Most conversion guides skip the important part: whether you should convert at all. I've watched people turn a crisp 80KB JPG into a bloated 600KB PNG and wonder why their site got slower. This guide covers both the how and the why.
There are two situations where I'd genuinely recommend converting a JPG to PNG, and they're both about what you plan to do with the image next.
You need a transparent background. JPG doesn't support transparency — full stop. If you have a product photo with a white background and you need to cut it out and place it on different backgrounds, you need to switch to PNG first. There's no workaround. The white background is baked into a JPG.
You're about to edit the image repeatedly. Every time you open a JPG, make a change, and save it, it re-compresses and loses a little more detail. It's subtle at first, but after five or six rounds of editing you'll start to see muddy edges and color banding. If you're working on something iteratively — adjusting a graphic, tweaking colors, adding text layers — convert to PNG first and keep it in PNG until you're done. Export a JPG only for the final version that goes on the web.
"I converted my JPG to PNG and the file is now five times bigger. Did something go wrong?"
Nothing went wrong — that's just how it works. PNG uses lossless compression, which stores every pixel precisely. A photograph has millions of slightly different colored pixels, and storing all of them perfectly takes more space than JPG's "close enough" approach. If you're converting a photo purely to get a smaller file, PNG is the wrong direction. Try WebP instead.
If the image is a photograph that's going on a website and you just want it to look good and load fast — don't convert to PNG. You'll get a larger file with no visible quality improvement. The original JPG data that was discarded during compression isn't coming back just because you changed the container.
Similarly, if someone asks you to "send the PNG version" of a photo and you only have a JPG, converting it gives them a PNG that contains a JPG-quality image. The format change doesn't improve what was already compressed. It's worth being upfront about that.
Most online converters work by uploading your image to a server, converting it there, then letting you download the result. That works, but it means your file — whatever's in it — passes through someone else's computer. For personal photos or anything work-related, that's worth thinking about.
This converter processes everything locally in your browser. Nothing is transmitted. The conversion happens using your own device's CPU. Here's how to use it:
Head to the JPG to PNG converter. No account needed, no file size limit beyond what your device can handle.
Drag the file onto the page or click to browse. You can do multiple files at once. The conversion starts immediately — you'll see a progress indicator.
When it's done, click download. The file goes straight to your downloads folder. If you converted multiple images, you'll get a zip file.
"Converting to PNG improves quality" — this comes up a lot and it's not quite right. Converting a JPG to PNG stops further quality loss. It doesn't reverse quality loss that already happened. Think of it like freezing food: freezing doesn't fix food that's already gone bad, but it stops good food from degrading further.
So if you have an original JPG that looks good and you convert it to PNG before editing, the PNG will look exactly as good as the JPG did. When you then export back to JPG at the end, you've only gone through one round of lossy compression instead of multiple. That's the real benefit.
If your original JPG already looks bad — blurry edges, color artifacts, muddy gradients — those problems will still be there in the PNG. The format switch can't reconstruct information that was discarded.
No. PNG will preserve the exact quality of the JPG you started with, nothing more. Sharpness comes from the original image, not the format.
Yes — this is one of PNG's main advantages over JPG. Once you've converted, you can use any editing tool to remove the background and save the transparency in the PNG file.
Yes. There's no cost, no signup, and no limit on how many files you convert. I built it for myself and made it public.
Nothing is stored because nothing is uploaded. The entire conversion runs inside your browser. I have no access to your files.
Then PNG probably isn't what you need. Try converting to WebP instead — it's typically 25–35% smaller than JPG at comparable quality.
Yes. Drop them all in at the same time and you'll get a zip file with all the converted PNGs inside.
If you ran into something unexpected — a file that converted oddly, a format the tool didn't handle — let me know. I maintain this myself and I'd rather fix real problems than guess at them.