What Is The Pdf File Format?

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If a file has an extension of .pdf then it most likely using the Portable

Document Format (PDF), developed by Adobe Systems, Inc. PDF files maintain the

original document formatting for both printing and viewing on a multiple

computing platforms, including Windows, UNIX and Mac.

Viewing PDFs

An easy way to view PDF files is to download the Adobe Acrobat Reader,

which is free software for viewing and printing Adobe Portable Document Format

(PDF) files on major hardware and operating system platforms.

PDF Navigation Features

Certain features built into the PDF specification allow authors to expand

the usefulness of a document. For example, you can add bookmarks, thumbnails of

each page, internal and external links, form fields, article threads, buttons

for navigation, notes to annotate information, and views to magnify or reduce a

page to fit within the user's computer screen. PDF allows users to magnify up to

800% on screen with no loss of clarity.

PDF Size and Performance

For the Web, smaller files are better since download time depends on file size.

PDF files can be optimized to reduce file sizes and can create files up to 80%

smaller than their HTML counterparts.

PDF files can be "linearized" to allow the user to start viewing the document

before it is fully downloaded, similar to the process used to deliver streaming

video over the internet.

PDF can be interwoven seamlessly into most Web sites. This combination of HTML

and PDF formats enables authors to serve content in its most appropriate format

based on the demands of content versus technology. Also, on most popular Web

servers there is no compression, translation, or filtering penalty for serving

PDF files.

PDF Security

PDF has a well-established security feature set. Authors of PDF files can

prevent users from editing, printing, and/or copying content (text and

graphics). Software developers can create their own software to read, create, or

modify PDF files without

special permission or licensing. The only condition that Adobe insists on is

that the document author's PDF security settings be respected.

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