PDF/A Explained: How to Archive PDFs for the Long Term

Most people assume any PDF will simply open forever, but a standard PDF can technically rely on things like external fonts, embedded video, encryption, or JavaScript that may not be supported the same way by future software. PDF/A exists specifically to solve that long-term reliability problem.

What makes PDF/A different

PDF/A is a stricter subset of the regular PDF format, specifically designed for long-term archiving. It requires all fonts to be embedded directly in the file (so nothing depends on fonts being installed on a future device), disallows JavaScript and external content links, and disallows encryption, all specifically to guarantee the document will render identically decades from now.

Who actually needs PDF/A

Everyday documents, like a resume or an invoice you're sending this week, don't need PDF/A. It matters for legal records, government filings, medical records, and institutional archives, anything that must remain readable and unchanged for years or decades and may be subject to compliance requirements.

Converting an existing PDF to PDF/A

Most PDF/A conversion tools will check your file for anything that violates the PDF/A standard, like missing embedded fonts or JavaScript, and either fix it automatically or flag it for you to address manually before the conversion can complete.

A common misconception

PDF/A is not a different-looking file or a special reader, a PDF/A file opens and displays exactly like a normal PDF in any standard PDF viewer, the difference is entirely in what's technically permitted inside the file to guarantee long-term compatibility.