Convert JPG to PNG online, free

JPG shrinks a photo by approximating smooth gradients and fine texture with far less data. PNG refuses to approximate anything, so all that gradient and texture has to be stored more literally. A continuous-tone photo is the worst case for PNG and the best case for JPG, so the size gap is large.

The numbers you see in practice: a typical phone photo saved as a 2 MB JPG often lands between 6 and 12 MB as a PNG. A 200 KB JPG of a product shot can become 800 KB to 1.5 MB. The busier the image, the wider the gap.

If your reason for converting was to save space, this is the moment to stop. Stay in JPG, or if you need both small size and modern features, convert to WebP instead, which keeps files small and can hold transparency.

When converting JPG to PNG is the right call

The clearest case is a hard requirement. Some upload forms, asset pipelines, and older design tools accept only PNG. When the destination demands PNG, you convert, and the size cost is just the price of admission.

The second case is a lossless working copy. If you are about to edit an image through several rounds of saving, every JPG re-save degrades it a little more, an effect that compounds. Converting to PNG once, then editing and saving as PNG, freezes the quality so repeated saves cost you nothing.

The third case is flat-content images that were saved as JPG by accident. A screenshot, a logo, a diagram, or a chart belongs in PNG because it has hard edges and flat color. If one got saved as JPG, converting to PNG will not undo the JPG artifacts, but it stops the bleeding and gives you a clean format to keep editing in.

Across all three, the common thread is compatibility and editing safety, never file size or recovered quality.

When you should not convert

If the image is a photo you just want to share, post, or attach, leave it as JPG. The PNG will be several times larger for no visible benefit, and it will load slower and eat more of an attachment limit.

If you need a smaller file for a web page or an upload cap, converting to PNG moves you in the wrong direction. Either keep the JPG and compress it to a target size, or use WebP for the smallest result.

If you were hoping PNG would clean up a blocky or soft JPG, it cannot. The fix for a bad JPG is the original source file, not a format change. If no original exists, you are stuck with what the JPG kept.

The one honest exception is the flat-content case above, where PNG is the format the image should have been in all along. For continuous-tone photos headed anywhere that cares about weight, PNG is the wrong target. The MDN image format guide lays out which format suits which kind of image.

How imgkilo handles the conversion

Each JPG is decoded onto a Canvas in your browser and re-encoded as a PNG. Because PNG is lossless, the encoder writes the decoded pixels straight through with no quality setting to choose, which is why this tool has no quality slider.

There is no transparency to manage, since JPG never had any. The PNG comes out fully opaque with the same background the JPG showed. If you later need a cut-out, that is a separate editing step.

File names are preserved with the extension swapped to .png. A single file downloads immediately, and a batch arrives as a ZIP. Up to 100 files at a time, all processed in parallel right in the tab.

Nothing leaves your device at any point. The JPG is read into memory, redrawn, encoded, and handed back, so even sensitive scans or documents stay private. Free, no account, no ads.