WebP is an open-source format for image files, raster images. Created in 2010 by Google for web graphics in order to quickly upload images to web pages. This is the main advantage of WebP files. Compression of images in this format can go with or without loss, depending on what level of quality you want to achieve. Thus, lossless compression is 26% better than in PNG files. If quality loss is acceptable, then compression in WebP format is 25-34% better than in JPEG files. Full support for WebP is not yet available on Firefox, Internet Explorer, and Safari.
PSD is a fairly common raster image format; the most popular graphic editor Adobe Photoshop is used to create files of this format. The name of the format is an abbreviation for Photoshop Document, and the developer is Adobe Systems. In other words, it is a graphic file format specially created for this program. Its feature is that it stores text information, layers, layer masks. PSD saves all layers created when working in Adobe Photoshop, and you can continue to work with them at any time. Also uses transparency and translucency options.