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WebP Guide 2026-09-15 6 min read

What Is WebP and Why Does Google Prioritize It for SEO?

Google PageSpeed Insights flags unconverted images with 'Serve images in next-gen formats'. Here is why WebP is central to Google's vision for a faster web.

In Short

WebP is an open graphic format developed by Google that provides 26% smaller file sizes than PNG and 25%–34% smaller sizes than JPEG at identical quality. Because WebP speeds up mobile page rendering, Google explicitly rewards WebP-optimized sites with higher search visibility.

The Technology Behind WebP

WebP utilizes predictive coding from video compression to forecast colors from surrounding blocks. This eliminates redundant spatial data far more efficiently than older Discrete Cosine Transform algorithms.

Frequently Asked Questions

Does WebP support transparency like PNG?

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Yes. WebP includes full 8-bit alpha channel transparency support while keeping file sizes up to 3 times smaller than standard PNGs.

TM
ToolMatic Engineering Team

Authored by the ToolMatic web engineering team specializing in client-side performance, image encoding algorithms, and web privacy.

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