Image Format Comparison: WebP vs AVIF

Compare modern image formats and see how quality settings affect file size. Learn when to use WebP vs AVIF for optimal web performance.

WebP Format

93.2%

Average Reduction

AVIF Format

95.4%

Average Reduction

Browser Support

100%

Modern browsers

File Size Comparison

WebP Format

iOS 14+

Winner

AVIF Format

Chrome 85+

Winner

Key Insights from Chrome Performance

Modern Image Formats

AVIF and WebP are modern image formats with superior compression compared to traditional JPEG and PNG formats.

AVIF

AVIF offers superior compression with the smallest file sizes. Supported in all modern browsers (Chrome 85+, Firefox 93+, Safari 16+).

WebP

WebP provides excellent compression with wider browser support, including legacy browsers and older iOS versions (iOS 14+).

Optimization Strategies

1.Increase compression factor (30-70 quality range)
2.Use modern formats (AVIF/WebP vs JPEG/PNG)
3.Serve responsive sizes with srcset and picture elements
4.Consider using an image CDN for automatic optimization

When to Use Each Format

Choose AVIF when:

✓You need the smallest possible file size
✓Targeting modern browsers only
✓For hero images and above-the-fold content

Choose WebP when:

✓You need broader browser support
✓Balancing file size with compatibility
✓Supporting legacy iOS devices

Best Practice Implementation

Use the HTML picture element to serve AVIF with WebP fallback for maximum compatibility:

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

Learn more from Chrome Performance Insights