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Blogger Image Optimization: Convert Images to WebP Format

Learn how to convert Blogger images to WebP format using hidden URL parameters to reduce file size and speed up your site loading time.

Why Optimize Blogger Images?

Image-heavy blogs often load slowly, especially those sharing photography, travel, or wallpapers.

Fortunately, Blogger supports a hidden trick that lets you convert images into WebP format automatically—reducing file size dramatically while maintaining quality.

What Is WebP?

WebP is a modern image format developed by Google. It delivers smaller file sizes than JPG or PNG with minimal quality loss and is now supported by nearly all major browsers.

Using WebP improves both page speed and SEO ranking.

Understanding Blogger Image URLs

When you upload an image to Blogger, it’s hosted on Google’s image service with a structured URL. For example:

https://blogger.googleusercontent.com/img/b/....../s1600/image.png

The portion s1600 defines the image size. By adding the parameter -rw, you can tell Blogger to serve a WebP version of the image.

Related Reading:

How to Convert to WebP

Add the parameter “-rw” at the end of your Blogger image URL.

Example:

https://blogger.googleusercontent.com/img/b/....../s1600-rw/image.png

Compose mode

https://blogger.googleusercontent.com/img/a/......=s16000-rw

Performance Comparison

Here’s a comparison of file sizes before and after applying WebP conversion:

Format Before After
JPG 237 KB 43 KB
Compressed JPG (80%) 52 KB 40 KB
PNG 727 KB 611 KB

On average, using WebP can reduce image size by 70–90%, significantly improving page load speed.

Additional Tips & Notes

  • GIF → use -rwa instead of -rw.
  • Even uploaded WebP files need -rw to display properly.
  • iOS 14 or below may not support WebP fully; fallback to JPG if necessary.
  • For many old posts, consider bulk-replacing URLs using scripts or template edits.

Conclusion

By simply appending -rw to Blogger image URLs, you can automatically convert them to WebP—improving speed and SEO with zero quality loss. For older content, you may automate updates using regex or template replacements.