PDF/A (Archival PDF)
PDF/A is an ISO-standardized version of PDF designed for long-term archival preservation. It ensures a document will look the same decades from now.
Why PDF/A exists
A regular PDF can reference external resources — fonts, images, JavaScript, video — that may not be available 20 years from now. PDF/A solves this by embedding everything needed to reproduce the document exactly: fonts, color profiles, and metadata are all self-contained.
PDF/A versions
- PDF/A-1 (2005) — Based on PDF 1.4. Two conformance levels: A (accessible) and B (basic). No transparency, no layers, no attachments.
- PDF/A-2 (2011) — Based on PDF 1.7. Adds JPEG2000, transparency, layers, and embedded PDF attachments.
- PDF/A-3 (2012) — Same as A-2 but allows embedded files of any type (useful for invoices with XML data).
- PDF/A-4 (2020) — Based on PDF 2.0. Simplified conformance levels, better support for modern PDF features.
When to use PDF/A
- Legal archives — court filings, contracts, evidence
- Government documents — laws, regulations, official records
- Medical records — patient histories required for 10+ years
- Financial records — audit trails, tax documents
- Academic papers — theses, journal articles, institutional repositories
- Any document you need to open in 2040
PDF/A limitations
Because PDF/A embeds everything, files are typically larger than regular PDFs. The format also prohibits certain interactive features like JavaScript, audio/video, form actions, and encryption. If you need these, use a regular PDF for daily work and convert to PDF/A only for archiving.
How to create PDF/A
Most PDF tools, including Microsoft Word, Adobe Acrobat, and LibreOffice, can export to PDF/A. When saving, choose PDF/A-1b for maximum compatibility or PDF/A-2b for modern features. Validators like veraPDF can check whether a file actually conforms to the standard.
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