Converting a JPG to PNG is mostly about what happens next, not what's different right away. The image looks identical the moment you convert it — the value shows up once you start editing and re-saving, since PNG won't add another round of compression artifacts each time.
A JPG's opaque pixels stay opaque
JPG has no alpha channel, so there's no hidden transparency for a conversion to reveal. Every pixel in the output PNG is fully opaque. If you need a transparent background, use a background removal tool first, then export as PNG.
FAQ
Does converting a JPG to PNG add transparency?
No. JPG never had an alpha channel to begin with, so there's nothing to restore. Converting to PNG switches you to a format that supports transparency, but it can't invent it — every pixel comes out fully opaque, exactly as it looked in the JPG. If you need an actual transparent background, you need a background removal tool, not a format conversion.
Does this improve image quality?
No. The JPG's compression artifacts are already baked into the pixels by the time you open the file — PNG just stores those same pixels losslessly from that point forward. Converting won't undo blur or blockiness that's already there, but it does stop the picture from degrading further if you keep editing and re-saving it.
Why would I convert JPG to PNG at all?
The usual reason is a round trip through an editor: PNG is lossless, so if you're going to open the image, edit it, and save it again (maybe more than once), starting from PNG means each save doesn't add a fresh layer of JPEG artifacts. It's also useful when a tool or upload form specifically requires PNG.
Why is the PNG so much bigger than the JPG?
PNG's lossless compression can't match JPEG's lossy compression on photographic content, so the same image typically takes several times more storage as a PNG. That's the tradeoff for a format that won't degrade the picture any further.
Going the other way, for a smaller file? Try PNG to JPG.
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