wpaluchmits

MITS Image Optimizer is a professional image optimization toolkit for WordPress. It compresses images automatically on upload, batch-converts your entire media library to WebP and AVIF, configures Apache to serve next-gen formats automatically, and scans your site for common technical SEO issues.
<h4>Features</h4>
Auto-Compress on Upload 
Every JPG/PNG above a configurable size threshold is automatically scaled and compressed before WordPress generates its thumbnail sizes. No extra steps needed.
Bulk Compression 
Run a background batch job to compress all existing images in your media library. Progress is tracked and the job runs asynchronously — it won’t block your browser.
WebP Converter 
Batch-convert all JPG/PNG/GIF files in your uploads directory to WebP format. Runs in the background using WP-Cron or a loopback HTTP request. Supports both Imagick and GD libraries.
AVIF Converter 
Convert images to AVIF — the next-generation format that can be 30–50% smaller than WebP. Requires Imagick 7+ with AVIF support or PHP 8.1+ with GD <code>imageavif()</code>. The plugin detects support automatically and warns you if AVIF is unavailable on your server.
Apache .htaccess Configuration 
One click adds <code>mod_rewrite</code> rules to your <code>.htaccess</code> so Apache automatically serves <code>.webp</code> files to browsers that support them, with no code changes required in your theme.
Image Dimensions Scanner 
Detects images ≥ 1600 px wide that are used in posts or as featured images. Helps you find oversized images that slow down page loads, along with their file sizes, dimensions, and WebP/AVIF conversion status.
Site Audit 
Scans your site for the most common technical issues: missing alt text, oversized images, missing SSL, outdated plugins, pages without Open Graph tags, and more. Results include actionable recommendations.
Dashboard Widget 
A compact stats panel on the WordPress admin dashboard showing compression savings, WebP/AVIF conversion counts, and a link to the optimizer.
<h4>Requirements</h4>
<ul>
<li>PHP 8.0+, WordPress 6.0+</li>
<li>GD or Imagick PHP extension (for WebP/compression)</li>
<li>Imagick 7+ with AVIF or PHP 8.1+ GD (for AVIF conversion)</li>
<li>Apache + <code>mod_rewrite</code> (for automatic WebP serving via <code>.htaccess</code>)</li>
</ul>
Developed and maintained by <a href="https://mits.pl" rel="nofollow ugc">MITS</a> — a Polish web agency specializing in WordPress performance and development.
<h4>Privacy</h4>
This plugin does not collect any personal data and does not make any external HTTP requests.

MITS Image Optimizer

Auto-compress images on upload, bulk convert to WebP & AVIF, manage .htaccess WebP serving, and audit your site — all in one plugin.

iLovePDF

Compress your PDF files and Stamp Images or text into PDF files. This is the Official iLovePDF plugin for WordPress. You can optimize all your PDF and stamp them automatically as you do in ilovepdf.com.
<h4>How it works</h4>
The plugin has two modes of work, automatic or manual. 
Compress PDF: Every time a PDF file is uploaded to your Media Library, is compressed by our iLovePDF API and saved in your WordPress site already optimized, saving you disk space. This feature can be disabled.
It can also compress all PDF already in your Media Library at once or compress PDF files one by one. The compression ratio depends on the PDF but on average you can save up to 50% of disk space occupied by PDF files without loosing quality.
Watermark PDF: Every time a PDF file is uploaded to your Media Library, is stamped by our iLovePDF API and saved in your WordPress. This feature can be disabled. 
It can also stamp images or text in PDF already in your Media Library at once or stamp PDF files one by one.
<h4>Bulk actions</h4>
All tools can be done for an individual files or applied to all your existing files.
<h4>Automatic process</h4>
All tools can be applied automatically when a PDF file is upload, so you don’t need to apply any manual anymore.
<h3>Configure your iLoveAPI Developer Account</h3>
Install this plugin and go to <code>Settings -> iLovePDF</code> to create your iLoveAPI Developer account (if you already registered previously on <a href="https://iloveapi.com" rel="nofollow ugc">iLoveAPI Developer</a> you can login directly) and choose your Project, but by default it will be selected Default Project. A project is what defines which API keys will be used. If you need it, you can manage your projects in your iLoveAPI developer account. With your iLoveAPI Free account you get 2500 free credits to process per month. If you need more you can purchase them
By going to <code>Settings -> iLovePDF -> Compress PDF</code> you can set the compression level you prefer to optimize your PDF files. We strongly recommend you to use ‘Recommended Compression’ which offers the perfect balance between compression and quality. In this section you can disable the auto compression of new uploaded PDF files in your Media Library.
By going to <code>Settings -> iLovePDF -> Watermark PDF</code> you can set many options on what to stamp and how into your PDF files. In this section you can disable the auto stamping of new uploaded PDF files in your Media Library.
To Compress or Stamp PDF files that are already in your Media Library go to <code>Media -> iLovePDF -> Compress PDF or Media -> iLovePDF -> Watermark</code>

PDF Compressor & Watermark – iLovePDF

works well

Best PDF compress plugin

Optimize and protect your PDFs with automatic compression and watermarking. Save space and secure your documents effortlessly.

MITS Image Optimizer vs PDF Compressor & Watermark – iLovePDF