Guide

WebP vs PNG: Which Image Format is Better?

Both WebP and PNG support transparency, but WebP offers significantly smaller file sizes. This comprehensive comparison will help you choose the right format for your needs.

Quick Comparison

FeatureWebPPNG
TransparencyYesYes
Lossless CompressionYesYes
Lossy CompressionYesNo
AnimationYesNo (APNG limited)
File Size (Lossless)26% smallerBaseline
Browser Support97%+100%

File Size Comparison

WebP consistently produces smaller files than PNG, especially for lossy compression:

  • Lossless WebP: 26% smaller than PNG
  • Lossy WebP: Up to 70% smaller than PNG with acceptable quality
  • Photographic content: WebP lossy is dramatically smaller
  • Graphics with text: WebP lossless still beats PNG

Transparency Support

Both formats support alpha channel transparency, but there are differences:

  • PNG: 8-bit alpha channel (256 levels of transparency)
  • WebP: 8-bit alpha channel (same as PNG)
In practice, both formats handle transparency equally well. Your transparent PNGs will convert to WebP without any loss of transparency quality.

When to Use PNG

  • When you need 100% browser compatibility (including very old browsers)
  • For images that will be edited multiple times (lossless editing)
  • When working with software that doesn't support WebP
  • For medical imaging or other precision-critical applications

When to Use WebP

  • For web images where performance matters
  • When you want to reduce bandwidth costs
  • For responsive images and modern websites
  • When you need both transparency and small file sizes
  • For animated graphics (alternative to GIF)

Browser Support

WebP is supported by all modern browsers:

  • Chrome (since version 6)
  • Firefox (since version 65)
  • Safari (since version 14)
  • Edge (since version 18)
  • Opera (since version 11)
Only Internet Explorer lacks native WebP support. If you need to support IE, use the <picture> element with a PNG fallback.

Conclusion

For most web use cases, WebP is the better choice. It offers smaller file sizes while maintaining the same transparency support as PNG.