PDF/A Archival Standard: How to Ensure Long-Term Preservation of Important Documents

Will the PDF documents you create today be readable in 20 or 50 years? Most people assume that PDFs are permanent. However, standard PDFs often depend on system fonts, external web links, audio scripts, and dynamic software dependencies that can render documents unreadable as technology evolves.

To solve digital obsolescence, the International Organization for Standardization created PDF/A (ISO 19005)—an ISO-standardized version of the Portable Document Format specialized for digital preservation.

What Makes PDF/A Different from Standard PDF?

PDF/A strictly forbids features that hinder long-term archiving, ensuring self-containment:

• Mandatory Font Embedding: All fonts must be 100% embedded inside the document. The PDF cannot rely on system fonts installed on future operating systems.
• No Audio or Video Content: Multimedia elements that rely on external codecs are prohibited.
• No JavaScript or Executable Code: Dynamic scripts that change content dynamically or introduce security vulnerabilities are strictly banned.
• Device-Independent Color Profiles: Colors must be specified using device-independent color spaces (such as ICC profiles) to ensure exact visual reproduction on future monitors and printers.

When Should You Use PDF/A?

PDF/A is required for government filings, legal deeds, academic dissertations, patent applications, and financial audits. By ensuring your documents conform to PDF/A standards, you prevent future data corruption and software incompatibility.

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