AVIF vs WebP vs JPEG: Which Next-Gen Image Format Wins?

Every few years a "next-gen" image format arrives promising smaller files and better quality, and the web spends the next decade arguing about whether to adopt it. Right now the argument is a three-way one: the 30-year-old JPEG that still runs the internet, Google's WebP that quietly became the modern default, and AVIF, the AV1-derived newcomer that squeezes photos smaller than anything before it.

This isn't a general format encyclopedia, we're deliberately leaving PNG out, because PNG's job is graphics and transparency, not photo delivery. This is a head-to-head for the format you actually ship photos in on a web page. Let's find out who wins, and where each one still earns its place.

The contenders in one line each

• JPEG (JPG), lossy, universal, fast to encode, opens literally everywhere. No transparency. The safe default for 30 years.
• WebP, Google's format. Smaller than JPEG at the same quality, supports transparency and animation, works in every current browser. The pragmatic winner for most sites today.
• AVIF: based on the AV1 video codec. The smallest files of the three at a given visual quality, best at low bitrates, supports transparency and wide color. Slower to encode, and support outside the browser still lags.

Compression: how much smaller, really?

The whole reason to move off JPEG is bytes. Smaller images mean faster page loads, lower bandwidth bills, and better Core Web Vitals scores. Here's the honest, real-world picture for a typical photograph at visually comparable quality:

• WebP usually lands 25–35% smaller than JPEG.
• AVIF usually lands 40–50% smaller than JPEG, and it holds that lead best on complex, detailed photos.

Two caveats matter, though. First, these are typical ranges, not promises: savings depend on the image content and the quality setting you pick. For flat graphics, simple illustrations, or images that are already small and heavily compressed, the gap between all three narrows sharply, sometimes to almost nothing. Second, "smaller at the same quality" assumes you actually tuned the quality. A carelessly exported AVIF can be larger than a well-tuned JPEG.

Quality at low bitrates: where AVIF pulls ahead

Compression ratios are only half the story. The other half is what the image looks like when you push it hard.

Squeeze a JPEG too far and you get its signature failures: blocky 8×8 tiles, "mosquito noise" shimmering around text and hard edges, and muddy color banding in skies and gradients. WebP degrades more gracefully. It tends to go soft rather than blocky. AVIF holds up best of all at aggressive settings. At the very low bitrates where a JPEG would fall apart, AVIF often still looks clean, which is exactly why it's so effective for thumbnails and hero images that need to be tiny.

There's a flip side: because WebP and AVIF lean toward smoothing, they can occasionally soften very fine texture, hairs, fabric weave, film grain. On most photos you'll never notice. On a few, a slightly higher quality setting fixes it.

Transparency and animation

JPEG simply can't store an alpha channel. Save a cut-out product photo or a logo as JPEG and the transparent areas fill in with solid color. Both WebP and AVIF support full transparency in their lossy modes, which is a real advantage when you want a photographic image with a transparent edge without the huge weight of a PNG.

For animation, both WebP and AVIF can hold animated sequences (a lighter alternative to GIF), while JPEG cannot. That said, for anything genuinely video-like, a real video file still beats an animated image format on size.

The comparison table

What matters	JPEG	WebP	AVIF
Typical photo size vs JPEG	Baseline	~25–35% smaller	~40–50% smaller
Quality at low bitrate	Blocky artifacts	Good, softens	Best, stays clean
Transparency (alpha)	No	Yes	Yes
Animation	No	Yes	Yes
Wide color / HDR	Limited	Limited	Yes
Encode speed	Fast	Fast	Slower
Browser support (2026)	Universal	All current browsers	All current major browsers
Legacy app / email support	Excellent	Limited	Poor

Encode speed and the practical costs

AVIF's efficiency isn't free. Encoding an AVIF is noticeably slower than encoding a JPEG or WebP, a difference you feel most when processing large batches or generating images on the fly on a server. For a one-off image it's a non-issue. For a pipeline churning through thousands of photos, it's a real cost to weigh.

