AVIF vs WebP: The Next-Gen Image Formats, Head-to-Head

Both AVIF and WebP promise smaller images than JPG and PNG, and both ship in every evergreen browser in 2026. So if you’re modernizing a site’s images, the real decision isn’t “next-gen or not” — it’s AVIF or WebP. They take different routes: AVIF borrows the AV1 video codec for state-of-the-art compression, while WebP — older, faster, and rock-solid — leans on VP8. This guide puts the two head-to-head on the things that actually move the needle: file size, quality, encode speed, browser support, and feature support, then tells you which to reach for.

Quick answer: AVIF usually wins on file size — at low-to-mid quality it’s often roughly half the size of WebP for the same photo, and it adds HDR, 10/12-bit color, and wide-gamut support WebP doesn’t have. WebP wins on encode speed and the last sliver of browser reach (≈96% vs ≈93% global). Practical 2026 setup: serve AVIF with a WebP fallback, or pick WebP alone when encode time, simplicity, or maximum compatibility matters more than the last few kilobytes.

Jump to a section

• Lineage: where each format came from
• Compression efficiency: which one is smaller
• Quality and artifacts
• Feature support: HDR, bit depth, alpha, animation
• Browser support in 2026
• Encode speed: AVIF’s main cost
• Decision table: which to pick
• Convert and compress with xconvert
• FAQ

Lineage: where each format came from

The two formats descend from two different video codecs, and that ancestry explains almost every difference between them.

WebP is Google’s, derived from the VP8 video codec. Google introduced it in 2010 as a single format that could do lossy and lossless compression, transparency, and animation — replacing the awkward JPG/PNG/GIF split with one container. It’s been stable and broadly shipped for over a decade.

AVIF (AV1 Image File Format) is younger and comes from the AV1 video codec built by the Alliance for Open Media (AOMedia) — a consortium founded in 2015 by Amazon, Cisco, Google, Intel, Microsoft, Mozilla, and Netflix to create a royalty-free alternative to patent-encumbered codecs like HEVC. AV1’s bitstream spec was finalized in 2018, and AVIF wraps AV1-encoded still frames in a HEIF container. Because AV1 is a newer, more sophisticated codec than VP8, AVIF inherits stronger compression and richer color features — at the cost of much heavier encoding.

If you’re weighing these against the old formats (JPG and PNG) rather than against each other, see the companion guide PNG vs WebP vs JPG — that one covers the “should I even leave JPG/PNG?” decision. This article assumes you’ve already decided to go next-gen and just need to pick which.

Compression efficiency: which one is smaller

In most real-world tests, AVIF produces smaller files than WebP at the same perceived quality, and the gap is widest at low-to-medium quality settings — exactly the range you’d use for web delivery.

Web platform engineer Jake Archibald’s AVIF analysis put numbers to it on real images:

These are illustrative single-image results, not a universal law — the exact savings depend heavily on image content, the encoder, and the quality target. Two honest caveats:

• AVIF’s lead shrinks at high quality. Near-lossless settings narrow the gap, and for some images (especially ones with fine high-frequency texture) WebP can match or occasionally beat AVIF.
• The numbers above are per-image, not an average. Treat “AVIF is roughly half the size” as a reasonable expectation for typical web photos at web quality, not a guarantee for every file.

For a rough sense of the ladder against the legacy formats: WebP lossy runs about 25–34% smaller than JPEG at equivalent quality (Google’s own figure), and AVIF generally lands meaningfully smaller again than WebP. So the stack, smallest-first, is usually AVIF → WebP → JPEG.

Quality and artifacts

Both formats are lossy by default (each also has a lossless mode). The way they fail under heavy compression differs:

• WebP at aggressive settings can show blockiness and slight blurring, and it sometimes softens fine detail. It’s well-understood and predictable.
• AVIF tends to preserve detail and smooth gradients better at the same file size, thanks to AV1’s more advanced prediction and transform tools. Its characteristic failure mode at extreme compression is a slightly “smudged” or over-smoothed look rather than hard blocks — it trades sharpness for the absence of obvious artifacts.

For flat-color UI graphics, logos, and text, both have lossless modes that beat PNG, but PNG-style lossless screenshots are a use case where the AVIF-vs-WebP gap is small and other factors (encode time, support) usually decide it. For continuous-tone photos, AVIF’s quality-per-byte advantage is most visible.

Feature support: HDR, bit depth, alpha, animation

This is where AVIF clearly pulls ahead — it inherited AV1’s modern color pipeline.

Sources: MDN image type guide and Google’s WebP docs.

The practical reading:

• For ordinary 8-bit web images (most photos, most UI), WebP and AVIF offer the same feature checklist — alpha, animation, lossy/lossless. The decision there comes down to file size and encode cost, not features.
• For HDR, 10/12-bit color, or wide-gamut (P3) imagery — modern phone photos, design work targeting wide-gamut displays — AVIF is the only one of the two that can carry it. WebP tops out at 8-bit and effectively sRGB, so it can’t represent that extra color information at all.
• For animation, both beat GIF substantially, and both are viable; AVIF’s frames compress better, but tooling and decode cost favor animated WebP for simple cases.

