What Is The Pdf File Format?
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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