Both are dramatic improvements over JPG and PNG. But which to pick for your use case? Here's the real-world comparison with concrete numbers.
If you're optimizing images for the web in 2026, you have two excellent modern format options: WebP and AVIF. Both produce dramatically smaller files than JPG or PNG. Both support transparency. Both are widely supported by browsers.
So which do you pick? The honest answer is "it depends," but there are clear rules of thumb. This article gives you those rules with the data behind them.
<picture> for fallbacks.Both formats are dramatically better than JPG. The difference between them is more subtle.
For typical web photos at equivalent visual quality:
AVIF wins, but the gap with WebP is smaller than the gap from JPG to WebP. The first 25% comes easy; the next 15-20% requires AVIF's more sophisticated compression.
This is where WebP wins decisively. AVIF encoding is computationally expensive — often 10-50× slower than WebP for the same content. For static images this doesn't matter much (encode once, serve forever), but for any pipeline that processes images on-the-fly, the difference is significant.
Real numbers on a modern laptop:
The picture is different on decode. AVIF actually decodes slightly faster than WebP in many browsers (because it leverages hardware-accelerated H.265-style decoders). JPG remains the fastest to decode.
Both are well over the threshold where you can use them as primary formats. WebP has slightly better coverage but the gap is small.
This is where AVIF significantly wins. At aggressive compression settings (small files), AVIF produces dramatically better-looking results than WebP.
WebP at quality 50 starts showing visible blocking and color banding. AVIF at the equivalent file size remains clean — slightly softer, but no obvious artifacts.
This matters most for thumbnails, preview images, and any case where you're aggressively compressing.
Both support: alpha-channel transparency, animation, lossy and lossless modes.
AVIF additionally supports: 10-bit and 12-bit color depth, HDR, wider color gamuts, depth maps, multi-image sequences.
For typical web use, the basic features are all you need, so the extra AVIF features don't change the decision.
Use the <picture> element to serve all three formats:
<picture>
<source srcset="image.avif" type="image/avif">
<source srcset="image.webp" type="image/webp">
<img src="image.jpg" alt="..." width="1200" height="800">
</picture>Modern browsers use AVIF. Slightly older use WebP. The rest fall back to JPG. Everyone gets the best they can render.
If you're processing user-uploaded images on the fly (e-commerce, social media, CMS), use WebP. AVIF's slow encoding makes it impractical for real-time processing on a busy site.
Start with WebP. It's easier to adopt (most CDN providers convert automatically), the tooling is more mature, and you get 95% of the savings. Add AVIF later as a layer on top.
Email clients, some legacy CMSs, internal tools — use JPG. WebP and AVIF support varies. Don't use modern formats where they'll be rejected.
WebP tooling is mature. Photoshop, Lightroom, ImageMagick, every CDN, every CMS — all handle WebP without issue. WebP encoders have been optimized for over a decade.
AVIF tooling is catching up but still rough. Photoshop only added AVIF export in 2022. Many CDNs added AVIF support more recently. Encoders have wide quality variations depending on which one you use.
This will improve over time, but it's worth knowing now.
Both formats are now stable and widely deployed. AVIF will continue gaining share as Safari's adoption grows. WebP usage will stay strong because it's good enough and ubiquitous. Neither format is going anywhere.
JPEG XL is on the horizon — Apple has signaled support, others are evaluating. But it's not yet ready for production use. WebP and AVIF are the safe modern bets through 2027 at minimum.
WebP is the safe choice. AVIF is the optimization. For production sites that care about every kilobyte, serve both via <picture>. For simpler setups, just use WebP and call it done — you'll capture most of the available savings with minimal complexity.
Convert to WebP or AVIF with our free format converter. Browser-based, no upload, supports both formats.