Free & Easy Online To PNG Converter for the Windows, Mac and Linux Operating Systems · You can convert a JPG in Paint.NET, Photoshop or Aftereffects. You can create a transparent PNG (which can then be imported into any image editor). Once you choose a file type, the PNG converter will automatically start to convert your image, and after some time your new transparent PNG file should appear in your Paint.NET or Aftereffects file system. Step 1 — How To Convert JPG to PNG With Paint.NET · This handy program will convert your .jpg, .jpeg or .gif file to a 100% pixel-perfect PNG image. You simply need to go to Paint.NET, go to Image > Resize; or click On / Off The Filter; or press Ctrl+J and click a resized area on an image. And here are the steps to try: 1. Open your new transparent PNG image in Paint.NET 2. Change the “Image Resolution” setting to 100% and click Ok 3. Click a resized area to apply the new resolution 4. The image will be converted! 5. Download the .png file 6.