At RebelMouse, we're traffic junkies that work every day to make sure our clients have the best-performing sites on the open web, often beating out industry giants on speed. It's why the sites in our network receive 90+ performance scores via Google PageSpeed Insights.

Due to our commitment to delivering the highest-performing sites on the web, all of the images we host use Google's WebP format. We convert all GIF, JPEG, and PNG images to Google's next-generation image format, too.

According to Google, WebP lossless images are 26% smaller in size compared to PNGs. WebP lossy images are also 25–34% smaller than comparable JPEG images. For more information on the new format, click here .

It's vital for high page speed to serve next-generation image formats. Here's how a page that's not using WebP images performs according to Google's PageSpeed Insights tool:

As you can see, common image formats return a number of penalties. By contrast, here's how a page performs when it uses Google's next-generation image format:

In these results, the only penalties that result are from the logo, ads, and Amazon assets embedded in the article. By using WebP, we're able to shave valuable seconds off of the load time.

Every image you upload into our Entry Editor will be converted into the WebP format:

You can crop and resize WebP images with Entry Editor's photo editor as well. For browsers that don't support WebP, we fall back to non-next-generation image file types. If you have any questions about Google's WebP image format, email support@rebelmouse.com or talk to your account manager today.

Click here to read more about how we support SEO-friendly image filenames.