Side-by-Side Comparison

These are images from Google WebP Gallery. PNG8 images are 256-color images with alpha transparency (which is a maximum quality for this type) and they generally have lower quality than WebP versions.

WebP with alpha compression does quite a good job. However, "lossy" PNG compression isn't far behind and it works in all browsers (even IE6) rather than only Google's own.

PNG	WebP-lossy (with alpha)	PNG, optimized
"Yellow Rose" 1
PNG file size: 118.5 KB	WebP-lossy (with alpha) file size: 23.4 KB	Standard PNG8 file size: 29.8 KB
"baby tux for my user page" 2
PNG file size: 40.5 KB	WebP-lossy (with alpha) file size: 17.3 KB	Standard PNG8 file size: 18.5 KB
"PNG transparency demonstration" 3
PNG file size: 215.8 KB	WebP-lossy (with alpha) file size: 83.2 KB	Standard PNG24 file size: 112.6 KB. Standard PNG8 file size: 46.3 KB
"Gregor Mendel's 189th Birthday" 4
PNG file size: 63.3 KB	WebP-lossy (with alpha) file size: 24.2 KB	Standard PNG8 file size: 15.9 KB
"Transparent compass card for overlays" 5
PNG file size: 127.1 KB	WebP-lossy (with alpha) file size: 67.7 KB	Standard PNG8 file size: 15.8 KB

Credits for the images

The images on this page come from a number of different sources. Credits for the images above are listed here in order.

Reproducing the images

ImageAlpha (using new pngquant) + ImageOptim.