WebP vs AVIF vs JPEG XL: The 2026 Image Format Guide

The image format landscape has shifted dramatically. JPEG and PNG served us well for decades, but three modern contenders — WebP, AVIF, and JPEG XL — are now fighting for dominance. If you've been wondering which format to adopt in 2026, this guide breaks it all down.

The Quick Version

If you're in a hurry: AVIF gives you the smallest files, WebP gives you the broadest compatibility, and JPEG XL brings the most ambitious feature set but still lacks universal browser support. Now let's dig into the details.

Compression: The Numbers That Matter

Compression performance is the main reason anyone cares about new formats, so let's start there.

AVIF

AVIF consistently delivers the most impressive compression ratios. In real-world testing, AVIF files are roughly 50% smaller than equivalent JPEG files at the same visual quality. For photographic content, this is a game-changer. A 2MB JPEG becomes a 1MB AVIF with no perceptible quality loss.

The catch? Encoding is slow. AVIF uses the AV1 video codec under the hood, and generating an AVIF file can take 5-10x longer than encoding a JPEG. For bulk processing, this matters — though tools like Small.im's AVIF compressor handle this efficiently by leveraging WebAssembly in your browser.

WebP

WebP lands in the middle ground. Expect files that are 25-35% smaller than JPEG for lossy compression. Lossless WebP typically beats PNG by 20-25% as well. Not as aggressive as AVIF, but the encoding speed is significantly faster.

Google developed WebP over a decade ago, and the format has matured nicely. If you need a reliable workhorse format that just works everywhere, WebP is hard to beat. You can compress your WebP files here or convert JPEGs to WebP in bulk.

JPEG XL

JPEG XL is the most technically impressive of the three. It matches or slightly beats AVIF for photographic content and absolutely dominates for non-photographic images (illustrations, screenshots, text-heavy graphics). Compression ratios range from 35-60% smaller than JPEG depending on content type.

The killer feature? Lossless JPEG recompression. JPEG XL can take an existing JPEG file and recompress it losslessly — reducing size by about 20% while preserving the exact original data. No other format can do this.

Browser Support in 2026

This is where things get practical.

WebP has essentially universal support. Every major browser — Chrome, Firefox, Safari, Edge — has supported it for years. If you need something that works everywhere right now, WebP is the safe choice.

AVIF has strong support across Chrome, Firefox, Edge, and Safari (since Safari 16). As of 2026, AVIF works in all modern browsers. The only edge cases are older devices running outdated browser versions.

JPEG XL has had a rocky road. After Chrome controversially removed its JPEG XL flag in 2023, adoption stalled. Safari and Firefox have added support, but Chrome's absence remains the elephant in the room. In 2026, you'll still need fallbacks if you go with JPEG XL.

HDR and Wide Color Gamut

Modern displays increasingly support HDR, and this is where AVIF and JPEG XL pull ahead.

AVIF supports 10-bit and 12-bit color depth, HDR metadata, and wide color gamuts like P3. It handles HDR content naturally since it's built on AV1.

JPEG XL goes even further with support for up to 32-bit floating point, virtually unlimited dynamic range, and sophisticated color management. For professional photography and creative workflows, JPEG XL's color capabilities are unmatched.

WebP is limited to 8-bit color depth. No HDR support. For standard web content this is fine, but if you're dealing with HDR imagery, WebP isn't an option.

Encoding Speed

Speed matters when you're processing hundreds or thousands of images.

WebP encodes fastest — roughly on par with JPEG in terms of processing time. Batch conversion of large image libraries is quick and painless.

JPEG XL comes in second. Encoding is slower than WebP but faster than AVIF for most content. The progressive decoding feature also means images appear usable before they've fully loaded.

AVIF is the slowest to encode by a significant margin. A single high-resolution image can take several seconds to encode, compared to milliseconds for WebP. Multi-threaded encoding helps, and modern tools have improved speeds considerably, but AVIF encoding will always be the most computationally intensive of the three.

When to Use Each Format

Choose WebP when:

• You need maximum browser compatibility
• Encoding speed matters (high-volume processing)
• You're serving standard web content (product photos, blog images, thumbnails)
• You want a straightforward upgrade from JPEG/PNG

Choose AVIF when:

• File size is your top priority
• You're serving bandwidth-sensitive content (mobile users, emerging markets)
• Your audience uses modern browsers
• You can tolerate slower encoding times

Choose JPEG XL when:

• You need lossless JPEG recompression for existing archives
• HDR and professional color accuracy are requirements
• You can implement format fallbacks in your image pipeline
• You're working with mixed content (photos, illustrations, screenshots)

The Practical Approach

For most websites in 2026, the smartest strategy is a format cascade: serve AVIF where supported, fall back to WebP, and keep JPEG as the final fallback. The <picture> element makes this straightforward:

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

If you're managing a large image library and want to generate multiple formats without the hassle, Small.im handles WebP compression and AVIF compression right in your browser — no uploads, no server-side processing, and no file limits.

The Bottom Line

There's no single "best" format — only the best format for your specific situation. WebP is the safe, universal choice. AVIF delivers the best compression for bandwidth savings. JPEG XL is the most capable but still waiting for full browser adoption.

The good news? You don't have to pick just one. Modern tooling makes it easy to generate multiple formats and let the browser choose. Start with WebP as your baseline, add AVIF for size-conscious delivery, and keep an eye on JPEG XL as browser support evolves.