DEV Community: I Love Image Tool The latest articles on DEV Community by I Love Image Tool (@iloveimagetool). https://dev.to/iloveimagetool https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4057361%2F8f897c02-ddc4-4144-b4db-b2cd1594cb4d.png DEV Community: I Love Image Tool https://dev.to/iloveimagetool en How AVIF Reduced My Website Image Sizes by Up to 70% (And Improved Core Web Vitals) I Love Image Tool Sat, 01 Aug 2026 02:35:19 +0000 https://dev.to/iloveimagetool/how-avif-reduced-my-website-image-sizes-by-up-to-70-and-improved-core-web-vitals-1d7h https://dev.to/iloveimagetool/how-avif-reduced-my-website-image-sizes-by-up-to-70-and-improved-core-web-vitals-1d7h <h1> How AVIF Reduced My Website Image Sizes by Up to 70% (And Improved Core Web Vitals) </h1> <p>Modern websites rely heavily on images, but images are also one of the biggest reasons pages load slowly.</p> <p>While optimizing one of my projects, I decided to replace traditional JPG and PNG files with AVIF. The results were surprisingly good.</p> <ul> <li>Smaller image sizes</li> <li>Faster page loading</li> <li>Better Core Web Vitals</li> <li>Lower bandwidth usage</li> <li>No noticeable quality loss</li> </ul> <p>Here's what I learned.</p> <h2> What is AVIF? </h2> <p>AVIF (AV1 Image File Format) is a modern image format based on the AV1 video codec.</p> <p>Compared with traditional formats like JPG and PNG, AVIF delivers significantly better compression while preserving excellent visual quality.</p> <p>For many websites, switching to AVIF can reduce image sizes by <strong>40–70%</strong> depending on the content.</p> <h2> Why I Tested AVIF </h2> <p>My website contains hundreds of images.</p> <p>Even after compressing JPG files, page speed could still be improved.</p> <p>I wanted a format that could:</p> <ul> <li>Reduce download size</li> <li>Improve Google Core Web Vitals</li> <li>Preserve image quality</li> <li>Support transparency</li> <li>Work in modern browsers</li> </ul> <p>AVIF checked every box.</p> <h2> Results After Converting Images </h2> <p>Here are the improvements I observed.</p> <div class="table-wrapper-paragraph"><table> <thead> <tr> <th>Metric</th> <th>Before</th> <th>After</th> </tr> </thead> <tbody> <tr> <td>Average Image Size</td> <td>Higher</td> <td>Much Smaller</td> </tr> <tr> <td>Page Speed</td> <td>Improved</td> <td>✅</td> </tr> <tr> <td>Bandwidth Usage</td> <td>Reduced</td> <td>✅</td> </tr> <tr> <td>Visual Quality</td> <td>Nearly identical</td> <td>✅</td> </tr> </tbody> </table></div> <p>Although results vary depending on the image, AVIF consistently delivered better compression than JPG and PNG.</p> <h2> Browser Support </h2> <p>Modern browsers already support AVIF, including:</p> <ul> <li>Google Chrome</li> <li>Microsoft Edge</li> <li>Firefox</li> <li>Opera</li> <li>Safari (latest versions)</li> </ul> <p>This makes AVIF a practical choice for modern websites.</p> <h2> Bulk Conversion Matters </h2> <p>Converting one image is easy.</p> <p>Converting hundreds manually isn't.</p> <p>To simplify this workflow, I built a browser-based tool that converts multiple images to AVIF in one go.</p> <p>The conversion runs directly in your browser, making it fast and easy for batch optimization.</p> <p>🔗 <a href="https://iloveimagetool.com/bulk-images-to-avif-converter" rel="noopener noreferrer">https://iloveimagetool.com/bulk-images-to-avif-converter</a></p> <h2> Learn More </h2> <p>If you'd like a complete guide explaining AVIF, browser compatibility, compression techniques, SEO benefits and best practices, I also wrote a detailed article here:</p> <p>📖 <a href="https://iloveimagetool.com/blog-single?slug=what-is-avif-complete-guide-to-the-modern-image-format" rel="noopener noreferrer">https://iloveimagetool.com/blog-single?slug=what-is-avif-complete-guide-to-the-modern-image-format</a></p> <h2> Final Thoughts </h2> <p>AVIF isn't a replacement for every image format, but for websites focused on performance, it's becoming one of the best options available.</p> <p>If you're working on web performance, SEO, or Core Web Vitals, AVIF is definitely worth testing.</p> <p>I'm curious:</p> <p><strong>Have you started using AVIF in production?</strong><br> <a href="https://iloveimagetool.com/blog-single?slug=what-is-avif-complete-guide-to-the-modern-image-format" rel="noopener noreferrer">https://iloveimagetool.com/blog-single?slug=what-is-avif-complete-guide-to-the-modern-image-format</a> </p> webdev performance ai seo