AVIF vs WebP: The Next-Gen Image Format Showdown

For most photos on the web in 2026, AVIF gives you smaller files at the same quality, while WebP wins on encoding speed and near-universal support. If you want one format to ship today with zero fallback headaches, WebP is the safe default. If you care about the last 20 to 30 percent of file size and can serve a fallback, AVIF is the better bet.

Both beat JPEG and PNG. The real question is which one fits your stack, your traffic, and how much you care about squeezing every kilobyte.

What is an AVIF file?

An AVIF file is an image saved in the AV1 Image File Format. It reuses the compression from the AV1 video codec (the one built by the Alliance for Open Media) and wraps a single still frame in an ISO container. The extension is .avif.

Because it borrows from a modern video codec, AVIF supports things older formats never handled well: 10 and 12-bit color depth, HDR, wide color gamut, transparency (an alpha channel), and animation. It is royalty-free, so there are no licensing fees to encode or decode it.

In plain terms: AVIF is a newer, more efficient way to store a photo or graphic. It usually produces a smaller file than JPEG, PNG, or WebP at a quality your eye can’t tell apart.

AVIF vs WebP: how the compression differs

WebP came out of Google in 2010, built on the VP8 video codec. It has two modes: lossy (like JPEG) and lossless (like PNG). It was the first “next-gen” web format to get broad traction.

AVIF arrived later and is built on AV1, a generation ahead of VP8. AV1 uses smarter block partitioning, better intra-frame prediction, and more advanced entropy coding. The short version: AVIF’s encoder has more tools to describe the same image with fewer bits.

That difference shows up most on two kinds of content. AVIF handles smooth gradients and flat color areas without the blocky banding WebP sometimes leaves behind. It also holds detail better at aggressive compression settings, so the file can go smaller before artifacts become visible.

WebP is not obsolete. For simple graphics, icons, and screenshots at moderate compression, the two formats often land within a few kilobytes of each other, and WebP encodes far faster.

File size and quality benchmarks: AVIF vs WebP file size

Here is the pattern you’ll see across most real-world tests, including our own runs through the image-compressor tool.

Start with a typical 1600px JPEG photo at around 500 KB. Re-encode it at a visually matched quality:

• WebP lands somewhere around 200 to 280 KB, roughly 45 to 60 percent smaller than the JPEG.
• AVIF lands around 130 to 200 KB, often 25 to 30 percent smaller than the equivalent WebP.

The gap widens on photographic content with lots of gradients (skies, skin tones, out-of-focus backgrounds) and narrows on flat UI graphics. On a solid-color logo with transparency, WebP lossless and AVIF can come out nearly identical.

Two honest caveats. First, “same quality” is subjective, and the numbers move a lot depending on encoder settings. A lazy AVIF export can lose to a well-tuned WebP. Second, at very high quality (near-lossless), AVIF’s advantage shrinks, and WebP or even JPEG can occasionally win on file size. AVIF shines most in the medium-to-aggressive compression range where the web actually lives.

If you want to see the real numbers for your own images instead of trusting a generic benchmark, that is exactly what a lossy vs lossless compression test will show you.

AVIF browser support and OS support in 2026

As of 2026, AVIF browser support is broad but not quite total. Chrome, Edge, Firefox, Safari, and Opera all decode AVIF on current versions. Safari added support in version 16 (2022), which was the last big holdout to close.

The gaps are at the edges: older Safari on iOS devices that can’t update, some Linux image viewers, and a long tail of older Android WebViews. Email clients are the worst case. Many still don’t render AVIF or even WebP reliably, so email images stay on JPEG or PNG.

WebP support is effectively universal in browsers now, going back several years across every major engine. If you serve a WebP with no fallback, almost nobody sees a broken image.

OS-level support (thumbnails in a file manager, native preview) trails browser support for both formats but has caught up on recent Windows, macOS, and Android releases. Older systems may show a generic icon instead of a preview.

The practical takeaway: AVIF needs a fallback plan, WebP mostly doesn’t. That single fact drives most real decisions below.

