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WebP vs AVIF: Which Image Format Is Best for Your Website in 2025?

Posted by Thornwood Digital.

Website performance matters more than ever in 2025. Google prioritizes fast-loading sites, and users expect near-instant page speed. One of the biggest factors in website performance? Images.

Images often make up over 50% of a page’s total size, which means optimizing them is critical for speed, SEO, and user experience. Two modern image formats dominate the conversation: WebP and AVIF. But which one should you use?

Let’s break it down.

What Is WebP?

WebP is a next-gen image format created by Google that offers better compression than JPEG or PNG, resulting in smaller file sizes with similar visual quality.

✅ Pros of WebP:

  • Reduces file size by ~25–35% compared to JPEG/PNG
  • Supported by almost all major browsers
  • Supports both lossy and lossless compression
  • Includes transparency and animation support

❌ Cons of WebP:

  • File sizes are still larger than AVIF for equivalent quality
  • File sizes are still larger than AVIF for equivalent quality
  • Limited adoption compared to older formats

What Is AVIF?

AVIF (AV1 Image File Format) is the newest player in the game — and it’s making waves. Built on the AV1 video codec, AVIF offers unmatched compression and quality.

✅ Pros of AVIF:

  • Smaller file sizes than WebP — often 30–50% smaller
  • Superior image quality, especially for HDR and detailed graphics
  • Supports transparency and HDR color
  • Great for modern, high-resolution displays

❌ Cons of AVIF:

  • Slower encoding (takes longer to create than WebP)
  • Slightly newer — browser support isn’t 100% universal (but growing fast)
  • May require fallback formats for legacy browsers

WebP vs AVIF: Side-by-Side Comparison

  • WebP
  • ✅ Great compression (much smaller than JPEG/PNG)
  • ✅ Good image quality
  • ✅ Supports transparency and animation
  • ✅ Excellent browser support
  • ✅ Faster encoding speed (quicker to create)
  • ❌ Larger file sizes than AVIF at equivalent quality
  • AVIF
  • ✅ Best compression (smaller file sizes than WebP)
  • ✅ Superior image quality, especially for HDR
  • ✅ Supports transparency and HDR color
  • ✅ Growing browser support (already works in Chrome, Firefox, Safari)
  • ❌ Slower encoding speed
  • ❌ Limited animation support (still evolving)

Bottom line: WebP is still an excellent format, and if your website already uses it, you’re in great shape for speed and optimization. However, AVIF is the future — offering even better compression and quality, making it the next logical step for high-performing websites.

Why AVIF Is the Future

While WebP was a major upgrade from JPEG and PNG, AVIF outperforms WebP in nearly every meaningful way: smaller files, higher image quality, and better support for HDR.

As browser adoption continues to expand (it’s already supported in Chrome, Firefox, and Safari), AVIF is quickly becoming the gold standard for modern websites focused on speed and performance.

What Thornwood Digital Is Doing

At Thornwood Digital, we’re obsessed with delivering high-performing websites. That means staying ahead of technology trends that directly impact speed and user experience.

Starting now, all new websites we build will include AVIF image optimization by default.
This ensures:

  • Faster loading times
  • Better SEO performance
  • A superior user experience on any device

We’ll also continue to include fallbacks for browsers that don’t fully support AVIF, so your site looks great for everyone, everywhere.

✅ Want a site that looks stunning AND loads lightning fast?
Schedule your free website consultation today and let Thornwood Digital help you stay ahead of the curve.

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