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What is a free PDF reader that allows me to add notes and annotations to documents?

PDF files contain structured data, including text, images, and fonts, which are stored in a binary format.

This structured data allows PDF readers to accurately render and display the contents of a PDF file.

The Portable Document Format (PDF) was first introduced by Adobe Systems in 1993 as a way to preserve the formatting and layout of printed documents for electronic distribution.

PDF files can contain embedded fonts, images, and multimedia, making them a versatile format for sharing and storing a wide range of documents.

PDF readers use rendering engines to accurately display the contents of a PDF file on screen.

These rendering engines can also perform tasks such as text recognition, shape detection, and font rendering.

Many free PDF readers use open-source rendering engines, such as FreeType and Ghostscript, to render PDF files.

These engines are widely used and well-maintained by the open-source community.

The PDF/A specification is a particular type of PDF that focuses on creating accessible and reliable PDF files for archiving, publishing, and processing.

Some PDF readers, such as Okular, are based on the Qt framework and use the Poppler rendering engine to render PDF files.

The Xpdf library is a popular open-source library for rendering and manipulating PDF files, and is used by many free PDF readers, including the popular SumatraPDF.

PDF files can be signed and encrypted using digital signatures and encryption algorithms, ensuring the authenticity and integrity of the document.

PDF readers may also support advanced features such as OCR (Optical Character Recognition) to recognize text within images and PDF files.

Some free PDF readers, such as Foxit Reader, offer additional features like creating and filling out PDF forms, adding digital signatures, and sharing PDF files online.

The PDF format is designed to be platform-independent, allowing PDF files to be opened and viewed on a wide range of devices and operating systems.

The PDF format has undergone several revisions, with the current version being PDF 2.0, which was released in 2017.

Many free PDF readers are available for download, including the popular Adobe Acrobat Reader, which is free to use for personal, non-commercial purposes.

Some free PDF readers may offer additional features like text search, highlighting, and annotating PDF files.

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