Why Does WebP Exist?

WebP exists because the web’s most common image formats were designed before the modern web, and their age shows in page weight. Announced by Google in 2010, WebP was an attempt to answer one question: how do we send images that look just as good but take a fraction of the bandwidth?

The Problem WebP Set Out to Solve #

By the late 2000s, images were already the largest part of the average web page. The dominant formats had real costs:

• JPEG (1992) compresses photographs well but cannot handle transparency and degrades on text and sharp edges.
• PNG (1996) is lossless and supports transparency but is heavy for photographs.
• GIF (1987) supports animation but only 256 colours.

Websites needed a format that combined the strengths — strong photo compression, lossless support, transparency, and animation — in one container.

Where WebP Came From #

Rather than inventing a codec from scratch, the WebP team built on VP8, a video codec. A video frame (an intra-frame, or keyframe) is essentially a still image, and VP8 already contained highly optimised machinery for compressing it: spatial prediction, transforms, and entropy coding. WebP removed the video layers and applied that pipeline to still images. The result is explained in detail in WebP encoding: VP8, VP8L, and compression techniques, with the on-disk structure covered in the RIFF container and chunks.

Lossy and Lossless in One Format #

One of WebP’s defining ideas was that one container should serve every use case:

• Lossy WebP for photographs — see how lossy compression works.
• Lossless WebP for graphics and screenshots — see lossless compression in practice.
• Animation and alpha transparency on top of either.

This mattered for adoption: developers no longer had to choose between photo quality and pixel-perfect graphics, or maintain separate tooling for each.

The Modern Landscape: AVIF and Beyond #

WebP did not end the search for smaller images. AVIF, built on the AV1 video codec, achieves even better compression at the cost of slower encoding. Today the pragmatic approach is a ladder: AVIF first, WebP second, JPEG or PNG as the universal fallback. WebP’s role remains central — it is the sweet spot between compression, compatibility, and encoding speed for most sites.

Conclusion #

WebP exists because the web needed a format designed for its actual constraints: bandwidth, rendering speed, and a wildly diverse range of image content. Two decades after JPEG and PNG became standards, WebP showed that image formats could still improve dramatically — and it remains the most practical upgrade most sites can make today.