PDF files may be created natively, converted from other electronic formats, or digitized from paper. Businesses, governments, libraries, archives, and other institutions and individuals around the world use PDF to represent considerable bodies of important information. These PDF files should be made accessible to users with disabilities. Beyond alternative descriptions for images the accessibility of an electronic document depends on a variety of semantic information describing the logical structure and organization of the page content into sections, paragraphs, lists, tables and so on. The PD ..read more

Using Tagged PDF for Accessibility and Reuse in PDF 2.0 The primary purpose of this specification is to define how to represent electronic documents in PDF 2.0 files in a manner that allows the file to be reusable and accessible across a wide spectrum of possible use-cases. There is a large overlap between the requirements for reuse and accessibility. However, some requirements are critical for reuse whereas others are critical for accessibility. This document clearly identifies the requirements for each use-case via a conformance level mechanism. WTPDF identifies the components that shall, sh ..read more

The latest PDF 2.0 standard (ISO 32000-2:2020) is now available at no cost. For additional reference, this page serves as an index of the evolution of the PDF format, and includes external links to all legacy Adobe PDF references and errata, as well as to the ISO 32000 family of standards. PDF Version Year Reference Documents ISO 32000-2:2020 (PDF 2.0) 2020 ISO 32000-2:2020 Document management — Portable document format — Part 2: PDF 2.0 Errata: ISO and industry-based resolutions for issues against ISO 32000-2:2020 ISO Technical Specification Extensions to PDF 2.0: ISO/TS 32001:2022 D ..read more

This extension extends the popular Visual Studio programming editor with PDF syntax awareness, and is designed to support those learning PDF as a page description language. Although PDF is technically not a pure text format, creating and experimenting with simple, text-based PDF files is a great way to learn PDF. Adding this extension into the VSCode development environment now makes this even easier. At a high level, the features of the PDF COS syntax support extension for VSCode include: Color-coded syntax highlighting An outline tree navigation view of the PDF file showing the physical fil ..read more

To help developers whose relationship with PDF’s specification is casual or tangential, the PDF Association provides free PDF “cheat sheets”  to aid in remembering key terms and concepts without constantly referring to ISO 32000. What these cheat sheets are not These cheat sheets don’t introduce PDF technology, and don’t substitute for an initial learning phase. Nor do they displace the official core PDF specification. Where the cheat sheets don’t address a subject in sufficient detail, developers should always refer to the latest ISO 32000-2 (now available at no cost), as this is the lat ..read more

The Arlington PDF Model is a free and open-source machine-readable data model of all PDF objects available via GitHub. It is directly derived from the latest PDF 2.0 specification ISO 32000-2:2020 and its related resolved errata. and thus is entirely vendor- and implementation neutral. It represents the full PDF document object model (DOM) in an easy-to-process structured definition (as a set of tab-separated TSV files) of all formally defined PDF objects (dictionaries, arrays and map objects) and their relationships beginning with the PDF file trailer using a simple text-based syntax and a sm ..read more

The latest PDF 2.0 standard (ISO 32000-2:2020) is now available at no cost. For additional reference, this page provides external links to all legacy Adobe PDF references and errata, as well as to the ISO 32000 family of standards. PDF Version Year Reference Documents ISO 32000-2:2020 (PDF 2.0) 2020 ISO 32000-2:2020 Document management — Portable document format — Part 2: PDF 2.0 Errata: Industry-based resolutions for issues against ISO 32000-2 ISO Technical Specification Extensions to PDF 2.0: ISO/TS 32001:2022 Document management — Portable Document Format — Extensions to Hash Algor ..read more

ISO/TS 32003 Document management — Portable Document Format — Adding support of AES-GCM in PDF 2.0 is a PDF 2.0 extension Technical Specification (TS) currently being drafted by ISO TC 171 SC 2 WG 8. It extends PDF 2.0 to add support for 256-bit AES-GCM encryption. The existing PDF AES-CBC encryption is unaffected ..read more

Document management — Portable Document Format — Extensions to Digital Signatures in ISO 32000-2 (PDF 2.0) ISO/TS 32002 is a Technical Specification that specifies how to extend PDF 2.0 (ISO 32000-2) by adding support for the following extensions to PDF digital signatures: use of the NIST P-curve family of elliptical curves for digital signatures; use of the Brainpool family of elliptical curves for digital signatures; use of Edwards Curve (EdDSA) Ed448 and Ed25519 families of elliptical curves for digital signatures. ISO TS 32002 is now available at no cost! As of April 5, 2023, this Techni ..read more

AFP stands for Advanced Function Presentation and is a coordinated set of document creation, viewing, archiving and printing hardware, software and services that widely used for high-speed variable-data transactional printing. ISO 18565 is the ISO standard that defines a subset of AFP for the archival and retrieval of AFP documents. ISO 22550 is the standard that defines how PDF single and multi-page documents can be carried in an object container in AFP to get the performance and management needed in high-speed print environments. While AFP has had the ability to include PDF data in object co ..read more