Knowra Portable Document Format Portable Document Format Portable Document Format (PDF) is a file format designed to preserve a document’s layout across software, devices, and printing systems. It can combine text, graphics, fonts, images, and interactive features in one file.
PostScript : A page-description language that specifies text, graphics, and page layout for printing and display. PDF grew from Adobe’s PostScript technology, adapting its page-description approach into a portable document format.
Adobe Systems : An American software company founded in 1982 by John Warnock and Charles Geschke. Adobe developed PDF to make documents display consistently across computer systems.
PDF/X : A family of PDF standards designed for reliable exchange of print-ready files. PDF/X restricts features that can disrupt commercial printing workflows.
HTML : The markup language used to structure content on the web. HTML pages typically reflow to fit screens, unlike PDF’s fixed page layout.
PDF object model : The structure of objects, references, and streams that encodes a PDF document. This object system stores page content, fonts, images, and document relationships.
The Camelot Project : John Warnock’s proposal for a system that could capture documents and preserve their appearance across platforms. This 1991 proposal laid out the goals that led to PDF.
PDF/A : A family of PDF standards designed for long-term preservation of electronic documents. PDF/A limits dependencies on external resources and features that may hinder future rendering.
EPUB : An open ebook file format designed for reflowable text and digital publication. EPUB prioritizes adaptable reading layouts, while PDF preserves fixed pages.
PDF page description : The instructions and resources that define the appearance of a PDF page. Page descriptions let a PDF specify layout independently of the software that displays it.
John Warnock : An American computer scientist and Adobe co-founder who helped create PostScript and PDF. Warnock proposed the cross-platform document system that became PDF.
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