What Is PDF/A, and Why Do Archives Require It?
Guide · PDF Tools
A regular PDF can reference things outside itself — a linked font that isn't embedded in the file, JavaScript, encryption, external media — any of which can make the file behave differently, or fail to open correctly, on a computer decades in the future once that external dependency no longer exists or the software that reads it is gone. PDF/A exists specifically to prevent that.
What PDF/A actually restricts
The PDF/A standard requires every font used in the document to be embedded directly inside the file (so it doesn't rely on that font being installed on whatever computer opens it later), disallows JavaScript and other executable content, and disallows encryption. The goal is a file that's fully self-contained and will render identically on any compliant reader, indefinitely, regardless of what software or fonts exist at the time.
Why courts, libraries, and government agencies require it
Legal filings, academic archives, and government records need to remain readable for decades — sometimes permanently — and a regular PDF that depends on a specific font being installed, or contains active content that later becomes a security liability, isn't a safe long-term archival format. PDF/A trades some flexibility for that long-term reliability guarantee.
Converting an existing PDF to PDF/A
Converting embeds all fonts, strips out disallowed elements like JavaScript, and validates the result against the PDF/A specification. If your original PDF relies heavily on external fonts or interactive form scripting, expect the conversion to change how certain elements behave, since those unsupported features get removed rather than silently kept.
Check before you submit
If an institution specifically requires PDF/A, submitting a regular PDF (even one that looks fine when you open it) can get a filing rejected outright — the format requirement is usually a hard technical check, not a suggestion. Convert and verify compliance before submission rather than after a rejection notice.