WebP is a modern image format developed by Google specifically to replace both JPEG and PNG on the web with something more efficient at either job. Unlike JPEG, WebP supports two distinct compression modes — lossy, similar in principle to JPEG but generally more efficient at the same visual quality, and lossless, which behaves like PNG but usually packs the same pixel data into a smaller file. Just as importantly, WebP carries a full alpha (transparency) channel in both modes, something JPEG has never supported. That combination is why converting a PNG to WebP does not force the same compromise that converting a PNG to JPG does: you keep the transparency, and you still come out with a meaningfully smaller file.
In practical terms, WebP files typically run 25–35% smaller than an equivalent PNG at a comparable level of visual quality, and the gap can be larger for images with flat colors, sharp edges, or large areas of transparency — exactly the kind of content PNG was designed around. That size difference is not a rounding error once you are serving images to real visitors: it shows up directly in Core Web Vitals metrics like Largest Contentful Paint, which Google's search ranking systems and Lighthouse/PageSpeed scoring both weigh, and it adds up quickly across a CDN serving thousands of image requests a day, where every percentage point of savings on hero images, product photos, and icon sets translates into lower bandwidth cost.
Browser support for WebP is no longer a meaningful concern for a general audience — every current version of Chrome, Firefox, Safari, and Edge decodes it natively, and has for years. The caveat worth knowing is that some older or more specialized software still cannot read it: certain legacy image editors, some email clients that render images oddly, a handful of older CMS media pipelines, and various desktop tools that have not been updated in a while may choke on a .webp file or fail to preview it. If you are publishing to the open web this is rarely an issue; if you are handing a file to a client whose toolchain you do not control, it is worth checking first or keeping a PNG fallback on hand.
Quality settings on this converter run from 40% to 100%, mirroring how JPEG quality works but generally producing a smaller result at any given setting. A range of 80–85% is a strong default for photographic or photo-like content — visually close to lossless at a fraction of the size. Sharper graphics, logos, or anything with fine text benefits from pushing that up to 90–95%, since WebP's lossy mode can still introduce mild softening around hard edges at lower settings, the same category of artifact JPEG produces, just generally less pronounced at an equivalent file size.
Need a fallback for older software? PNG to JPG is the more universally compatible option, though without transparency.
