PDF

PDF, the Portable Document Format, is a fixed-layout document format — standardized as ISO 32000 — that captures text, fonts, vector graphics, and page layout so a document renders the same on every device and platform. Created by Adobe in the early 1990s and later handed to ISO, it became the default way organizations produce, sign, archive, and exchange documents that must look identical everywhere. It is one of the most universally supported formats in computing.

• Fixed, portable layout - The document’s appearance is pinned down, so it survives the trip between viewers, printers, and platforms unchanged.
• Self-contained content - Fonts, images, and vector art can be embedded so a file needs nothing external to render correctly.
• Interactive and structured features - Forms, annotations, digital signatures, and tagging for accessibility go well beyond static print.
• Open ISO standard - Governed as ISO 32000, with subsets like PDF/A for archiving and PDF/UA for accessibility.

In API operations PDF is one of the most common outputs and inputs a service deals with — generating invoices, reports, contracts, and statements on demand, or parsing and extracting data out of uploaded documents. A whole category of document APIs exists purely to create, merge, fill, sign, and convert PDFs, which is why it shows up across so many providers in the catalog. As agents increasingly generate and consume business documents programmatically, PDF remains the format they reach for when the output has to be a faithful, portable, human-readable artifact.