The Portable Document Format (PDF) is a file format developed by Adobe in the s to present documents, including text formatting and images, in a manner. Invented by Adobe Inc. and perfected over more than 25 years, Portable Document Format (PDF) is an open standard for electronic document exchange. Stands for "Portable Document Format." PDF is a file format designed to present documents consistently across multiple devices and platforms.
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The abbreviation PDF stands for Portable Document Format that is a multi-format file format developed by Adobe Systems. PDF captures formatted documents. PDF (Portable Document Format) is a file format that has captured all the elements of a printed document as an electronic image that you can view, navigate. Format Description for PDF_family -- PDF (Portable Document Format), developed by Adobe Systems Incorporated. PDF represents formatted, page- oriented.
PDF captures formatted documents such as images, fonts, document texts and even does formatting of documents from variety of Desktop Publishing Applications. The greatest advantage of PDF is that it contains color-accurate information, it prints the documents as it is as they appear on your screen.
PDF. Three letters that changed the world.
The history of PDF files dates back to when the idea was discussed for the first time. However, it was not until that Adobe systems introduced their first Acrobat 1. The current PDF format has actually evolved from a page description language that already existed in early 90s and was known as PostScript.
A future scientist with the name of Dr. It was developed by Adobe and has since become one of the most widely used formats for saving and exchanging documents.
A PDF file can store a wide variety of data , including formatted text, vector graphics , and raster images. It also contains page layout information, which defines the location of each item on the page, as well as the size and shape of the pages in the document.
This information is all saved in a standard format, so the document looks the same, no matter what device or program is used to open it. The PDF format also supports metadata , such as the document title, author, subject, and keywords. It can store embedded fonts so you do not need to have the appropriate fonts installed to the view the document correctly.
PDF documents may also be encrypted so only authorized users can open them. Basically, it consists of an Optional Content Properties Dictionary added to the document root. This dictionary contains an array of Optional Content Groups OCGs , each describing a set of information and each of which may be individually displayed or suppressed, plus a set of Optional Content Configuration Dictionaries, which give the status Displayed or Suppressed of the given OCGs.
Security and signatures[ edit ] A PDF file may be encrypted for security, or digitally signed for authentication.
The user password encrypts the file, while the owner password does not, instead relying on client software to respect these restrictions. An owner password can easily be removed by software, including some free online services. Even without removing the password, most freeware or open source PDF readers ignore the permission "protections" and allow the user to print or make copy of excerpts of the text as if the document were not limited by password protection.
Not only can they restrict document access but they also reliably enforce permissions in ways that the standard security handler does not. The signature is used to validate that the permissions have been granted by a bona fide granting authority.
Adobe Reader verifies that the signature uses a certificate from an Adobe-authorized certificate authority. Any PDF application can use this same mechanism for its own purposes.
Metadata[ edit ] PDF files can contain two types of metadata. This is stored in the optional Info trailer of the file.
PDF - Portable Document Format
A small set of fields is defined, and can be extended with additional text values if required. This method is deprecated in PDF 2.
In PDF 1. This allows metadata to be attached to any stream in the document, such as information about embedded illustrations, as well as the whole document attaching to the document catalog , using an extensible schema. Usage restrictions and monitoring[ edit ] PDFs may be encrypted so that a password is needed to view or edit the contents.Redact them to permanently delete sensitive information.
PDFs can contain links and buttons, form fields, audio, video, and business logic. In PDF 1.
Are PDF files vector or raster files?
Some situations in which PDF files are desirable include:. The Committee is concerned about the stability of the XFA specification PDF captures formatted documents such as images, fonts, document texts and even does formatting of documents from variety of Desktop Publishing Applications.