Browser support in 2026

Both formats are now safe to use on the modern web — the era when AVIF support was spotty is over. Per caniuse:

Two things to note. First, WebP has a longer track record and slightly broader reach — it landed in browsers years earlier, so older devices that never got AVIF often still handle WebP. Second, AVIF’s broad support is recent: Chrome shipped it in 2020, but Safari only reached full support in 16.4, and Chromium-based Edge didn’t enable it by default until version 121. If your analytics still show a meaningful tail of older Safari or Edge, that’s the gap a WebP fallback fills.

The standard pattern handles both at once — the browser picks the first format it understands:

Encode speed: AVIF’s main cost

The flip side of AVIF’s compression is that it is dramatically slower to encode than WebP. AV1 is a heavy codec, and squeezing out AVIF’s best file sizes means spending real CPU time.

Jake Archibald’s write-up captures the range: at a low “effort” setting an AVIF takes a few seconds, a middle setting “a couple of minutes,” and the maximum-quality effort he used “can take over 10 minutes to encode a single image.” WebP, by contrast, encodes in a fraction of a second for typical images. Decode (the browser displaying the image) is also somewhat heavier for AVIF, though far less of a concern than encode.

What this means in practice:

• For a static asset pipeline — images you encode once at build time and serve millions of times — AVIF’s encode cost is paid once and amortized away. Spend the CPU; ship the smaller file.
• For on-the-fly or high-volume conversion — user uploads, dynamic resizing, batch jobs under time pressure — WebP’s speed is a genuine advantage, and the file-size difference may not justify the extra processing time.

xconvert runs the encode on its servers rather than your machine, so a slow AVIF encode doesn’t tie up your browser — you upload, the conversion happens server-side, and you download the result.

Decision table: which to pick

The short version: default to AVIF when you can afford the encode and want the smallest files (especially with HDR/wide-gamut content), and reach for WebP when speed, simplicity, or the widest compatibility wins. Serving both via <picture> gives you AVIF’s size with WebP’s reach.

Convert and compress with xconvert

xconvert handles both formats server-side — files upload over an encrypted connection, get processed on our servers, and are deleted automatically after a few hours.

• Compress WebP — shrink static or animated WebP with quality and target-size controls.
• Compress AVIF — reduce AVIF file size with quality presets or an exact target size.
• WebP to AVIF — re-encode existing WebP assets to AVIF to squeeze out the extra savings.

For the broader “should I move off JPG/PNG at all?” decision and where each legacy format still wins, see PNG vs WebP vs JPG.

FAQ

Is AVIF actually better than WebP?

For file size and color features, generally yes — AVIF produces smaller files at the same perceived quality (often roughly half the size of WebP for typical web photos at web quality) and uniquely supports HDR, 10/12-bit depth, and wide color gamut. WebP’s advantages are speed (much faster to encode), maturity, and slightly broader browser reach. “Better” depends on whether you’re optimizing for bytes (AVIF) or for encode speed and compatibility (WebP).

Which compresses smaller, AVIF or WebP?

AVIF, in most cases, especially at the low-to-medium quality settings used for web delivery — single-image tests commonly show AVIF at roughly 50% the size of an equivalent WebP. The gap narrows at near-lossless quality, and for some high-detail textures WebP can occasionally match it, so the savings are content-dependent rather than fixed.

Why is AVIF so slow to encode?

Because AVIF is built on the AV1 video codec, which uses computationally expensive prediction and transform tools to achieve its compression. High-quality AVIF encoding can take seconds to minutes per image, versus a fraction of a second for WebP. This is fine for build-time asset pipelines (encode once, serve forever) but a real cost for on-the-fly conversion. Running the encode server-side, as xconvert does, keeps it off your own machine.

Do AVIF and WebP support transparency and animation?

Yes — both support an alpha channel for transparency and both support animation, and both beat their legacy equivalents (PNG alpha, GIF animation) on file size. The feature difference is in color: AVIF adds HDR, 10/12-bit depth, and wide gamut; WebP is limited to 8-bit.

Is WebP obsolete now that AVIF exists?

No. WebP is still widely used and is the right pick when encode speed matters, when you want one format without a fallback chain, or when you need the broadest compatibility. The common production pattern is to serve AVIF and WebP together via <picture>, so WebP remains the dependable fallback for browsers or devices that don’t support AVIF.

Can every browser display AVIF in 2026?

Almost — AVIF support sits around 93% globally per caniuse, covering current Chrome (85+), Firefox (93+), Safari (16.4+), and Edge (121+). The tail is older Safari and Edge versions. WebP’s ~96% reach is slightly broader because it shipped years earlier. A WebP (or JPG) fallback covers the remainder.

Should I convert my existing WebP images to AVIF?

It can be worth it for bandwidth-heavy sites — re-encoding WebP to AVIF often trims file size further with no visible quality difference. Keep the WebP versions as a fallback rather than deleting them. You can batch-convert with WebP to AVIF.

Sources

Last verified 2026-06-17.

• Can I Use — AVIF browser support and WebP browser support — current global support percentages and per-browser versions.
• MDN — Image file type and format guide — AVIF/WebP codecs, container, color depth, HDR, alpha, animation support.
• Alliance for Open Media — AV1 codec origin and consortium (AV1 spec finalized 2018).
• Google Developers — WebP — WebP lineage (VP8), feature support, and JPEG/PNG size comparisons.
• Jake Archibald — AVIF has landed — per-image AVIF vs WebP file-size and encode-speed comparisons.