The PDF format is used for storing and transmitting text and graphic information on the network, for example, for transferring letterhead to the printing industry or posting a questionnaire on the website. The developers of the format set themselves the task of creating such a format for displaying the document so that the document opens and looks the same on any device. It was developed by the Adobe Systems team. PDF (Portable Document Format), is not just a well-known and convenient format, but the only one that has been standard since 2008.
png format PDF (Portable Document Format) Logos, icons, badges, diagrams, scanned copies of documents are usually placed on sites just in. png is ideal for saving images with a small number of colors, as well as graphics with transparent areas. Since October 1, 1996, it exists as a full-fledged graphic format supported by all browsers and graphic editors.PNG is one of the most popular formats due to its good compression without loss of quality, fast loading, transparency function, clear image borders. It was proposed in 1995 at the Usenet conference as a free alternative to licensed GIF. PNG is one of the popular formats in web graphics.