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The PDF format is a fixed-page format that is very popular among users and widely supported by various applications, because a PDF document looks the same on any device. PDF and XPS formats are very similar in their purposes and basic concepts, while internally they are quite different. For that reason, editing PDF is an important feature of GroupDocs.Editor.
Various document viewing or publishing applications allow users to open (Adobe Acrobat, XPS Viewer), and sometimes edit (Adobe InDesign) documents of specific formats. These applications typically produce so-called “fixed-page” format documents. Such a document format describes precisely where a document’s content is placed on every page. Internally, the PDF format contains a description of every page, as well as drawing instructions, specifying the layout of the content on the page. This is similar to image formats, describing where the content is shown either in raster or vector form.
PDF is a complex format. Several stages of calculations are required in the process of converting a document to PDF, including the layout calculation. Since these stages include complex computations, they are time-consuming. Also, the PDF format is rather complex by itself. It has a specific file structure, graphics model and font embedding. Moreover, it features some complex output functionality, such as document structure tags, encryption, digital signatures, and editable forms.
In order to make a PDF editable, the GroupDocs.Editor uses advanced and complex algorithms, optical recognition, machine learning, and so on, so on the result users are able to edit all content of the document like an ordinary WordProcessing or textual document. This works whenever or not the PDF documents have textual layer, internal semantic structure (as described in PDF/A-1a, PDF/A-2a, and PDF/UA-1 formats), support search/find operations and so on.
There are also some drawbacks. First of all, making a PDF document editable is a very complex computational task, it requires a lot of processing time, so such documents are opening much longer then of other formats. Second, our conversion algorithms are very advanced, but they cannot guarantee perfect quality, which very much depends on a document's content, its structure, internal semantics and so on. We’re constantly improving our conversion mechanism, it now supports all common document structures like paragraphs, images, tables, lists, headers and footers, footnotes, page numbers, and many more.
Portable Document Format (PDF) is a type of document created by Adobe back in 1990s. The purpose of this file format was to introduce a standard for representation of documents and other reference material in a format that is independent of application software, hardware as well as Operating System. PDF files can be opened in Adobe Acrobat Reader/Writer as well in most modern browsers like Chrome, Safari, Firefox via extensions/plug-ins.
You can also edit many other file formats. Please see the complete list below.