WebP statistics

by Josh Fraser on May 2, 2011

A few weeks ago we announced that Torbit has added support for WebP. As a reminder, WebP is a new image format from Google that is significantly smaller than JPEG’s of similar quality. We’ve been running Torbit with WebP support for a few weeks now and are continuing to see great results from that optimization. As promised, I want to share some of the data on what we’re seeing.

So far, we have converted 63,460 images from Torbit-enabled sites to the WebP format. Across those images, the average size before optimization was 53.6kb. After applying our standard image optimizations (stripping EXIF data, running smush.it, etc), the average size drops to 49k (91%). After converting to WebP the average drops to 22.8kb (42%). These numbers are similar to what Google saw when they performed their own study on 900,000 images. In their study, they reported that the WebP images were 39.8% smaller than JPEG images of similar quality. One thing you may notice is that our average image size is significantly larger than the average image size on the web. This is due to the fact that we are still in closed BETA and have several sites with lots of large images that are skewing our numbers.

Average image sizes on Torbit

As you can see, WebP makes an incredible impact on reducing image file sizes and improving the performance of image heavy sites. It’s unfortunate that more browsers don’t support WebP. We’ll be doing our part to evangelize the benefits of WebP and we hope to see more browser vendors add support for it in the coming months. We’ll obviously keep up with any developments and take advantage of them for Torbit customers as more browsers come on board.


  1. WebP In The Wild | Joseph Scott said at 3:50 pm on May 2nd, 2011:

    [...] Fraser posts a few WebP statistics based on serving converted JPEGs for live sites. The bottom line: the average optimized JPEG went [...]

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