Image Format Converter - WebP to PNG, JPG to WebP & More

What Convert Format Does

Convert Format decodes each image onto an in-browser canvas and re-encodes the pixel data into a different file container using the browser's own image encoder. Nothing is uploaded — the decode-and-re-encode cycle runs locally, which is why large or sensitive files never leave your machine. The three target formats behave very differently at the encoding stage. PNG is lossless: every pixel is preserved exactly, transparency (the alpha channel) survives, and file size depends only on how compressible the image content is — photos stay large, flat graphics compress well. JPG has no alpha channel at all, so any transparent or semi-transparent pixel is flattened onto an opaque background before encoding; JPG is also always lossy, discarding some visual detail according to the Quality setting to shrink the file. WebP supports both alpha transparency and a quality-driven lossy encoder in the same format, which is why it typically produces the smallest files of the three at a comparable visual quality. Converting a format is not the same as restoring information that was never there — turning a JPG into a PNG makes it lossless from that point forward, but it does not recover detail the JPG encoder already discarded, and it does not add transparency where none existed. Converting an animated GIF to PNG, JPG, or a static WebP captures a single frame; the animation itself is not carried over.