Short answer: AVIF usually produces smaller files than WebP at the same quality, but WebP encodes faster and has slightly wider, longer-proven support. For maximum compatibility choose WebP; for the smallest files on modern browsers, choose AVIF. This guide compares WebP vs AVIF so you can pick without guessing.
What is WebP?
WebP is a modern image format Google introduced in 2010, now supported in every major browser. It typically cuts file size by 25–35% versus JPEG at the same visual quality, and it handles both lossy and lossless compression plus transparency and animation. Because it’s been around for years, tooling and hosting support are excellent and well tested.
What is AVIF?
AVIF (AV1 Image File Format) is a newer format from around 2019, built on the AV1 video codec. It pushes compression further than WebP, often landing 20–30% smaller at visually identical quality. It also supports lossy and lossless modes, transparency, and animation — but it’s heavier to encode and decode, so conversion is slower and older devices work harder.
Compression and quality: AVIF vs WebP
On pure efficiency, AVIF wins. At quality settings that look the same to the eye, AVIF files are frequently 15–30% smaller than WebP, especially for photographs. AVIF is particularly strong at very aggressive compression, holding detail where other formats fall apart.
WebP’s edge is speed and predictability. It encodes quickly and behaves consistently across a wide range of quality settings, which matters for bulk jobs and for images generated on the fly. At normal compression levels both formats look great; the gap is widest only when you push quality very low.
Browser support in 2026
WebP has effectively universal support — Chrome, Edge, Firefox, Safari, and Opera all handle it natively, and only very old browsers miss it. AVIF is now supported in current Chrome, Edge, Firefox, and Safari too, though it arrived later and lags slightly in older Safari builds. In short: WebP is the safest bet for the broadest reach, while AVIF is reliable on modern browsers and best paired with a fallback.
Encoding speed and tooling
WebP encodes fast, often in near real time, and it’s built into most editors and command-line tools like ImageMagick and FFmpeg. AVIF encoding is noticeably slower — sometimes several times slower on ordinary hardware — and its tooling is less mature. For large batches, plan for the extra time or use faster hardware.
Which should you use?
- Use WebP when you want universal compatibility, fast encoding, or you’re converting user uploads on the fly. It’s the safe, proven default.
- Use AVIF when your audience is mostly on modern browsers and squeezing out every kilobyte matters — hero images, marketing pages, image-heavy galleries.
- Use both by serving AVIF with a WebP (or JPEG) fallback via the HTML
<picture>element, so each visitor gets the best format their browser supports.
For most sites, starting with WebP and adding AVIF later is a sensible path. For how WebP stacks up against the older formats, see our JPG vs PNG vs WebP comparison.
How to convert your images
Command-line tools (ImageMagick, FFmpeg) work well if you’re comfortable with scripts, but for quick jobs a web converter is easier. Our free JPG to WebP converter handles batches with drag-and-drop, no account and no limits, so you can convert and download in seconds. For a deeper look at the format itself, read our complete WebP guide.
Frequently Asked Questions
Is AVIF worth the extra encoding time?
For static content like blog images and galleries, usually yes — the smaller files speed up loading, especially on slower connections. For images generated on the fly, WebP’s faster encoding often wins. Many sites use a hybrid: AVIF for fixed marketing assets, WebP for user uploads.
Can I use WebP or AVIF without breaking older browsers?
Yes. Use the HTML <picture> element to offer AVIF or WebP with a JPG or PNG fallback, and older browsers automatically use the fallback. Alternatively, WebP alone is safe for the vast majority of modern traffic.
Which is smaller in WebP vs AVIF?
AVIF is typically 20–30% smaller than WebP at the same quality, which makes it appealing when bandwidth is tight. That said, WebP is already much smaller than JPEG, so either is a big upgrade over legacy formats.