JPG to WebP Converter - Convert JPG to WebP Online Free

What JPG to WebP Does

This tool decodes each JPG onto an in-browser canvas and re-encodes the resulting pixel data as a WebP using the browser's own WebP encoder. Nothing is uploaded — the entire decode-and-re-encode cycle runs on your machine, so large batches and files you'd rather not hand to a server both stay local. The reason to do this at all is size: at a comparable perceived quality, WebP's lossy encoder generally produces files 25-35 percent smaller than JPEG's, which is why it has become the default format for images served on the web. There is one thing worth understanding before you convert anything important. A JPG is already the output of a lossy encoder — detail was discarded when the file was first saved — and re-encoding it as a lossy WebP runs the surviving pixels through a second round of lossy compression. The two passes stack rather than cancel out. The WebP encoder has no knowledge of the original detail; it only sees the artifacts the JPEG pass left behind, and it compresses those along with everything else. In practice this means keeping the Quality slider high, and not repeatedly converting JPGs that have already been compressed hard, since each pass compounds the softening and ringing around edges, text, and flat color boundaries. Two more limits follow from the source format. JPG has no alpha channel, so the WebP that comes out will be fully opaque — converting cannot create transparency that was never in the file. And conversion does not resample: the output keeps the same pixel dimensions as the input, only the encoding changes.