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Convert June 2, 2026 7 min read

PDF/A vs Regular PDF: What's the Difference and When Do You Need It?

PDF/A is required by courts, libraries, and government archives — but most people don't know what it actually is. Here's the plain-English breakdown.

PDF/A vs Regular PDF: What's the Difference and When Do You Need It?

If you've ever submitted a court filing, applied to graduate school, or uploaded a document to a government portal, you may have seen a requirement that confused you: "document must be PDF/A." Your regular PDF was rejected, and now you're stuck wondering what the difference is. This article explains what PDF/A actually means, why it exists, and how to convert a regular PDF to PDF/A — all in plain language.

A regular PDF is a contract between you and the future

Every PDF is a promise that the document will look the same anywhere — on Windows or Mac, on a phone or a giant monitor, in 2026 or 2046. The PDF format succeeds at this most of the time. But "most of the time" isn't good enough for some use cases.

Imagine you submit a court filing today. In 25 years, a lawyer needs to open that filing as evidence in a related case. The fonts you used might no longer exist on standard systems. The software that displayed the PDF might be discontinued. Maybe the file was encrypted with a password no one remembers. Maybe there was an embedded JavaScript that used to do something but now does nothing. The document is technically still a PDF, but no one can open it the way you intended.

This is the problem PDF/A solves.

PDF/A is PDF, but with rules

PDF/A — "A" for archival — is a strict subset of the PDF specification, formalized as ISO 19005. Every PDF/A file is a valid PDF, but not every PDF is a valid PDF/A. The rules exist to guarantee that the document will display identically far into the future, regardless of how technology changes.

The main requirements:

All fonts must be embedded. Regular PDFs can reference fonts by name and assume the viewer has them installed. PDF/A files must bundle every font they use. If the font Helvetica disappears from the world tomorrow, your PDF/A still renders perfectly because Helvetica is inside the file.

No encryption. A password-protected PDF works fine today, but if no one remembers the password 30 years from now, the file is unrecoverable. PDF/A forbids encryption — the document must always be openable.

No JavaScript or multimedia. PDFs can contain interactive scripts, embedded videos, and audio clips. None of that is allowed in PDF/A. The reason: those features depend on plugins and runtimes that may not exist in the future. A PDF/A document must work as static, paginated text and images.

The version letters: 1, 2, 3 and a, b, u

You may have seen labels like PDF/A-1b, PDF/A-2b, or PDF/A-3u. They're not random:

  • The number (1, 2, 3) is the PDF/A specification revision. Higher numbers allow more features.
  • The letter (a, b, u) is the conformance level. A ("accessibility") includes tagged structure for screen readers. B ("basic") just guarantees visual reproducibility. U ("unicode") additionally requires proper text encoding.

For most submissions, PDF/A-2b is the right target. It's accepted by virtually every archival system.

When do you actually need PDF/A?

If no one is asking you for it, you probably don't need it. The use cases where it's required:

  • Court filings in many US courts
  • Patent and trademark applications
  • Theses and dissertations at most universities
  • Long-term corporate records (7+ years)
  • Government document submissions
  • Historical and library archives

If you're sharing a contract with a client or sending a report to a colleague, regular PDF is fine.

How to convert a regular PDF to PDF/A

Use SwitchPDF's PDF to PDF/A converter — it runs Ghostscript, the industry-standard tool. Upload, click Convert, download. Takes a few seconds.

After conversion, validate the output with veraPDF (free, open-source) to confirm it passes the PDF/A profile checks.

The bottom line

PDF/A is a stricter version of PDF designed for long-term archival. Use regular PDF for daily work. Convert to PDF/A only when an archival system specifically requires it.

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