PDF/X Is Moving: What the ISO Changes Mean for Printers

Most printers never think about where PDF/X comes from. It is simply the standard behind "print-ready PDF" and the foundation of the Ghent Workgroup specifications, which we explain in GWG 2022 and PDF/X explained. But in 2025 something changed behind the scenes that will shape the next generation of print PDFs, and callas CEO Dietrich von Seggern, who is closely involved in standards work, has written about why it matters.

What changed

Two ISO committees are involved. ISO TC 171 is responsible for PDF itself and for subsets such as PDF/A for archiving and PDF/UA for accessibility. ISO TC 130, the graphic technology committee, has historically looked after the print-specific subsets, PDF/X and PDF/VT.

In ballots that closed in May 2025, both committees agreed to move PDF/X out of TC 130 and into a new joint working group within TC 171. PDF/VT, for variable data, stayed where it was because there is currently no active work on it.

Why it matters

The aim is to bring PDF/X closer to PDF itself. In practice that means the print standard and the core PDF standard can evolve together rather than separately. One immediate benefit is alignment work between PDF/A-4 and PDF/X-6, the PDF 2.0 based versions of the archiving and print standards, with new versions of both in development.

It may also change who has a say. The PDF Association runs the secretariat for TC 171, and von Seggern suggests it could become a larger forum for graphic arts requirements, giving vendors, printers and other members a route into standards discussions.

What is on the agenda for print

Von Seggern highlights three topics that affect the graphic arts:

• Extended gamut spot colours. PDF/X-5n and PDF/X-6n allow colour spaces such as CMYKOVG, but PDF 2.0 cannot yet blend these spot colours with transparency without converting them to CMYK. For packaging and label printers using extended gamut, that is a practical limitation.
• HDR graphics. High dynamic range images are becoming common on screens. There needs to be a way to encode them in PDF and rules for how they print on office, offset and multi-colour digital presses. He is openly sceptical about how well they can be printed.
• Content authenticity. C2PA provenance data, which records how a file was created, needs to be specified properly for PDF. This is already a live issue: ChatGPT-generated PDFs carrying Content Credentials have been causing PDF/X problems, as we describe in AI in prepress.

What printers should do now

Nothing changes overnight. As von Seggern notes, the industry adopts standards more slowly than they are developed, and that is not a problem until the industry needs something that does not exist yet. For most commercial printers, PDF/X-4 with a suitable GWG profile remains the sensible baseline today.

What is worth doing:

1. Keep your preflight tools current. Tools like callas pdfToolbox and Enfocus PitStop are where new standards and new file problems are handled first.
2. Watch PDF/X-6 if you work in packaging or extended gamut. That is where the most relevant changes are likely to land.
3. Decide how you handle provenance data. Content Credentials will become more common, and you may need to keep them for some customers.
4. Get involved if it matters to your business. Industry bodies such as the Ghent Workgroup and the PDF Association are where print requirements get heard.

If you want to check whether your preflight setup is ready for what is coming, get in touch.

Source: There is more difference between 171 and 130 than 41: recent ISO changes and what they mean (callas).