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History of PDF. The Portable Document Format (PDF) was created by Adobe Systems, introduced at the Windows and OS/2 Conference in January 1993 and remained a proprietary format until it was released as an open standard in 2008. Since then, it is under the control of International Organization for Standardization (ISO) Committee of volunteer ...

DigiSigner: free online PDF viewer java applet with additional function to digitally sign PDF documents. Docstoc: a web service which allows viewing PDF documents online. Issuu: a web service which allows viewing PDF documents online. Google Docs: a web service which views PDF documents as PNG images in the browser.

Acrobat Messenger is a document utility for Acrobat users that was released by Adobe Systems in 2000 to convert paper documents into PDF files that can be e-mailed, faxed, or shared online. Acrobat Reader Touch is a free PDF document viewer developed and released on December 11, 2012, by Adobe Systems for the Windows Touch user interface.

PDF/A. PDF/A is an ISO -standardized version of the Portable Document Format (PDF) specialized for use in the archiving and long-term preservation of electronic documents. PDF/A differs from PDF by prohibiting features unsuitable for long-term archiving, such as font linking (as opposed to font embedding) and encryption. [1]