JPG to PNG Converter - Convert JPG to PNG Online Free

What JPG to PNG Conversion Does

This tool decodes your JPG onto an in-browser canvas and re-encodes the resulting pixels as a PNG using the browser's own encoder. Nothing is uploaded — the whole decode-and-re-encode cycle runs on your device. The two formats differ in ways that explain almost everything you'll notice about the result. JPG is a lossy format with no alpha channel: the encoder throws away visual detail to shrink the file, and it stores no transparency information at all. PNG is lossless and does support alpha: every pixel handed to the encoder comes back out exactly as it went in, and file size depends purely on how compressible the image content is. That difference is why converted files are usually larger, often several times larger for photographs. A photo is full of fine noise and gradients that PNG's lossless compression cannot discard, while JPG was free to smooth them away. Flat graphics, screenshots, logos, and line art compress far better and sometimes come out close to the original size. It's worth being clear about what the conversion does not do. It does not restore detail the JPG encoder already discarded — that data is gone from the file, and re-encoding it losslessly just preserves the damage more faithfully. It does not create a transparent background, because a JPG has no transparency to carry over; every pixel arrives fully opaque. What you get is an exact, lossless copy of the image as it exists right now, one that stops accumulating compression artifacts from this point forward.