WebP has quietly become one of the most common image formats on the modern web, even though many people browsing the web have never consciously noticed it. Understanding what it actually does differently from older formats explains why so many sites have adopted it for the file-size savings alone. It's a genuinely practical upgrade over older formats, not just a theoretical improvement that rarely shows up in practice.

What WebP actually is

WebP is an image format developed by Google, designed specifically to produce smaller files than JPEG and PNG while supporting the best features of both: it offers lossy compression (like JPEG) for photographs, lossless compression (like PNG) for graphics, and transparency support in both modes — combining capabilities that previously required choosing between separate formats.

How it achieves smaller file sizes

WebP uses more advanced compression techniques than the decades-old JPEG and PNG standards, developed with the benefit of newer research into both compression algorithms and models of human visual perception. In practical terms, this generally translates to WebP files running noticeably smaller than an equivalent-quality JPEG or PNG of the same image — commonly cited figures suggest lossy WebP files run meaningfully smaller than comparable JPEGs, and lossless WebP files smaller than comparable PNGs, though the exact savings vary by image content.

Current browser support

All major modern browsers — Chrome, Firefox, Safari, Edge — support WebP natively at this point, which is a significant shift from WebP's early years, when spotty support (particularly in older Safari versions) made many publishers hesitant to adopt it as a primary format. This broad support is the main reason adoption has accelerated: the file-size benefit is no longer offset by meaningful compatibility risk for the vast majority of visitors.

Why some sites still don't use it exclusively

Even with strong browser support, some publishers keep JPEG or PNG as a fallback for a small remaining share of older browsers or specific tools (certain image-editing software, older content management system plugins) that still don't handle WebP smoothly. The common practical setup — serving WebP by default with an automatic fallback to JPEG or PNG where needed — captures WebP's file-size advantage for the large majority of visitors without fully abandoning compatibility for the rest.

How to check whether a specific image is already WebP

A file's extension usually gives it away (.webp), but when that's not available, most operating systems' built-in image preview or "get info" tools show the actual format, not just relying on the filename, which can occasionally be inaccurate if a file was renamed at some point. Confirming actual format this way is a quick, useful check before assuming a file needs conversion when it may already be in the desired format.

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Frequently asked questions

Does WebP support animation, like GIF?

Yes, WebP supports animation, and animated WebP files are typically significantly smaller than an equivalent animated GIF at similar visual quality, which is one more reason it's increasingly used as a GIF replacement.

Is WebP a lossy or lossless format?

Both — WebP supports lossy compression (for photos, similar to JPEG) and lossless compression (for graphics, similar to PNG) within the same format, which is one of its key advantages over needing to choose between separate formats.

Do I lose anything by switching from JPEG to WebP?

For most practical purposes, no — WebP generally matches or exceeds JPEG's visual quality at a smaller file size. The main consideration is confirming that any specific tools or older systems in your workflow handle WebP files properly. As adoption continues to grow, it's increasingly common for design and development tools to default to WebP automatically during export, which is one more sign of how thoroughly it's become a standard part of everyday image workflows rather than a specialized, optional choice. For most publishers today, the practical question has shifted from whether to use WebP at all toward simply confirming a sensible fallback exists for the small remaining share of visitors on older software.