What Makes WebP Different
WebP is a modern image format developed by Google with one goal: make web images smaller without sacrificing quality, so pages load faster. Its key strength is that it is a single format that does everything the older formats do separately. WebP supports lossy compression (like JPG), lossless compression (like PNG), transparency (like PNG), and even animation (like GIF), all in one file type. That versatility is why it has become a default choice for performance-focused websites.
The savings are substantial. In lossy mode, WebP files are typically 25 to 35 percent smaller than JPG at the same visual quality. In lossless mode, they are around 25 percent smaller than PNG. For a website serving thousands of images, that reduction translates directly into faster load times, lower bandwidth costs, and better Core Web Vitals scores, which is why Google, the format's creator, also rewards it indirectly through page-speed ranking signals.
Technically, WebP's lossy mode is built on the intra-frame compression from the VP8 video codec, predicting blocks of pixels from their neighbors and encoding the difference, while its lossless mode uses a set of transforms and a custom entropy coder. The result reaches the same perceived quality as JPG or PNG using fewer bytes.
Browser Support and the Catch
For years WebP's biggest weakness was patchy support, but that is largely resolved: all current major browsers, Chrome, Firefox, Safari, and Edge, now display WebP natively. On the modern web you can use it with confidence. The remaining caveat is older software and legacy browsers, where WebP may not open, which is why production websites typically serve WebP with an automatic JPG or PNG fallback for the small share of clients that cannot display it.
Outside the browser, support is less universal than JPG or PNG. Some older desktop image viewers, email clients, and design tools still do not handle WebP smoothly, so for a file you are emailing or handing to someone on unknown software, JPG or PNG remains the safer choice. WebP shines specifically in its home territory: images delivered on web pages.
When to Use Lossy vs Lossless WebP
WebP gives you both compression modes, and choosing correctly matters. Use lossy WebP (around 80 percent quality) for photographs and complex images, where it replaces JPG at a smaller size. Use lossless WebP for graphics with sharp edges, text, screenshots, and logos, where it replaces PNG, and whenever you need to preserve every pixel. WebP supports transparency in both modes, so a logo can be lossless WebP with a transparent background, smaller than the equivalent PNG.
Should You Convert Everything to WebP?
For a website, converting your images to WebP (with fallbacks) is one of the most effective performance improvements available, often shrinking total image weight by a third with no visible quality change. For images that live outside the web, archives, files you share by email, assets for software that may not support WebP, the universal compatibility of JPG and PNG is still worth keeping. A common workflow is to store masters in PNG or a lossless format and generate WebP copies specifically for web delivery, getting the speed benefit without giving up compatibility elsewhere.
