What is PDF/A used for?

PDF/A is an ISO-standardized format for long-term archiving. It is required by many courts, government agencies, libraries, and records systems because it guarantees a document will display the same way decades from now.

What is the difference between PDF and PDF/A?

PDF/A is a restricted version of PDF: it embeds all fonts, forbids external dependencies, and bans features that may not render reliably over time (like JavaScript, encryption, and external links). A normal PDF allows those features.

Can I convert a regular PDF to PDF/A?

Yes. A conversion tool embeds the fonts and removes disallowed elements to produce a compliant, self-contained file.

Does PDF/A make the file bigger?

Often slightly, because all fonts must be embedded. The trade-off is a document guaranteed to be readable far into the future.

PDF Basics

PDF vs PDF/A: What's the Difference and When to Use Each

By The OptaPDF Team • Published June 8, 2026 • 5 min read

If you've ever been asked to submit a "PDF/A" file for a court filing, grant application, or records system and wondered how it differs from a normal PDF, here's the clear answer: PDF/A is the archival edition of PDF — designed so a document looks identical decades from now, on software that may not exist yet.

What PDF/A actually is

PDF/A ("A" for Archive) is an ISO standard (ISO 19005) — a stricter subset of the regular PDF format. It keeps everything that makes PDFs reliable and removes everything that makes them fragile over time.

The key differences

All fonts must be embedded. A normal PDF can rely on fonts installed on the reader's computer. If that font is missing in 2050, the document reflows or substitutes characters. PDF/A bundles every font inside the file, so it's fully self-contained.
No external dependencies. Links to external files, fonts, or color profiles are disallowed — nothing the document needs lives outside it.
No "risky" dynamic features. JavaScript, audio/video, and launch actions are banned because they may not run safely or consistently in the future.
No encryption. An archival document must be openable without a password forever, so encryption isn't permitted.
Standardized color. Color is described in a device-independent way so it looks consistent across screens and printers.

When you should use PDF/A

Reach for PDF/A whenever a document needs to survive unchanged for years:

Court and legal filings (many e-filing systems require it).
Government, tax, and regulatory submissions.
Academic theses and journal archives.
Long-term business records — contracts, invoices, compliance documents.

When a normal PDF is fine

For everyday sharing — sending a report, emailing a flyer, posting a manual — a standard PDF is perfect. You'd actively not want PDF/A if you need password protection (use Protect PDF) or interactive form features, since PDF/A strips those out.

How to convert to PDF/A

Open PDF to PDF/A and upload your document.
The tool embeds all fonts and removes disallowed elements to produce a compliant file.
Download your archival-ready PDF/A.

Tip: if your source is a scan, run OCR first. An archived document is far more valuable when its text is searchable, not just a picture.

In one sentence

Use a normal PDF to share today; use PDF/A to guarantee a document still opens and looks right decades from now.