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How do I convert a PNG file to PDF? To convert a PNG file to PDF on a Windows PC, right-click the PNG file and select Print > Microsoft Print to PDF > Print. Then, name the file and select Save. On a Mac, open the image in Preview, then select File > Export as PDF, name the file, and click Save. How do I convert a PNG file to JPG? To convert a PNG file to JPG in Windows, open the image in Paint and select File > Save as, then choose JPEG. On a Mac, open the image in Preview and select File > Export, then choose JPEG.