li>
<li>Improve Core Web Vitals – Smaller images = faster LCP scores</li>
<li>Better SEO – AI-written alt text helps Google understand your images</li>
<li>SEO Plugin Integration – Uses focus keyphrases from Yoast SEO, Rank Math, and AIOSEO for keyword-rich alt text</li>
<li>Accessibility Compliance – Auto-generated descriptions for screen readers (EAA/ADA/WCAG)</li>
<li>WebP & AVIF Support – Next-gen formats with automatic browser fallback</li>
</ul>
<h4>Perfect For</h4>
<ul>
<li>WooCommerce stores – Optimize product images for faster load times and better product SEO</li>
<li>Bloggers & content creators – Focus on writing, not image optimization</li>
<li>Agencies – Bulk optimize client sites with one tool</li>
<li>Sites needing accessibility compliance – Meet EAA, ADA, and WCAG requirements automatically</li>
<li>Anyone who wants to pass Core Web Vitals – Fix image-related performance issues automatically</li>
</ul>
<h4>The Only All-in-One Solution</h4>
Most image optimization plugins only compress images. Most alt text plugins only generate descriptions. Altomatic does both, saving you money and simplifying your workflow.
<ul>
<li>Image Compression – Yes (compression-only plugins can’t generate alt text)</li>
<li>WebP/AVIF Conversion – Yes (alt text-only plugins can’t convert formats)</li>
<li>AI Alt Text Generation – Yes (compression-only plugins don’t do this)</li>
<li>Single Plugin – Yes, no need to install and pay for 2 separate tools</li>
</ul>
<h3>Key Features</h3>
Automatic Alt Text Generation 
Every uploaded image is analyzed by AI and descriptive, SEO-friendly alt text is automatically added to the image properties. No manual work required — just upload and go.
Image Compression & Format Conversion 
Compress images and convert to modern WebP and AVIF formats for dramatically smaller file sizes. The only alt text plugin that also optimizes your images — no second plugin needed.
Keyword-Rich Alt Text with SEO Plugin Integration 
Seamlessly integrates focus keyphrases from popular SEO plugins, including Yoast SEO, Rank Math, and All in One SEO (AIOSEO), to generate keyword-rich alt text that aligns with your on-page SEO strategy.
Optimized for WooCommerce 
Automatically optimizes WooCommerce product images, thumbnails, and gallery images. AI-generated alt text helps your products appear in Google Image Search and improves product page SEO.
Supports Multiple Formats 
Handles JPG, PNG, WebP, and AVIF images. Convert to next-gen formats with automatic browser fallback for maximum compatibility across all devices.
Bulk Optimization 
Use the bulk optimization tool to process your entire existing media library. Optimize hundreds of images and generate alt text with one click.
Core Web Vitals Ready 
Smaller images directly improve your Largest Contentful Paint (LCP) score — one of Google’s key ranking factors. Fix image-related performance issues automatically.
Accessibility Compliance 
Auto-generated alt text helps meet EAA, ADA, and WCAG 2.1 requirements for image descriptions. Support screen readers with accurate, meaningful image descriptions on every page.
Multiple Languages 
AI alt text generation supports multiple languages, so your image descriptions match your site’s language.
Review and Edit 
See what was processed and manually edit or regenerate the AI-generated alt text at any time. Full control over your image descriptions.
Try for FREE 
50 free credits every month. No credit card needed to get started.
<h3>Configuration</h3>
<ol>
<li>Go to <code>Settings > Altomatic</code></li>
<li>Click “Get API Key” – enter your email and a 6-digit verification code will be sent to you. Enter the code and your API key is saved automatically. Or paste an existing key from <a href="https://altomatic.ai/profile" rel="nofollow ugc">altomatic.ai/profile</a>.</li>
<li>Customize your settings:
<ul>
<li>Select image sizes to optimize</li>
<li>Choose output formats (WebP/AVIF/original)</li>
<li>Enable automatic alt text generation</li>
<li>Configure responsive image settings</li>
</ul>
</li>
</ol>
Free plan includes 50 credits/month. <a href="https://altomatic.ai/profile" rel="nofollow ugc">Upgrade your plan</a> for more.
<h3>External Services</h3>
This plugin connects to the Altomatic API (https://api.altomatic.ai) to perform image optimization and alt text generation. Your images are uploaded only during processing and are never made public or shared.
This plugin also connects to the Altomatic web application (https://altomatic.ai/api) for account authentication when using the “Get API Key” feature. This sends your email address to request a verification code and retrieve your API key.
See <a href="https://altomatic.ai/terms" rel="nofollow ugc">terms of use</a> and <a href="https://altomatic.ai/privacy" rel="nofollow ugc">privacy policy</a> for more details.
<h3>Support & Contact</h3>
<ul>
<li>Website: <a href="https://altomatic.ai" rel="nofollow ugc">https://altomatic.ai</a></li>
<li>Support Email: support@altomatic.ai</li>
</ul>

Altomatic – 2-in-1 AI Image Optimization & Alt Text tool for speed, SEO, and accessibility

Compress images to WebP/AVIF and auto-generate SEO alt text with AI. Boost Core Web Vitals, page speed, and accessibility automatically.

Winsite Image Optimizer vs Altomatic – 2-in-1 AI Image Optimization & Alt Text tool for speed, SEO, and accessibility