PNG is one of the popular formats in web graphics. Since October 1, 1996, it exists as a full-fledged graphics format, supported by all browsers and graphics editors. A PNG file is a bitmap image saved in the Portable Network Graphic format. Each PNG image contains a palette - a set of used colors. To reduce the file size, lossless compression using the Deflate algorithm is applied. Used primarily on the Internet as images for web pages. The biggest advantage of the PNG format is, of course, the new compression algorithms.
The Portable Document Format (PDF) is a versatile file format that preserves the fonts, images, and layout of the original document, regardless of which of many platforms and which of many applications the document was created on. It was initiated by Adobe and was originally intended for electronic presentation of printed materials. PDFs look the same no matter what device they are viewed on. Whether you're using Windows 10, Mac, Chrome OS, Android, Windows Phone, iPad, or Windows XP - on any software or hardware, PDFs remain the same.