The JPEG Workhorse
The Joint Photographic Experts Group (JPEG or JPG) format has been the standard for digital photography for decades. It utilizes lossy compression, which means it permanently discards some data to achieve smaller file sizes. It is incredibly efficient at compressing complex color gradients found in real-world photographs. However, JPG does not support transparency, and its lossy nature means that saving the same file repeatedly will slowly degrade its quality, introducing blocky artifacts around sharp edges.
The PNG Standard for Graphics
Portable Network Graphics (PNG) was designed to replace the older GIF format. Unlike JPG, PNG uses lossless compression, meaning no data is discarded. The image looks exactly as it was created, making it perfect for graphics with sharp contrasts, such as logos, screenshots, and text-heavy images. Crucially, PNG supports an alpha channel, allowing for full transparency and semi-transparency (like drop shadows). The downside is that PNG file sizes for complex photographs are massive compared to JPGs.
Enter WebP: The Modern Challenger
Developed by Google, WebP was created specifically to make the web faster. It acts as a hybrid, supporting both lossy compression (like JPG) and lossless compression (like PNG), while also supporting transparency and animation. In lossy mode, WebP files are typically 25% to 34% smaller than equivalent JPGs. In lossless mode, they are about 26% smaller than PNGs. In 2026, WebP is supported by all modern web browsers and is the recommended format for almost all web imagery.
When to Use JPG
Despite WebP's superiority, JPG is not dead. You should use JPG when you are dealing with high-resolution photography that needs to be shared across a wide variety of platforms, older software, or printed out. Many legacy systems, enterprise software, and desktop email clients still handle JPGs much better than WebP. It remains the universal standard for sharing photos outside of web development.
When to Use PNG
You should stick to PNG when absolute pixel-perfect quality is required and file size is not a concern. This includes source files for design projects, medical imaging, and situations where you need to preserve intricate line art without any risk of compression artifacts. It is also a safe fallback for transparent web graphics if you are not using a modern CDN that automatically serves WebP to supported browsers.
When to Use WebP
If you are building a website, web app, or mobile app, WebP should be your default format. Serving WebP images will drastically improve your page load speeds, reduce your server bandwidth costs, and improve your SEO scores (as search engines heavily favor fast websites). The only reason not to use WebP on the web today is if you have a significant audience using extremely old browsers, which is increasingly rare.