What happens when you convert JPG to PNG
To convert JPG to PNG is to move an image from a lossy, photo-optimized format into a lossless one that stores every pixel exactly. JPG (or JPEG) was designed in the 1990s to make photographs small: it throws away fine detail the human eye barely notices, which is why a 12 MB camera photo can shrink to 2 MB with no obvious change. PNG takes the opposite approach — it compresses without discarding anything, so every pixel survives bit-for-bit. When you convert a JPG to PNG, the JPG's pixels are copied exactly: nothing is enhanced, but from this point forward nothing more is lost. Think of it as freezing your image at its current quality — dimensions stay identical, and the result is a stable file you can edit and re-save without quality drifting downward.
Why PNG: transparency and lossless quality
PNG has two advantages JPG can never offer. First, transparency: PNG supports an alpha channel, so parts of an image can be fully or partially see-through. Logos, icons, stickers, and product cutouts live as PNGs for exactly this reason — they sit on any background without an ugly white box. Second, PNG is lossless, so text, line art, and sharp edges stay crisp through any number of re-saves, while repeated JPG saves smear fine detail into blocky artifacts. If you are preparing web graphics, building a design file with many revisions, or exporting artwork to a platform that recompresses uploads, converting JPG to PNG gives you a dependable master copy that will not degrade no matter how often you open it.
The honest tradeoff: PNG files are bigger
Lossless quality costs space, and this is the one tradeoff you should expect. A photograph converted from JPG to PNG will almost always grow — often to two to five times its original size — because PNG must store every pixel exactly instead of approximating them. This growth is normal behavior, not a bug, and the converter above shows you the finished file's size before you download. If your goal is the smallest possible file for email, a blog, or social media, keep the JPG. Choose the JPG to PNG conversion when quality preservation matters more than size: for images you will edit, archive, or print.
One limit you should know: lost transparency can't come back
Here is the honest fine print. Converting a JPG to PNG cannot restore a transparent background that was flattened into the JPG. JPG has no alpha channel, so whenever an image with transparency was saved as JPG, those see-through areas were permanently filled with a solid color — usually white — at that moment. That white is now baked into the pixels. Turning the file back into a PNG preserves those pixels exactly, but it cannot know which parts used to be transparent. If you still have the original PNG, layered PSD, or AI file, export from that source instead — a JPG to PNG conversion freezes quality, but it is not a transparency recovery tool.
A practical editing workflow
Many designers convert JPG to PNG as the very first step of an editing session, and it is a habit worth copying. Say a client sends you a JPG mockup to annotate, crop, and save as a series of drafts. Saving every draft as JPG stacks compression artifacts — quality degrades with each save. Instead, convert the JPG to PNG once, do all of your editing in PNG (or your editor's native format), and export the final deliverable only at the very end: as JPG if it is a photo for the web, or as PNG if it is a graphic needing crisp edges. That single upfront conversion guarantees the image can never get worse than the file you received. For the final delivery step in the other direction — small web-ready files from PNG artwork — see our PNG to JPG converter, and compare the formats in our JPG vs PNG guide.
Using the converter — and going back the other way
Converting takes seconds. Drag your JPG into the box above, or click the box to choose a file. You will see a side-by-side preview of the original and the converted PNG, with exact dimensions and the new file size. Click "Convert to PNG", then download. There is no quality slider because PNG is always lossless, and there are no uploads — everything runs locally in your browser. Need the reverse trip, turning PNGs into much smaller JPGs? Our PNG to JPG converter handles that with a quality slider, and if a converted PNG is larger than you would like, the Compress PNG tool can shrink it without visible loss.