Archiving PDFs So They Still Open in Ten Years
Assuming that a file which opens today will open in ten years feels reasonable. With digital documents that assumption often turns out wrong — and by the time anyone notices, it is usually too late.
What degrades over time
- Missing fonts: If a non-embedded font cannot be found, the text is drawn in another face and the layout shifts.
- External dependencies: Images or fonts linked from elsewhere eventually disappear.
- Encryption: A document whose password is forgotten cannot be recovered.
- Interactive content: Embedded scripts and multimedia stop working in future readers.
- Bit rot: Storage media degrade; a single copy is not an archive.
What PDF/A is
PDF/A is a subset of PDF defined for long-term preservation. The idea is simple: everything needed to display the document correctly must be inside the file, with no external dependency left.
| Feature | Ordinary PDF | PDF/A |
|---|---|---|
| Font embedding | Optional | Required |
| Encryption | Allowed | Forbidden |
| JavaScript | Allowed | Forbidden |
| Externally linked content | Allowed | Forbidden |
| Colour profile | Optional | Must be defined |
| Audio and video | Allowed | Forbidden |
Forbidding encryption looks odd at first. The reasoning: a document whose password is lost is not archived. Confidentiality in an archive belongs to access control, not to the file itself.
Three decisions when building an archive
- Keep the source too. A PDF is output; the Word or design file is the editable source. Store both.
- Standardise naming. A scheme like
2026-09-08_contract_client-name_v2.pdfis the only realistic way to find a file ten years later. - Make it searchable. Run scans through OCR; an archive you cannot search is, in practice, an archive you have lost.
Decisions you cannot undo
Some archive operations are one-way, and regret does not help:
- Over-compression: Lost resolution does not come back. Keep the archive copy at full resolution and produce a separate sharing copy.
- Deleting the original: After processing a scan, keep the raw capture for a while.
- Adding a password: Lose the archive password and you have lost the document.
- A single copy: A file sitting in one place is not backed up.
A practical minimum
Even without a formal archiving system, three habits noticeably extend the life of your documents: make sure fonts are embedded, run scans through OCR, and keep a second copy on different media.
Merging related documents into one PDF per topic also simplifies an archive: ten files instead of a hundred are easier both to back up and to find.
Frequently asked questions
Is PDF/A better than ordinary PDF?
Not better, just constrained for a different purpose. It requires everything needed to display the document correctly to be inside the file. For everyday sharing, ordinary PDF is entirely appropriate.
Why does PDF/A forbid encryption?
A document whose password is lost is not archived. Confidentiality in an archive belongs to access control, not to the file itself.
What is the most common archiving mistake?
Keeping a single copy and deleting the original. A file sitting in one place is not backed up, and the raw scan is worth keeping for a while after processing.
How should I name archived files?
With a consistent scheme, date first, subject and version after. Standardising the naming from the start is the only realistic way to find a file ten years later.
More guides
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