Docly practical guide
PDF/A Explained and How to Convert a PDF for Archiving
A document that renders correctly today will not necessarily render correctly in ten years. Fonts get removed from systems, colour profiles go missing, and external dependencies stop resolving. PDF/A is the archiving profile designed to remove those risks.
PDF/A versus a regular PDF
PDF/A is a valid PDF, not a separate file type. It is a restricted profile whose core rule is that everything needed to display the document must live inside the file itself. Fonts are embedded and colour information is attached to the document.
As a result, PDF/A files contain no calls to external fonts, no JavaScript, no embedded audio or video and no encryption. The restrictions make the file less flexible but far more predictable, which is exactly the trade you want for long-term storage.
Convert a PDF to PDF/A
Add your file to the PDF/A tool and start the conversion. The document is converted to PDF/A-2b, the common archival level for text and appearance fidelity. Because the page structure has to be rewritten, it takes longer than most conversions.
Encrypted files cannot be converted, since the standard does not permit encryption. Remove the protection with PDF Unlock first. For scanned archives, running PDF OCR before conversion makes the archived document searchable, which is usually the difference between an archive people use and one they cannot.
What changes during conversion
Colours are converted to RGB. That goes unnoticed in documents read on screen, but CMYK files prepared for commercial printing can shift in tone, so think twice before converting press-ready artwork. Fonts that were not embedded are embedded or substituted.
When an element cannot be converted, the process continues rather than aborting. That guarantees you get a usable output, but it does not guarantee full compliance. If you are depositing into an institutional archive, expect to run the result through a dedicated PDF/A validator as well.
When PDF/A is required
Institutional archives, government submission portals, legal and notarial processes, thesis deposits and long-lived contracts, invoices and technical documentation are the usual cases. Everyday sharing and short-lived attachments do not need it.
If an organisation asks for PDF/A, check which version their specification expects, because 1b, 2b and 3b follow different rules. Also expect the file to grow: embedding fonts and colour data inside the document adds size compared with the original.
Quick checklist
- ✓Convert only once the document is final; later edits can break compliance.
- ✓Unlock password-protected files before converting.
- ✓Run OCR on scans first so the archive stays searchable.
- ✓Confirm which PDF/A version the recipient requires.
Tools in this guide
Frequently asked questions
Does a PDF/A file open in normal readers?
Yes. PDF/A is a valid PDF and opens in any common reader.
Can a PDF/A file be password protected?
The standard does not allow encryption. Create a separate copy and encrypt that if you need password-protected sharing.
Why did the file get bigger?
Fonts and colour information are now embedded in the document itself, which adds size.