Katsushi Kawamori

<h4>Generate WebP or AVIF</h4>
<ul>
<li>Generate WebP or AVIF file when adding image file in Media Library.</li>
<li>Generate WebP or AVIF from all the images by async/await.</li>
<li>Optionally, Can replace image files with WebP or AVIF when adding new media, and delete the original image file. Also, when generating all images, the original image file ID will be overwritten as WebP or AVIF and the original image file will be deleted. All URLs in the content are also replaced.</li>
</ul>
<h4>WP-CLI</h4>
<p>WP-CLI commands are available. If you have a large number of files, WP-CLI commands is more reliable.<br />
* <code>wp pluswebpavif</code><br />
* <code>wp pluswebpavif webp</code> -> Generated WebP.<br />
* <code>wp pluswebpavif avif</code> -> Generated AVIF.<br />
* <code>wp pluswebpavif help</code> -> Specification of this command.<br />
* <code>wp pluswebpavif webp mail</code> -> Send results via email.<br />
* <code>wp pluswebpavif webp replace</code> -> WebP or AVIF replacement of images and contents.<br />
* <code>wp pluswebpavif avif addext</code> -> Append the webp or avif extension to the original filename.<br />
* <code>wp pluswebpavif webp --pid=12152</code> -> Process only specified Media ID(Conversion source ID).<br />
* <code>wp pluswebpavif avif --quality=90</code> -> Specifies the quality of WebP or AVIF.<br />
* <code>wp pluswebpavif webp --types=image/png,image/gif</code> -> MIME type to convert.</p>
<h4>How it works</h4>
<span class="embed-youtube" style="text-align:center; display: block;"><iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/EIheJryR7j0?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe></span>
<h4>Filter hooks</h4>
<pre><code>/** ==================================================
 * Filter for advanced change database.
 * If you want to replace other databases besides content.
 */
add_filter(
    'plus_webp_advanced_change_db',
    function( $before_url, $after_url ) {
        /* Your processing */
        return array( $before_url, $after_url );
    },
    10,
    2
);
</code></pre>


Plus WebP or AVIF

It is very useful to replace the URLs of images of existing content as well.

Easy and very useful


I really like this plugin and it's very good in other aspects. However, on both of my websites, when converting in bulk, I was unable to continue the conversion for a certain period of time, indicating an Ajax 500 error. What is the reason?


500 error


This is great plugin to save my server space!



Dear developer, I prefer to donate by paypal, usdt or stripe instead of inputting my credit card elsewhere.


Great plugin

Freemius

Md Nishath Khandakar

<p><strong>Nish Image Optimizer</strong> is a fast and simple WordPress plugin designed to make your website lighter and faster.<br />
It automatically compresses and converts your images into modern formats like <strong>WebP</strong> and <strong>AVIF</strong>, while also supporting <strong>JPEG</strong> and <strong>PNG</strong>.</p>
<p>By optimizing images directly inside WordPress, you can dramatically improve <strong>page speed</strong>, <strong>Core Web Vitals</strong>, and <strong>SEO rankings</strong> — without relying on third-party APIs or external services. Nish Image Optimizer runs 100% locally on your server using WordPress’ built-in image libraries (GD/Imagick).</p>
<h3>🚀 Key Features</h3>
<ul>
<li>✅ <strong>Automatic Optimization on Upload</strong> – new images are optimized instantly.  </li>
<li>✅ <strong>Bulk Optimization</strong> – optimize your entire Media Library with a single click.  </li>
<li>✅ <strong>Multiple Formats</strong> – WebP, AVIF, JPEG, PNG.  </li>
<li>✅ <strong>Skip Already Optimized Images</strong> – saves time and resources.  </li>
<li>✅ <strong>Minimum File Size Skip</strong> – ignore small icons or logos.  </li>
<li>✅ <strong>Fallback Detection</strong> – if AVIF/WebP isn’t supported, it falls back to JPEG/PNG automatically.  </li>
<li>✅ <strong>WP-CLI Support</strong> – for developers who want command-line optimization.  </li>
<li>✅ <strong>Lightweight & Fast</strong> – no external API calls, no credits, no monthly limits.  </li>
<li>🔑 <strong>Pro Features</strong> – per-image re-optimization, advanced PNG <span aria-hidden="true" class="wp-exclude-emoji">→</span> WebP/AVIF handling, and more.</li>
</ul>
<h3>🔑 Why Choose Nish Image Optimizer?</h3>
<ul>
<li>100% <strong>free to start</strong> with essential optimization features.  </li>
<li><strong>Pro upgrade</strong> unlocks advanced image handling for power users.  </li>
<li>Built for speed, simplicity, and <strong>WordPress performance best practices</strong>.  </li>
</ul>


Nish Image Optimizer

Lightweight WordPress image optimizer. Compress JPEG, PNG, WebP, and AVIF automatically for faster websites.

Plus WebP or AVIF vs Nish Image Optimizer