AVIF vs WebP: Which One Makes Google Love Your Site?

Confronted by the continuous quest for speedy loading and high-quality user experiences, SEO experts and web developers never stop evaluating every single byte transferred. The most common objects that can be optimised are images, as they make the heaviest substances of a web page. JPEG and PNG have been king of the hill for years, but more efficient file types have come along, such as WebP and even more promising AVIF, so it is all set to profit even more. The critical question for anyone aiming to climb Google’s search rankings is: which of these next-gen formats, AVIF or WebP, will truly make Google love your site?

The Google Mandate: Speed and User Experience

Google has made it clear that page speed is one of the ranking factors. User experience is directly measured by its Core Web Vitals, which are Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS). Images can massively affect LCP (the time it requires for the largest content element to be visible) and can affect INP and CLS in case of improper management. Thus, the optimisation of the image delivery is not a fancy thing anymore; it is a strategic requirement of SEO. WebP and AVIF attempt to provide by providing improved compression compared with their predecessors.

WebP: The Established Contender

Introduced in 2010 by Google, WebP was rapidly becoming an outstanding alternative to JPEG and PNG. It has lossy compression variants and lossless support,transparency (similarly with PNG), and, indeed, animation (similarly with GIF). Its key advantages lie in:

• Significant File Size Reduction: WebP lossy images are typically % smaller than comparable JPEGs at similar quality, while lossless WebP images are about 26% smaller than PNGs. That is literally translated to faster page loads and minimal bandwidth use.
• Broad Browser Support: WebP currently boasts widespread compatibility across major browsers, including Chrome, Firefox, Edge, and Safari (though older iOS versions might have some limitations). This wide support makes it a safe and secure choice in ensuring that the images become visible to the majority of the users.
• Faster Encoding/Decoding: Generally, WebP images can be encoded and decoded more quickly than AVIF, which can be advantageous for sites with high image processing demands or real-time image generation.
• Versatility: With support for various compression types, transparency, and animation, WebP is a highly versatile format suitable for a wide range of web graphics, from photos to icons and UI elements.

AVIF: The Rising Star

The new kid on the block is AVIF (AV1 Image File Format), which is based on the state-of-the-art AV1 video codec, and it appeared in 2019. It will also set out to explore the full capabilities of image compression and quality only like never before. Its compelling benefits include:

• Superior Compression Efficiency: This is AVIF’s standout feature. AVIF has a demonstrated tendency to be smaller compared to the WebP equivalent VQ at the same level, with an average of 20-50 per cent and an astounding 45-60 per cent less than that of JPEGs, respectively. It implies even shorter loading times and more bandwidth increments that are especially helpful to image-dense types of websites, such as photography portfolio web pages or an online store.
• Enhanced Image Quality: AVIF supports higher colour depths (8, 10, and 12-bit) and High Dynamic Range (HDR) content, resulting in richer colours, smoother gradients, and finer detail, especially noticeable on modern displays. This is capable of creating a more invasive and aesthetic user experience.
• Advanced Features: Beyond transparency and animation, AVIF supports multi-layer images and even film grain synthesis, offering more advanced capabilities for complex visual requirements.
• Progressive Decoding: AVIF supports progressive decoding, meaning a low-resolution version of the image can be displayed quickly, with higher detail progressively loading, improving perceived performance on slower networks.
• Royalty-Free: Like WebP, AVIF is an open-source and royalty-free format, encouraging wider adoption without licensing concerns.

The Love that Counts the Most to Google

Neither of the two formats is entirely next-gen and comes with much more improvement over the older formats, but when it comes to AVIF and WebP, the decision between them is a trade-off between extremes of performance and compatibility.

• Compression & File Size: AVIF is the clear winner here, consistently delivering smaller file sizes for comparable quality. This is later connected to increased LCP scores, which is one of the Core Web Vitals and also a green flag to Google.
• Image Quality: AVIF generally offers superior image quality, especially for high-resolution photographs and HDR content, thanks to its wider colour gamut and advanced compression algorithms. AVIF has an advantage over other formats in a site where visual fidelity is the issue.
• Browser Compatibility: WebP currently has the upper hand in terms of widespread browser support (around 97% vs. AVIF’s roughly 94% as of mid-2025). Although the support of AVIF is soaring, a minor level of users, specifically those that use older browsers or operating systems, may find no avail of AVIF images unless they use a fallback.
• Decoding Speed: WebP often has faster decoding , especially on less powerful devices or older hardware. The benefit of AVIF is that its more complex compression is also slightly slower to decode in some cases, so it may be quicker to render it in some instances.

What Gets Google to Love Your Site?

Google is fond of quick, user-friendly websites. AVIF and WebP are beneficial to this objective since they decrease image file size and speed load. However, the nuanced answer depends on your priorities and audience:

• For cutting-edge performance and visual fidelity: If your website is image-rich, targets a modern audience, and prioritises the absolute fastest loading times and highest image quality, AVIF is likely to be Google’s favourite for your site. Its better compression will be more influential on LCP and total page weight.
• For broader compatibility and general web use: If ensuring your images are visible to virtually all users, including those on slightly older browsers, is a top concern, WebP remains an excellent and safe choice. The popularity of its use makes it a general format for blogs, general content sites and applications on which universal access is most important.

The Dual-Format Strategy: The Best of Both Worlds

And lastly, it does not always have to be one or the other. The best option that works on most websites is the adaptation of the two-format system with the HTMLpicture> element. That way, you can make browsers which support AVIF get it but otherwise handle the fallback to WebP (or even JPEG/PNG) gracefully.

This guarantees the most optimised AVIF images to modern browsers and the widest performance benefit without sacrificing fallback to be as compatible as possible.

Conclusion

Both AVIF and WebP are capable of making their players win in the fight to claim the heart of Google. AVIF is the future of web imagery since it has unrivalled compression and high image quality and has the biggest potential to improve Core Web Vitals. WebP has been proved to be highly compatible and has great performance, thus staying as a very reliable one. Using a combination of those to their advantage with respect to each other, preferably in both formats, you can make your website drift through the sky with a slick design and excruciating speed, as well as being highly adored by Google algorithms and, more importantly, the actual people using it.