WebP vs AVIF: which should you use?
Both are modern image formats that beat JPEG and PNG. AVIF usually wins on file size for photos; WebP wins on encoding speed and universal support. Here’s how to choose — and why many sites use both.
The 30-second version
Use WebP as your safe default: it’s supported in every current browser, encodes quickly, and is 25–35% smaller than JPEG. Use AVIF when you want the smallest possible photographic files — it’s often around 50% smaller than JPEG, at the cost of slower encoding. The best-of-both approach is to serve AVIF first with a WebP fallback.
WebP vs AVIF, side by side
| Factor | WebP | AVIF |
|---|---|---|
| File size (photos) | Smaller than JPEG (~25–35%) | Smallest (~50% vs JPEG) |
| Encoding speed | Fast | Slower (more CPU) |
| Browser support | Universal (all current browsers) | Broad, slightly newer |
| Transparency | Yes | Yes |
| Animation | Yes | Yes |
| Wide color / HDR | Limited | Yes |
| Best for | Default web images | Photographic hero images |
Why serve both
A <picture> element can offer AVIF first, then WebP, then a JPEG/PNG fallback. The browser picks the first format it supports, so you get AVIF’s size on capable clients and WebP/JPEG everywhere else. Optimagio can produce each variant from a single source, so building this fallback is one optimization job rather than three manual exports.
Generate both in one pass
Convert a source image (or a whole catalog) to AVIF and WebP with Optimagio, then ship an AVIF-first <picture> with a WebP fallback.
Frequently asked questions
Is AVIF better than WebP?
For photographic content, AVIF usually produces smaller files than WebP at the same quality and supports wide color and HDR. WebP encodes faster and has marginally broader long-tail support. Many sites serve AVIF with a WebP fallback to get both benefits.
Should I use WebP or AVIF in 2026?
Use WebP as the universal default and AVIF for photographic images where the smallest size matters. The ideal setup serves AVIF first with a WebP fallback via the <picture> element.
Do both formats support transparency?
Yes. Both WebP and AVIF support an alpha channel (transparency) and animation, so they can replace PNG and GIF as well as JPEG.
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