PNG to JPG Converter - Convert PNG to JPG Free Online

What PNG to JPG Does

This tool decodes your PNG onto an in-browser canvas and re-encodes the raw pixel data with the browser's own JPG encoder. The two formats are built on opposite assumptions, and that difference is the whole story. PNG is lossless: every pixel value survives the round trip untouched, and the format carries an alpha channel, so pixels can be fully or partially transparent. JPG is lossy and has no alpha channel at all. Because of that, two things happen during conversion. First, every transparent or semi-transparent pixel has to be composited onto something opaque before encoding — this tool fills the canvas with white and draws your image on top, so a transparent background becomes a white background and a soft anti-aliased edge picks up a white fringe. Second, the JPG encoder deliberately discards visual information it judges to be less noticeable, mostly fine chroma detail and high-frequency texture. The Quality slider, which runs from 1 to 100 and defaults to 92, controls how aggressive that discarding is: higher values keep more detail and produce a larger file, lower values shrink the file and eventually leave visible ringing around sharp edges and text. What the conversion does not do is add information. It won't sharpen a soft image, it won't repair a low-resolution PNG, and it won't reduce the pixel dimensions — the output has exactly the same width and height as the input. It also can't preserve transparency in any form, and converting the result back to PNG later will not recover the detail the JPG encoder already threw away.