Image Formats Compared: JPG vs PNG vs WebP

JPG (or JPEG) uses lossy compression, meaning it discards some image data permanently to achieve a smaller file size, based on how the human eye perceives color and detail. It has no support for transparency and handles hard edges or text poorly, often producing visible blocky artifacts around sharp lines. It excels at photographs and complex images with gradual color transitions, where the compression trade-offs are least noticeable and file sizes stay small.

PNG uses lossless compression — no image data is discarded, so a PNG always looks pixel-for-pixel identical to its source, at the cost of a larger file size than an equivalent JPG. Its defining feature is alpha transparency, which lets parts of an image be fully or partially see-through, making it the standard choice for logos, icons, screenshots and any graphic that needs to sit cleanly over a colored or image background. PNG is a poor choice for large photographs, since lossless compression can't shrink photographic detail nearly as much as JPG's lossy approach.

WebP, developed by Google, supports both lossy and lossless compression in a single format, along with transparency — effectively covering what JPG and PNG each do separately. At equivalent visual quality, lossy WebP files are typically 25-35% smaller than JPG, and lossless WebP files are typically smaller than equivalent PNGs. Browser support is now near-universal, which is why WebP has become the default recommendation for web images where file size affects page load speed.

The main reason JPG and PNG remain in wide use despite WebP's advantages is compatibility with older software, specific print or design workflows that expect one of the legacy formats, and cases where an image needs to be edited in tools with limited WebP support.

Use JPG for photographs headed to print or into software with limited format support. Use PNG when you need transparency or the image contains flat colors, text, or sharp edges (screenshots, logos, diagrams) where lossless quality matters more than file size. Use WebP for anything destined for a website, where smaller file size directly improves load time without a visible quality trade-off for most content.