The bigger practical gap is outside the browser. This is where JPEG's 30-year head start still counts:

• Email clients are conservative. Many still don't reliably render WebP, and AVIF support is worse. For HTML email, a well-compressed JPEG remains the dependable choice.
• Older desktop apps (legacy design, office and enterprise tools) often can't open a .webp and almost never open a .avif. This is the snag people actually hit: they download a next-gen file and a program on their computer refuses it.
• Third-party platforms and CMS plugins vary. Browser support for a format doesn't mean every upload form or preview scraper accepts it.

Browser support in 2026: the honest status

• JPEG, supported everywhere, in everything, with zero risk. It is the universal fallback.
• WebP, supported in every current browser (Chrome, Edge, Firefox, Safari, and their mobile versions), sitting comfortably above 97% of web traffic. For web delivery it's effectively safe.
• AVIF, now supported across all current major browsers, but adoption in the wider ecosystem (email, design apps, older devices, some platforms) is still catching up.

The pragmatic pattern most professionals use is layered delivery: serve AVIF to browsers that accept it, fall back to WebP, and fall back again to JPEG. The <picture> element does this automatically, and the browser picks the first format it understands:

<picture>
  <source srcset="photo.avif" type="image/avif">
  <source srcset="photo.webp" type="image/webp">
  <img src="photo.jpg" alt="Description">
</picture>

That way you get AVIF's savings where possible, WebP's savings almost everywhere else, and JPEG's guaranteed compatibility for the rare visitor on ancient software.

So which one wins?

There's no single champion. It depends on what you're optimizing for:

• Winner for most websites today: WebP. It's the best balance of real savings, fast encoding, and near-universal support. If you convert nothing else, converting your JPEGs and heavy PNGs to WebP is the single highest-value move for page speed.
• Winner for maximum savings: AVIF. Choose it when every byte counts (image-heavy pages, mobile-first sites, or hero images) and you're comfortable keeping WebP and JPEG fallbacks in place.
• Winner for compatibility: JPEG. Still the right answer for email attachments, documents, files you'll hand to a client with unknown software, and anywhere "it must just open" beats "it must be small."

The rule that ties it together: use AVIF or WebP as your web delivery copies, but always keep a JPEG (or PNG) original as your source of truth, so you can regenerate or convert back the moment something can't read the newer format.

Convert your images, free, in your browser

You don't need to guess at any of this. Try it on one of your own photos and compare the numbers. Everything below runs entirely in your browser: nothing is uploaded, nothing is stored, no sign-up.

• Ship smaller web images by converting to WebP, and use the same tool to decode a .webp back to PNG or JPG when an old app won't open it.
• Squeeze any format smaller without changing it using the image compressor, where you can dial in quality and watch the file size and preview update live to find the sweet spot.
• Need guaranteed compatibility for email or an old program? Convert PNG to JPG to get a small, universally openable file.

Serve all three, in the right order

AVIF wins the compression benchmark, WebP wins the practicality contest, and JPEG wins on sheer universality. For most sites in 2026 the smart play isn't picking one: it's serving AVIF where you can, WebP as the broad default, and JPEG as the guaranteed fallback. Pick the delivery format that fits where your image is going, keep a compatible original, and let the browser sort out the rest. Grab one of your own images and convert it to WebP to see the savings for yourself.

Where our own converter draws its line

Full disclosure about our tooling: the WebP converter encodes JPEG, PNG and WebP with Squoosh's WASM codecs in your browser, and we deliberately do not ship an AVIF encoder yet. AVIF encoding is slow enough in a tab that a bad experience would outweigh the byte savings. You can feed AVIF files IN (any image your browser decodes works as input) and get the safe trio out. When in-tab AV1 encoding matures, that calculus changes and so will the tool.

Sources

• AVIF image format support (caniuse.com)
• WebP image format support (caniuse.com)
• Image file type and format guide (MDN Web Docs)