What Is PDF/A and When You Need It

What does PDF/A mean?

The Library of Congress describes PDF/A as a family of ISO standards for constrained forms of PDF intended to be suitable for long-term preservation of page-oriented documents. Its primary purpose is to preserve a document’s static visual appearance over time, independent of the tools and systems used to create, store or render it. To do that, it aims for device independence, self-containment and self-documentation.

In other words, PDF/A is still a PDF. It opens in normal PDF readers. The difference is what it is not allowed to contain.

What does PDF/A forbid or require?

For PDF/A-1, PDF/A-2 and PDF/A-3, the Library of Congress lists these constraints: no audio or video; no 3D artwork; no JavaScript or executable file launches; all fonts embedded and legally embeddable; colour spaces specified in a device-independent way; no encryption; and standards-based metadata required.

The no-encryption rule surprises people. A password-protected PDF cannot be PDF/A, so if a portal asks for PDF/A, do not lock the file.

What are PDF/A-1, -2, -3 and -4?

PDF/A-1 (ISO 19005-1:2005) is based on PDF 1.4. PDF/A-2 (ISO 19005-2:2011) is based on PDF 1.7 and allows embedding PDF/A-compliant attachments. PDF/A-3 adds one major feature: embedding files in any format. PDF/A-4 is based on PDF 2.0, drops the A, B and U levels and introduces profiles, including PDF/A-4f for embedded files and PDF/A-4e for engineering documents.

If a requirement just says PDF/A without a version, ask which one is accepted. Many systems name a specific part, such as PDF/A-1b or PDF/A-2b.

What do the letters A, B and U mean?

In PDF/A-1, -2 and -3, conformance level A satisfies all requirements of the standard. Levels B and U are lower: they still guarantee visual appearance but are less demanding about structural or semantic properties. The Library of Congress notes that level B is the level typically used for PDF/A files created from scanned pages.

The PDF Association uses the names Accessible, Basic and Unicode for these levels. Level A is not the same as the separate accessibility standard PDF/UA, so an A-level file is not automatically fully accessible.

How can I tell whether a PDF is PDF/A?

Real conformance needs a validator, which tests the file against the standard. Without one, you can look for clues. Open the file in the PDF Metadata tool to see Title, Author, Subject, Keywords, Creator, Producer and dates. The Producer often names the program that wrote the file and some converters mention PDF/A there, but that is a clue, not proof.

Many desktop PDF readers show a banner when a file claims PDF/A conformance. If your workflow requires it, create the file with software that has an explicit PDF/A export or save option and validate the result.

Why do archives and courts ask for PDF/A?

Record keepers have to open documents decades after they were created, on software that does not exist yet. A file that relies on a font installed on one office computer, on a script, or on a password that someone has forgotten may become unreadable or display differently. PDF/A’s rules remove those dependencies, so the file carries everything needed to show each page.

That is also why PDF/A is mainly about appearance. It guarantees that pages look the same when opened later; it does not by itself make text searchable or make a document accessible to screen readers.

Does PDF/A have downsides?

Files can be larger, because every font used must be embedded instead of relying on fonts installed on the reader’s computer. Some features are not available, such as encryption, embedded video and, before PDF/A-4, JavaScript, so interactive forms and protected documents need a different approach.

For everyday sharing, an ordinary PDF is usually fine. Choose PDF/A when the document is a record that must be kept, or when a recipient explicitly requires it.

Why does metadata matter for PDF/A?

PDF/A requires standards-based metadata, so a file describes itself: what it is, who made it and with which tool. Fields such as Title and Author help archives catalogue documents, and Producer records the software that wrote the file. Use the PDF Metadata tool to read these fields and correct obvious problems, such as an empty Title or a leftover author name, in the original document before exporting to PDF/A again.

Can a scanned document be PDF/A?

Yes. A scan saved as PDF/A keeps each page as an image inside a file that follows the archival rules, and the Library of Congress notes that level B is the level typically used for PDF/A files made from scanned pages. Adding OCR text is possible in some software but is a separate step; without it, the archival copy looks right but cannot be searched.

If you are building a scanned PDF yourself in the browser, the result is an ordinary PDF. Convert it to PDF/A with software that offers that option when an archive needs it.

How do I prepare a PDF/A file step by step?

1. Confirm the version. Ask the archive, court or portal which PDF/A part and level it accepts.
2. Export from the source. In your word processor or scanner software, choose a PDF/A save or export option.
3. Avoid forbidden features. Do not add passwords, video, audio or scripts.
4. Inspect metadata. Open the file in the PDF Metadata tool to check the Title, Author, Creator and Producer fields.
5. Validate. Run the file through a PDF/A validator if the submission requires proof of conformance.

Example

What should I keep in mind?

FAQ

What is the difference between PDF and PDF/A?

PDF/A is a restricted form of PDF for long-term preservation. It bans features such as encryption, JavaScript and audio, and requires embedded fonts.

Which ISO standard defines PDF/A?

ISO 19005, published in several parts for PDF/A-1, -2, -3 and -4.

Can a PDF/A file have a password?

No. Encryption is not allowed in PDF/A.

What does the b in PDF/A-1b mean?

Level B, a basic conformance level that guarantees visual appearance. It is common for scanned pages.

Is PDF/A-3 different from PDF/A-2?

PDF/A-3 adds the ability to embed files of any format.

Is PDF/A the same as an accessible PDF?

No. Level A is not the same as PDF/UA, the accessibility standard.

Can I open a PDF/A file in a normal PDF reader?

Yes. PDF/A files are PDFs and open in standard readers.

Does the PDF Metadata tool check PDF/A compliance?

No. It shows document fields like Producer, which can be a clue, but it is not a validator.

Should I remove metadata from a PDF/A file?

Usually not, because PDF/A requires standards-based metadata.

When do I need PDF/A?

When an archive, court, records system or employer requires it for long-term storage.

Do courts always require PDF/A filings?

Many prefer or mandate PDF/A, but rules vary—check the clerk’s technical standards before filing.

Can fonts be missing in a valid PDF/A?

No—needed fonts must be embedded so the file renders the same years later.

Is PDF/A good for interactive forms?

Basic archival levels restrict some interactivity; confirm the level your archive allows.

How does PDF/A relate to long-term digital preservation?

It constrains features that break over time, favoring self-contained, predictable documents.

Can I convert an existing PDF to PDF/A easily?

Converters exist, but failures happen when fonts, encryption, or media violate the profile.

Does color management matter for PDF/A?

Yes—profiles and output intents help keep colors reproducible in archival viewers.

Should marketing flyers be saved as PDF/A?

Usually unnecessary—use PDF/A for records retention, not everyday promotional PDFs.

What happens if JavaScript is present?

Most PDF/A levels disallow or strip active JavaScript because it is not archival-safe.

Is PDF/A-4 aimed at newer PDF versions?

PDF/A-4 aligns with newer PDF editions; pick the level your repository documents support.

Can scanned images alone satisfy PDF/A?

Image-only scans can, if the file meets embedding and metadata rules for the chosen level.

Sources and further reading

• PDF/A Family, PDF for Long-term Preservation (Library of Congress)