AVIF vs WebP: Which Format Should You Use in 2026?

Quick Answer

If you're building a website: use AVIF as your primary format and WebP as your fallback, served via the HTML <picture> element. You get the best compression for the 93% of users whose browsers support AVIF, and solid WebP for the rest.

If you need a single format and can't use <picture>: WebP. It covers 97% of global browsers and compresses 25–35% better than JPEG. AVIF's extra 15–20% gain over WebP doesn't justify the 4-point coverage gap if you're choosing just one.

If you're compressing images for use outside a website (email, social media, document attachments): JPEG. Both AVIF and WebP have compatibility issues outside the browser.

What They Are

WebP

Developed by Google and released in 2010, WebP is now the de-facto modern web image format. It supports both lossy and lossless compression, transparency (alpha channel), and animation. Browser support reached 95%+ in 2021 when Safari added support, and sits at approximately 97% globally in 2026.

AVIF

AVIF (AV1 Image File Format) is derived from the AV1 video codec developed by the Alliance for Open Media. Released in 2019, it represents a significant compression advance over both JPEG and WebP. It supports lossy and lossless compression, transparency, HDR, wide colour gamut (Display P3, Rec. 2020), and 10/12-bit colour depth. Browser support reached 93% globally in 2026.

Compression: How Much Smaller Is AVIF?

AVIF consistently outperforms WebP on compression. Across real-world test sets:

In practical terms: a 500KB JPEG becomes roughly 325KB as WebP and 250KB as AVIF at equivalent visual quality. For a page with ten product images, switching from JPEG to AVIF saves roughly 2.5MB of total image weight. That directly improves Core Web Vitals scores and mobile load times.

The gap is most pronounced at lower quality settings. At high quality (90%+), AVIF and WebP are more comparable. At medium quality (70–80%) — which is where most web images live — AVIF's advantage is most significant.

Browser Support in 2026

The 4-point gap is primarily older Samsung Internet versions (pre-v20) and iOS devices still running iOS 15 or earlier. As of 2026, this group is shrinking rapidly. For most websites with a modern audience, AVIF's 93% coverage is already more than sufficient.

Encoding Speed

This is AVIF's biggest practical weakness. AVIF encoding is dramatically slower than WebP:

• JPEG: Near-instant (milliseconds)
• WebP: Fast (milliseconds to low seconds)
• AVIF: Slow (seconds to tens of seconds per image at high quality)

For a static site or build pipeline that pre-processes images, this doesn't matter much — you compress once at deploy time. For real-time browser-based compression (like our tool), AVIF encoding can take 2–5 seconds on a typical computer, which is why we show a processing indicator when you select AVIF output.

Decoding speed is a non-issue for both — both decode fast enough that the difference is invisible to users.

Feature Comparison

AVIF's HDR and wide colour gamut support matter most for high-end photography and e-commerce sites on Apple displays that support Display P3. For standard web images, you won't notice the colour depth difference — but the compression advantage is real regardless.

When to Use Each

Use AVIF when:

• You're building a modern website and can use the <picture> element with a WebP fallback
• Core Web Vitals and LCP score matter (every KB counts)
• You're serving HDR photography or product images on P3-capable displays
• You're pre-processing images in a build pipeline where encoding time isn't a constraint

Use WebP when:

• You need a single format and can't serve multiple sources
• You need fast real-time encoding (browser-based tools, CMS integrations)
• Your audience includes significant older Android or iOS 15 device traffic
• You want maximum compatibility without managing a format fallback chain

Stick with JPEG when:

• Images need to be opened in desktop apps, sent in emails, or used outside the browser
• You're sharing files that recipients may open on older devices or software
• Maximum compatibility across all software, not just browsers, is required

Try Both Right Now

Private Image Compressor supports all three formats — JPG, WebP, and AVIF — directly in your browser with no upload required. Select your image, use the format buttons to switch between outputs, and compare the file sizes live. For AVIF, you'll need Chrome or Edge; WebP and JPG work on all browsers.

Frequently Asked Questions

Is AVIF better than WebP?

For compression quality and file size, yes — AVIF is typically 20–30% smaller than WebP at the same visual quality. For browser compatibility, WebP has a small edge (97% vs 93%). For encoding speed, WebP is dramatically faster. In practice, the best answer is to use both.

Should I convert my existing WebP images to AVIF?

If you're serving a website where Core Web Vitals matter, yes — it's worth adding AVIF alongside WebP using the <picture> element. Converting all existing WebP images to AVIF-only would be a mistake, as you'd lose coverage on the 7% of browsers that support WebP but not AVIF.

Does AVIF work on iPhones?

Yes, since Safari 16 shipped with iOS 16 in September 2022. iPhones running iOS 16 or later (the majority of active iPhones in 2026) display AVIF images. Older iPhones on iOS 15 do not.