pdf The .pdf file format extension was developed by Adobe systems in 1993 as a means of presenting documents in a consistent manner across different platforms, hardware, operating systems, and applications. The format was not released as an open source document format until 2008, though minimal proprietary technologies still controlled by Adobe Systems exist in the format. Every .pdf document carries with it the necessary meta information required to properly reconstruct the text, fonts, and graphics used to produce the document. This ensures that documents will be viewed in exactly the same way the author intended regardless of the device used to open the document. From conception to date, Adobe Systems has continued to support the format adding features with every iteration of the standard including hardened algorithms for document encryption and privacy. Today, many freely available readers exist allowing you to open and view .pdf documents and create or convert other file formats such as .jpeg and .doc into .pdf documents.
tiff The TIFF format was developed by the company Aldus in 1986, which was later acquired by Adobe systems who now own the rights on the format specification. TIFF, which refers to the Tagged Image File Format, is a raster graphics file format popularly used in desktop publishing and print. Its initial development goal was to create an alternative and cross platform format that would replace the numerous proprietary formats used by scanners developed in the 80's. Later revisions, after Adobe took over the development of the format, saw the TIFF format become extensible to adapt with growing and changing needs of the graphics industry. TIFF supports high color depth and is well suited to OCR applications, scanning, image editing and authoring as well as word processing. The format uses the filename extension .tiff for files stored in the format.