PDF Association logo

Discover pdfa.org

Key resources

Get involved

How do you find the right PDF technology vendor?
Use the Solution Agent to ask the entire PDF communuity!
The PDF Association celebrates its members’ public statements
of support
for ISO-standardized PDF technology.

Member Area


ISO 19444

XML Forms Data Format — Part 1: Use of ISO 32000-2 (XFDF 3.0)

This standard specifies an XML format for representing forms data and annotations in PDF 2.0, as defined by ISO 32000-2. This document does not alter ISO 32000-2 in any way.

XFDF is the XML equivalent to FDF files, which are defined in clause 12.7.8 of ISO 32000-2. FDF files uses the same COS syntax that PDF files use.

XFDF was first published in 2016, with a 2019 dated revision making the following improvements:

  • Addition of 3D comment related elements and attributes;
  • Stream encoding information for XFDF.


Technical questions about ISO 19444-1 are most effectively addressed in the PDF Association’s official pdf-issues GitHub repo.


Buy ISO 19444

PDF Association members: login to pdfa.org before adding to cart for a 10% discount.

ISO 19444 specifies an XML format for representing forms data and annotations in ISO 32000-2 (PDF 2.0). It is the XML equivalent of FDF.

Subscribe here for the PDF Association’s periodic updates regarding new, updated, or corrected industry and ISO specifications for PDF technology.

PDF 2.0 icon

Community: PDF TWG

ISO Group Responsible: ISO TC171 SC2 WG8

ISO Status: status of all PDF-related ISO work

Errata: PDF 2.0 (ISO 32000-2)


WordPress Cookie Notice by Real Cookie Banner