What Is WebP? The Modern Image Format Explained
WebP is an image format developed by Google that delivers significantly smaller file sizes than JPG and PNG at comparable quality. Since gaining universal browser support, WebP has become the go-to format for web performance optimization. If you are still serving JPG and PNG on your website, switching to WebP is one of the easiest performance wins available.
How WebP achieves smaller files
WebP uses advanced compression algorithms based on the VP8 video codec for lossy mode and a custom predictive coding system for lossless mode. In lossy mode, WebP files are typically 25-35% smaller than equivalent JPG files. In lossless mode, WebP files are 26% smaller than PNG. This translates directly to faster page loads and lower bandwidth costs.
Features beyond compression
Unlike JPG, WebP supports transparency (alpha channel) in both lossy and lossless modes. It also supports animation, making it a more efficient alternative to GIF. WebP supports metadata including ICC color profiles and EXIF data. This combination of features makes it a true universal format that can replace JPG, PNG, and GIF in most scenarios.
Browser and platform support
As of 2025, WebP is supported by all major browsers: Chrome, Firefox, Safari, Edge, and Opera. iOS Safari added support in version 14, which means virtually all active iPhones and iPads can display WebP. The only notable holdouts are some legacy enterprise applications and older email clients.
How to convert images to WebP
SquishConvert makes it simple to convert any image to WebP. Upload your JPG, PNG, or other image file, select WebP as the output format, and download the result. The conversion happens in your browser for images, so your files stay private. You can also batch-convert entire folders of images to WebP.
When not to use WebP
Avoid WebP when your audience includes users on very old browsers or devices. For print workflows, stick with TIFF or PDF since WebP is designed for screen display. If you need the absolute smallest file size and your audience is on modern browsers, consider AVIF, which offers even better compression than WebP.
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