What Is WebP? The Modern Image Format Explained

WebP is an image format developed by Google that provides superior lossless and lossy compression for images on the web. Since its release in 2010, it has become the go-to format for web optimization.

How WebP Works

WebP uses predictive coding to encode an image. For lossy compression, it uses a method based on VP8 video codec technology. For lossless compression, it uses techniques like advanced entropy coding and transform coding to achieve smaller files than PNG.

Key Advantages

• Smaller files: WebP lossy images are 25-34% smaller than comparable JPEG images. Lossless WebP images are 26% smaller than PNGs.
• Transparency: WebP supports alpha channel transparency, unlike JPEG.
• Animation: WebP supports animation, offering a lighter alternative to GIF files.
• Both lossy and lossless: One format handles both compression types.

Browser Support

As of 2026, WebP is supported by over 97% of browsers worldwide, including Chrome, Firefox, Safari, Edge, and Opera. The only notable holdout is very old browser versions that are rarely used.

When to Use WebP

• Website images: Use WebP as your default format for all web images.
• E-commerce product photos: Faster loads mean better conversion rates.
• Blog and content images: Reduce bandwidth costs while keeping quality high.
• Social media: Some platforms now accept WebP uploads directly.

When NOT to Use WebP

• Print design: Use TIFF or high-quality PNG for print workflows.
• Professional photography: RAW or TIFF formats preserve maximum editing flexibility.
• Email attachments: JPG is more universally supported in email clients.

Converting to WebP

Converting your existing JPG and PNG images to WebP is straightforward. With ImgPressr, you can batch convert images to WebP directly in your browser — no upload needed, completely free.