WebP vs AVIF: The Next-Gen Image Format Showdown

WebP vs AVIF: Which Modern Format Should You Choose?

JPG has dominated the web for over 30 years. WebP arrived in 2010 to challenge it. Then AVIF entered in 2020 and pushed compression efficiency even further. In 2026, both WebP and AVIF are viable alternatives to JPG — but they make different trade-offs. Here is exactly what separates them.

What Is WebP?

WebP is an image format developed by Google, released in 2010 and based on the VP8 video codec. It supports both lossy and lossless compression, full alpha transparency, and animation. WebP was designed as a direct replacement for JPG (for photos) and PNG (for graphics with transparency).

Key characteristics:

• Lossy mode: ~25–35% smaller than equivalent JPG
• Lossless mode: ~26% smaller than equivalent PNG
• Full alpha transparency support
• Animation support (replacing GIF)
• Fast encoding — similar speed to JPG
• 97%+ browser support in 2026
• Supported in all major design tools

WebP struck the right balance of compression improvement and compatibility. By 2026 it has near-universal adoption: Chrome, Firefox, Safari (since version 14), Edge, and Opera all support it. Nearly every web project can safely serve WebP today.

What Is AVIF?

AVIF (AV1 Image File Format) is a much newer format, standardized in 2019 and entering practical use around 2020–2021. It is derived from the AV1 video codec — the same technology that powers efficient video streaming on YouTube and Netflix. AVIF achieves substantially better compression than WebP, especially at lower quality settings.

Key characteristics:

• 20–50% smaller than WebP at equivalent visual quality
• Significantly better than JPG (often 50% smaller or more)
• Full transparency support
• Animation support
• Slower encoding than WebP — significantly so at high quality
• ~92% browser support in 2026 (with some caveats)
• Excellent quality at very low bitrates

AVIF's compression efficiency comes from the sophistication of the AV1 codec, which was developed with enormous resources by the Alliance for Open Media (Apple, Google, Microsoft, Mozilla, Netflix, and others). That sophistication has a cost: encoding is CPU-intensive and slow compared to both WebP and JPG.

File Size: The Numbers

At equivalent visual quality (measured by SSIM or DSSIM), typical results across a range of photographic images:

Source	JPG	WebP	AVIF
Landscape photo (1920x1080px)	280 KB	195 KB	120 KB
Portrait photo (1080x1350px)	180 KB	125 KB	75 KB
Product photo on white	95 KB	65 KB	38 KB
Graphic with flat colors	55 KB	38 KB	22 KB

These figures show the consistent pattern: AVIF is 20–50% smaller than WebP, and WebP is 25–35% smaller than JPG. For a site with hundreds of images, the cumulative bandwidth and storage savings with AVIF are significant.

Browser Support in 2026

WebP: ~97% global support

• Chrome 32+, Firefox 65+, Safari 14+, Edge 18+, Opera 19+
• Only very old browser versions lack support
• Safe to use without a fallback for most projects

AVIF: ~92% global support

• Chrome 85+, Firefox 93+, Safari 16+, Edge 121+
• The ~8% gap is mainly older Safari versions on iOS/macOS prior to 2022 updates
• Some older Android WebView instances also lack support
• Requires a <picture> fallback for full compatibility

The 5-point gap between 97% and 92% represents real users, primarily on unupdated iOS devices. Whether that matters depends on your audience.

Encoding Speed

This is the most significant practical difference when generating images at scale.

WebP encoding is fast — comparable to JPEG encoding. A 2-megapixel image typically encodes in under 100ms on modern hardware. This makes real-time WebP conversion practical in both server-side pipelines and browser-based tools.

AVIF encoding is substantially slower, especially at higher quality settings. The same 2-megapixel image can take 1–5 seconds at high quality using standard encoders. Highly optimized encoders (like libaom with speed presets) can reduce this, but AVIF will always be slower than WebP.

For batch processing a library of thousands of images, AVIF encoding can take significantly longer — a factor worth planning around.

Quality at Low Bitrates

AVIF's biggest technical advantage is quality at low bitrates. When you push compression very hard — targeting file sizes that would produce obvious JPG artifacts — AVIF holds detail and smooth gradients much better than WebP, and far better than JPG.

At moderate quality settings (where most web use cases live), the visual difference between WebP and AVIF is small and often imperceptible at normal viewing distances. AVIF's advantages become most pronounced at aggressive compression levels, making it particularly valuable for mobile web where bandwidth is constrained.

The <picture> Fallback Pattern

For maximum compatibility, serve AVIF with WebP and JPG fallbacks using the HTML <picture> element:

<picture>
  <source srcset="image.avif" type="image/avif" />
  <source srcset="image.webp" type="image/webp" />
  <img src="image.jpg" alt="Description" width="800" height="600" />
</picture>

Browsers pick the first format they support. A Chrome user gets AVIF. An older Safari user gets WebP. A very old browser gets JPG. This pattern requires serving three versions of each image but delivers the best experience across the full browser range.

When to Use WebP

• Existing web projects where you need fast, easy modernization from JPG/PNG
• Real-time image generation where encoding speed matters
• Broad compatibility without managing multiple format versions
• Animated images replacing GIF — WebP animation is well-supported
• Design tool exports — most tools now export WebP natively

Convert your existing images to WebP with PixConvert's JPG to WebP or PNG to WebP converters.

When to Use AVIF

• New web projects where you can build the delivery pipeline from scratch
• Mobile-heavy audiences where bandwidth savings have the largest impact
• Large image libraries where storage costs matter
• High-quality photos where compression artifacts are unacceptable
• Projects already implementing <picture> fallbacks — the infrastructure cost is already paid

Convert images to AVIF or back with PixConvert's JPG to AVIF and AVIF to JPG converters.

The Verdict

WebP is the pragmatic choice for 2026. It delivers meaningful compression improvements over JPG and PNG, encodes quickly, and works everywhere. If you are modernizing an existing site or need broad compatibility without complexity, WebP is the right call.

AVIF is the technically superior choice when encoding time is not a constraint and you want the best possible compression efficiency. For new projects with modern infrastructure and a mobile-first audience, AVIF plus a WebP fallback delivers the best results.

The two formats are complementary rather than competitive. Many high-performance sites serve AVIF where supported and fall back to WebP — getting the best of both.