Encoding speed and practical trade-offs

AVIF’s compression comes at a cost: it is slow to encode. Depending on the encoder and effort setting, an AVIF can take several times longer to produce than a WebP of the same image. On a build pipeline generating thousands of images, that adds up to real minutes and real CPU.

Decoding is fast enough for both on modern hardware, so the speed penalty is mostly a build-time and encode-time concern, not a “does it load fast for users” concern.

A few practical trade-offs to weigh:

• Build time. If you regenerate an entire image library on every deploy, AVIF’s slower encode can hurt. Cache aggressively.
• Tooling maturity. WebP tooling is everywhere and battle-tested. AVIF tooling is good now but you’ll occasionally hit an encoder quirk or an old library that produces bloated files.
• Animation. Both support animation, but for anything beyond a short loop, a real video (MP4 or WebM) beats an animated image every time on size.

Should you use AVIF, WebP, or both (with fallbacks)?

For most sites, the strongest answer is both, served with an automatic fallback. Modern frameworks and image CDNs make this a one-line config, so you rarely hand-write it.

The mechanism is the HTML <picture> element with multiple <source> tags. The browser picks the first format it can decode:

<picture>
  <source srcset="photo.avif" type="image/avif" />
  <source srcset="photo.webp" type="image/webp" />
  <img src="photo.jpg" alt="A real, descriptive alt text" width="1600" height="900" />
</picture>

The browser tries AVIF first, falls back to WebP, then to JPEG for anything ancient. You get AVIF’s file-size win where it’s supported and a safe landing everywhere else.

If you can only pick one and you can’t do fallbacks, ship WebP. The support is universal, the encoding is fast, and the size win over JPEG is still large. Choosing the best image format for web is less about the theoretical winner and more about what your pipeline can actually deliver without breaking on old devices.

If you’re mainly comparing against your current JPEG library, the jump from JPEG to either next-gen format is the big one. See webp vs jpeg for that specific upgrade path.

AVIF vs WebP summary table

Factor	AVIF	WebP
Base codec	AV1 (2018)	VP8 (2010)
Typical file size	Smallest	Small
Encoding speed	Slow	Fast
Browser support 2026	Broad, needs fallback	Universal
Transparency (alpha)	Yes	Yes
HDR / wide gamut / 10-bit	Yes	No
Animation	Yes	Yes
Best for	Photos, gradients, max savings	General use, fast builds, safe default

Compress your images before choosing a format

The format only matters after you’ve stopped shipping oversized source images. A 4000px photo squeezed into a 600px slot wastes bandwidth in any format, AVIF included.

Resize to the dimensions you actually display, then convert. You can do both in the browser, with nothing uploaded to a server, using our image-compressor. Drop in a JPEG or PNG, compare the AVIF and WebP output side by side, and read the real byte counts for your own images instead of a benchmark someone else ran.

FAQ

Is AVIF better than WebP?

For file size at matched quality, usually yes, especially on photos with gradients, where AVIF often runs 25 to 30 percent smaller than WebP. WebP wins on encoding speed and universal support. “Better” depends on whether you value smaller files or a simpler, fallback-free setup.

What is an AVIF file used for?

Storing photos and graphics on the web at a smaller size than JPEG, PNG, or WebP. It’s also used where HDR, wide color gamut, or 10-bit depth matter, since WebP can’t handle those. You’ll see .avif most often on image-heavy sites and modern CDNs.

Does AVIF have full browser support in 2026?

Nearly. Chrome, Edge, Firefox, Safari (since version 16), and Opera all decode AVIF. The gaps are old un-updatable devices, some email clients, and older Android WebViews. That’s why serving AVIF with a WebP or JPEG fallback is the standard approach.

Should I convert all my WebP images to AVIF?

Not blindly. Re-test a sample first. For photographic content you’ll usually save meaningful bytes, but for flat UI graphics and icons the two formats are often within a few kilobytes, so the slower AVIF encode may not be worth it. Convert where the savings are real.