WebP vs AVIF vs JXL: Modern web delivery

Choosing between WebP, AVIF, and JXL is less about trends and more about browser compatibility, encoding speed, and your performance goals.

Typical file size for a high-res photo (Lower is better)

JPEG (Baseline) ~500 KB

WebP -30% ( ~350 KB)

AVIF -50% ( ~250 KB)

JPEG XL (JXL) -60% ( ~200 KB)

* Rough estimates based on high-resolution photographic images.

WebP: The dependable workhorse

WebP is universally supported across all modern browsers. It is the safest, most practical default for web development today. It supports both lossy and lossless compression, plus alpha transparency.

Pros: 100% browser support, fast encoding, roughly 30% smaller than equivalent JPEGs or PNGs.
Cons: Color banding can sometimes appear in smooth gradients compared to AVIF or JXL.
When to use: As your baseline default for all web imagery.

AVIF: The current compression king

AVIF is based on the AV1 video codec. It currently offers the best file-size-to-quality ratio supported natively by major browsers.

Pros: Unbeatable compression for low-bitrate environments, native support in Chrome, Safari, and Firefox.
Cons: Extremely slow, CPU-intensive encoding. Can blur fine details (like text) at high compression levels.
When to use: High-traffic landing pages where every kilobyte counts, especially for hero images.

AVIF Text Smoothing

Because AVIF is based on a video codec, highly compressed AVIFs can sometimes aggressively smooth or blur sharp text and thin strokes. Always visually check AVIF exports of UI components before deploying.

JPEG XL (JXL): The ultimate future

JPEG XL was designed specifically for images (unlike AVIF, which was adapted from video). It offers incredible compression without the blurring artifacts of AVIF, supports progressive decoding, and can even recompress existing JPEGs losslessly.

Pros: Stunning quality retention at small file sizes, fast encoding, progressive loading, true high dynamic range.
Cons: Safari supports it, but Chrome currently has it disabled behind experimental flags.
When to use: Apple ecosystem targeting, archival storage, and progressive enhancement setups.

A practical delivery strategy

You don't have to choose just one. You can let the browser pick the most efficient format it understands using the <picture> tag.

HTML Progressive Enhancement

<picture>
  <!-- 1. Serve JXL to Safari users (highest quality/size ratio) -->
  <source type="image/jxl" srcset="hero.jxl">

  <!-- 2. Serve AVIF to modern browsers (smallest file) -->
  <source type="image/avif" srcset="hero.avif">
  
  <!-- 3. Serve WebP to most browsers -->
  <source type="image/webp" srcset="hero.webp">
  
  <!-- 4. Fallback to JPG for legacy clients -->
  <img src="hero.jpg" alt="Product preview" width="800" height="600" loading="lazy">
</picture>