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2. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   A PDF file is organized using ASCII characters, except for certain elements that may have binary content. The file starts with a header containing a magic number (as a readable string) and the version of the format, for example %PDF-1.7. The format is a subset of a COS ("Carousel" Object Structure) format. [24]

3. History of PDF - Wikipedia

   en.wikipedia.org/wiki/History_of_PDF

   The Portable Document Format (PDF) was created by Adobe Systems, introduced at the Windows and OS/2 Conference in January 1993 and remained a proprietary format until it was released as an open standard in 2008.

4. PDF (file format) - Wikipedia

   en.wikipedia.org/?title=PDF_(file_format...

   Upload file; Special pages; Permanent link; Page information; Cite this page; Get shortened URL; Download QR code; Print/export Download as PDF; Printable version;

5. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   Supports a range of annotation types. Annotations are stored separately from the unmodified PDF file, or (since version 0.15 with Poppler 0.20) can be saved in the document as standard PDF annotations. Evince: GNU GPL: Yes Yes Default PDF and file viewer for GNOME; replaces GPdf. Supports addition and removal (since v3.14), of basic text note ...

6. Help:Download as PDF - Wikipedia

   en.wikipedia.org/wiki/Help:Download_as_PDF

   In the Print/export section select Download as PDF. The rendering engine starts and a dialog appears to show the rendering progress. When rendering is complete, the dialog shows "The document file has been generated. Download the file to your computer." Click the download link to open the PDF in your selected PDF viewer.

7. List of open file formats - Wikipedia

   en.wikipedia.org/wiki/List_of_open_file_formats

   An open file format is a file format for storing digital data, defined by a published specification usually maintained by a standards organization, and which can be used and implemented by anyone. For example, an open format can be implemented by both proprietary and free and open source software , using the typical software licenses used by each.