JPG to PNG Converter

This tool converts JPG (JPEG) images to PNG in your browser. It is for anyone whose editor, website builder, design tool or assignment asks for PNG, or who wants to edit an image repeatedly without it degrading a little more each time it is saved.

Two things surprise people about this conversion, so they come first. It does not improve the picture: JPG is lossy, so the detail it threw away when the photo was saved is gone, and the PNG is a perfect copy of the JPG as it is — blockiness, blur and all. And it does not make the background transparent. A JPG has no transparency at all, so the PNG has exactly the same solid background the JPG had; white stays white. Removing a background is a separate job for an editing tool, and no format conversion does it.

What PNG does give you is lossless storage. From here on, the pixels are kept exactly: you can edit, crop and re-save the PNG as often as you like without adding the new compression damage that re-saving a JPG causes. PNG is also the format many tools expect for layers of a design, for screenshots and for images you will later add transparency to.

When you click Convert to PNG, each file's first bytes are checked for the JPEG signature (FF D8 FF). Files named .jpeg, .jpe or .jfif pass too, because they are the same format; a file that is really a WebP or PNG with a .jpg name is identified and named. The browser decodes the JPG, applying the orientation tag a phone or camera stored, so a photo that appeared sideways elsewhere is saved upright. The pixels are drawn onto a canvas of the same size and encoded as PNG. There are no quality settings, because PNG has no quality loss to tune.

Expect the PNG to be larger than the JPG — for a photo often three to ten times larger, since lossless storage of photographic detail takes far more bytes than JPG's compression. The results list shows each file's size before and after.

Everything happens on your device: the images are read into browser memory, converted and handed back as downloads, and never uploaded. You can confirm in your browser's developer tools (Network tab) that no request carries your file. Convert up to 50 images per batch, each up to 50 MB.

1. Each file's first bytes are checked for the JPEG signature FF D8 FF. .jpg, .jpeg, .jpe and .jfif files all pass; any other signature is rejected with a message naming the real format. 2. The browser decodes the JPEG with createImageBitmap, applying the EXIF orientation tag so the image is upright. 3. The decoded pixels are drawn onto a canvas of the same width and height — no resizing, no background added. 4. The canvas is encoded with canvas.toBlob("image/png"). PNG compression is lossless, so the PNG holds exactly the decoded JPEG pixels. 5. The file keeps its original name with the extension changed to .png, and the size before and after is shown.