PDF standards
What is PDF/A?
PDF/A is the ISO-standardized PDF family for long-term preservation. The “A” refers to archiving. PDF/A constrains ordinary PDF so a conforming file is more self-contained and reproducible in the future.
Updated August 10, 2026
Quick answer
PDF/A is PDF with archival rules.
PDF/A is not a completely different file format. It is a standardized subset and profile of PDF defined by the ISO 19005 series for long-term preservation. A PDF/A file must meet specific requirements intended to reduce dependencies on external resources or features that could make future rendering unreliable.
Why does PDF/A exist?
Ordinary PDFs can depend on features that may not be ideal for preservation. Archival workflows care less about convenience today and more about whether the document can still be interpreted consistently many years from now. PDF/A establishes conformance requirements for that preservation goal.
PDF/A-1, PDF/A-2, PDF/A-3 and PDF/A-4
The PDF/A family has evolved alongside PDF itself. PDF/A-1 is based on PDF 1.4; PDF/A-2 and PDF/A-3 use ISO 32000-1 / PDF 1.7; PDF/A-4 is based on PDF 2.0 / ISO 32000-2. The versions are not simply quality levels — they support different generations and capabilities of PDF.
| Variant | Base PDF | High-level note |
|---|---|---|
| PDF/A-1 | PDF 1.4 | First PDF/A standard |
| PDF/A-2 | PDF 1.7 | Broader modern PDF capabilities |
| PDF/A-3 | PDF 1.7 | Allows embedded files under its rules |
| PDF/A-4 | PDF 2.0 | Current generation based on ISO 32000-2 |
Is every PDF suitable for archiving?
No. A file with a .pdf extension is not automatically PDF/A. Conformance has to be created and validated against a particular PDF/A specification. Institutions may also impose additional preservation requirements beyond PDF/A itself.
When should you use PDF/A?
PDF/A is relevant when long-term retention is a requirement: records management, government archives, legal or regulatory retention, libraries, research repositories and other preservation workflows. For ordinary short-lived sharing, a normal PDF may be entirely appropriate.
Important: eggPDF does not currently certify PDF/A
The current eggPDF tools merge, split, extract and rotate PDFs. They are not presented as PDF/A validators or archival-conformance tools. If a workflow requires PDF/A compliance, validate the final document with software designed for the exact PDF/A profile you need.
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