David Degner

<p>AVIF Local Support adds modern AVIF image support to WordPress while keeping compatibility with existing JPEG media.  Built by a <a href="https://www.daviddegner.com" rel="nofollow ugc">Boston photographer</a> who needs it for their own portfolio website.</p>
<p><strong>GitHub Repository:</strong> <a href="https://github.com/ddegner/avif-local-support" rel="nofollow ugc">https://github.com/ddegner/avif-local-support</a></p>
<ul>
<li>Local-first: all processing happens on your own server — no external calls.  Works well for me on a shared CPU with 2GB of RAM on Linode.</li>
<li>Image quality first: uses Imagick PHP and CLI when available for high-quality resizing (LANCZOS), corrects EXIF orientation, and preserves ICC color profiles and EXIF/XMP/IPTC metadata when possible.</li>
<li>Tunable quality and speed: set AVIF quality (0–100) and encoder speed (0–10) to balance fidelity and performance.  You can even adjust choose chroma subsampling (4:2:0, 4:2:2, 4:4:4) and bit depth (8/10/12-bit). Defaults: 4:2:0 and 8-bit if your server supports it and you want higher quality images.</li>
<li>Wraps existing <code><img></code> tags in <code><picture></code> with an AVIF <code><source></code> when an <code>.avif</code> version is present.</li>
<li>Converts JPEG originals and generated sizes to AVIF on upload, or via a daily/background scan.</li>
<li>Preserves EXIF/XMP/IPTC metadata and ICC color profiles by default (when using ImageMagick/Imagick).</li>
<li>WordPress-aware resizing logic enabled by default to avoid double-resizing when generating AVIF sizes from originals.
<ul>
<li>Tools include: convert missing AVIFs, upload a test JPEG, and delete all AVIF files in uploads.</li>
</ul>
</li>
</ul>
<h4>How it works</h4>
<ul>
<li>Front end: Filters common image outputs to add an AVIF <code><source></code> ahead of the original JPEG. Browsers that support AVIF will use it; others fall back to JPEG.</li>
<li>Conversion: Uses Imagick when available (preferred) — with auto-orientation and LANCZOS resizing — or GD with an AVIF encoder. Quality, speed, chroma subsampling, and bit depth are configurable (subsampling/bit depth applied via Imagick when supported).</li>
<li>Scheduling: Optional daily scan to backfill missing <code>.avif</code> files for existing JPEGs.</li>
</ul>
<h4>Requirements</h4>
<ul>
<li>PHP 8.0 or later (8.1+ recommended)</li>
<li>WordPress 6.5 or later</li>
<li>Imagick PHP extension recommended for best quality and metadata/ICC preservation. GD fallback supported.</li>
</ul>
<h3>Ubuntu/Debian setup (summary)</h3>
<p>For local JPEG<span aria-hidden="true" class="wp-exclude-emoji">→</span>AVIF conversion you need either Imagick with AVIF-enabled ImageMagick, or GD with AVIF support:</p>
<ul>
<li>
<p>Imagick path (recommended)</p>
<ul>
<li>PHP extension: imagick</li>
<li>System libraries: ImageMagick built with HEIF/AVIF support (via libheif)</li>
<li>Notes: This path enables higher-quality resizing and preserves metadata/ICC profiles</li>
</ul>
</li>
<li>
<p>GD path (fallback)</p>
<ul>
<li>PHP extension: gd built with AVIF support (provides <code>imageavif</code> on PHP 8.1+)</li>
<li>Notes: Ensure your distro’s PHP GD is compiled with AVIF; some builds omit it</li>
</ul>
</li>
<li>
<p>Helpful extras</p>
<ul>
<li>PHP exif extension (for orientation handling in the GD fallback)</li>
<li>Web server configured to serve <code>.avif</code> as <code>image/avif</code> (Apache/Nginx/LiteSpeed)</li>
</ul>
</li>
</ul>
<p>Official documentation:<br />
– PHP Imagick installation: https://www.php.net/imagick<br />
– PHP GD installation (AVIF details): https://www.php.net/manual/en/image.installation.php<br />
– ImageMagick format support (AVIF/HEIF): https://imagemagick.org/script/formats.php<br />
– Apache MIME configuration: https://httpd.apache.org/docs/current/mod/mod_mime.html<br />
– Nginx MIME configuration: https://nginx.org/en/docs/http/ngx_http_types_module.html</p>


AVIF Local Support

AVIF support for converting and serving high quality photos. Built by a photographer, not trying to sell subscriptions.

Nitin Singh

<p><strong>Image Ninja – Convert Images to WebP & AVIF on Upload</strong> is a lightweight WordPress plugin that automatically converts JPEG and PNG images to modern WebP and AVIF formats upon upload. The plugin improves website performance by optimizing image file sizes without compromising quality, leading to faster page loading times.</p>
<h3>Key Features</h3>
<ul>
<li>Automatically converts JPEG and PNG images to WebP and AVIF formats during upload.</li>
<li>Allows configuration of WebP and AVIF image quality in the settings.</li>
<li>Enhances website performance by reducing image file sizes.</li>
<li>Simple settings interface under <code>Settings > Media</code> for easy customization.</li>
<li>Lightweight and developer-friendly codebase.</li>
</ul>
<p>This plugin is ideal for website owners looking to improve load times and optimize image delivery, especially on mobile devices and slow connections.</p>
<h3>Why WebP?</h3>
<p>WebP is a modern image format developed by Google that provides both lossy and lossless compression for images on the web. Here are some benefits of using WebP:</p>
<ul>
<li><strong>Smaller File Size</strong>: WebP images can be up to 30% smaller than JPEGs and PNGs with no noticeable loss in quality, resulting in faster page load times.</li>
<li><strong>Transparency and Animation</strong>: WebP supports transparent backgrounds like PNG and animated images like GIF, making it a versatile choice.</li>
<li><strong>Improved Compression</strong>: WebP offers better compression algorithms compared to traditional formats, allowing for high-quality images with lower storage requirements.</li>
</ul>
<h3>Why AVIF?</h3>
<p>AVIF (AV1 Image File Format) is a cutting-edge image format derived from the AV1 video codec, offering even better compression than WebP. Here’s why AVIF is beneficial:</p>
<ul>
<li><strong>High Compression Efficiency</strong>: AVIF can reduce image sizes by up to 50% compared to JPEG, while maintaining similar or even higher visual quality.</li>
<li><strong>HDR Support</strong>: AVIF supports High Dynamic Range (HDR), allowing for more vibrant and detailed images, especially on modern displays.</li>
<li><strong>Advanced Features</strong>: It includes support for transparency, animation, and a wider color gamut, making it suitable for various types of web content.</li>
</ul>
<h3>License</h3>
<p>This plugin is licensed under the GPLv2 or later license.</p>


Image Ninja – Convert Images to WebP & AVIF on Upload

Automatically convert JPEG and PNG images to WebP and AVIF formats during upload to optimize your WordPress site’s performance.

AVIF Local Support vs Image Ninja – Convert Images to WebP & AVIF on Upload