When working with important documents, you’ve probably encountered both PDF and PDF/A formats. While they look identical when opened, they serve fundamentally different purposes. Understanding the distinction is crucial for legal compliance, archival purposes, and long-term document preservation.
Core Purpose: Universal Viewing vs. Long-Term Preservation
Standard PDF was designed for document viewing and sharing. Its primary goal is to ensure a document looks exactly the same on any device, operating system, or software. This makes it perfect for everyday use—contracts, reports, presentations, and manuals.
PDF/A (the “A” stands for Archival) was created specifically for long-term preservation. Its purpose is to ensure a document remains readable and looks identical decades or even centuries from now, regardless of technological changes.
Technical Deep Dive: Key Differences That Matter
Font Embedding Requirements
Standard PDF: Can use system fonts or reference external fonts. If the recipient doesn’t have the same font installed, the PDF viewer may substitute a different font.
PDF/A: All fonts must be embedded within the PDF file itself. This guarantees the document will render exactly as intended, even if the font becomes obsolete.
Color Space Restrictions
Standard PDF: Can use device-dependent color spaces (like RGB for screens, CMYK for print).
PDF/A: Requires device-independent color spaces (like sRGB, grayscale, or CMYK with specific profiles). This ensures colors remain consistent across different output devices over time.
Encryption and JavaScript
Standard PDF: Can include password protection, encryption, and JavaScript for interactive features.
PDF/A: No encryption or JavaScript allowed. Security features that could prevent future access are prohibited.
Embedded Content and Multimedia
Standard PDF: Can embed audio, video, 3D objects, and executable files.
PDF/A: No embedded executable files or content requiring external plugins. PDF/A-3 allows embedding other files, but they’re not considered part of the archival document.
Metadata Requirements
Standard PDF: Metadata is optional and can be incomplete.
PDF/A: Requires specific metadata fields (title, author, creation date) in XMP format for proper identification and cataloging.
Decision Flowchart: When to Use Standard PDF, When to Use PDF/A
Use Standard PDF When:
- Sending documents for immediate review or signature
- Creating interactive forms with calculations
- Including multimedia content (videos, audio)
- Needing password protection for sensitive information
- Creating marketing materials with special effects
- Everyday business documents not requiring long-term preservation
Use PDF/A When:
- Legal or court documents with retention requirements
- Government records and public archives
- Academic theses and dissertations
- Medical records with legal retention periods
- Technical documentation that must remain accessible
- Any document requiring guaranteed readability in 10+ years
Real-World Scenarios
Scenario 1: Legal Contract
Initial Draft & Negotiation: Standard PDF (for easy sharing and commenting)
Final Signed Version: PDF/A-2 (for archival and legal compliance)
Why: The final contract must remain exactly as signed for the duration specified by law (often 7+ years).
Scenario 2: Academic Research Paper
Working Draft: Standard PDF or Word document
Published Version: PDF/A-1
Why: Academic libraries require PDF/A for long-term preservation of scholarly work.
Scenario 3: Marketing Brochure
Always: Standard PDF
Why: Contains interactive elements, special fonts, and is designed for immediate consumption, not long-term preservation.
How to Convert Between the Formats
Converting Standard PDF to PDF/A
You have several options:
- Adobe Acrobat Pro: Use “Save As Other” → “PDF/A”
- Online Conversion Tools: Many free tools can convert PDF to PDF/A
- Specialized Software: Tools like PDF Creator or LibreOffice can export directly to PDF/A
Important: Always verify the conversion using a PDF/A validator to ensure compliance.
Converting PDF/A to Standard PDF
This is generally not recommended as it removes the archival guarantees. However, if needed:
- Open the PDF/A in any PDF editor
- Save as standard PDF
- Note that you may need to re-add any interactive features that were stripped
Common Conversion Challenges and Solutions
Challenge 1: Font Licensing Issues
Some fonts prohibit embedding. Solution: Use free, open-source fonts or convert text to outlines.
Challenge 2: Color Space Conflicts
Professional design software may use specialized color profiles. Solution: Convert to sRGB before creating PDF/A.
Challenge 3: Interactive Elements
Forms and buttons get stripped. Solution: Preserve interactive versions separately from archival versions.
Future-Proofing Your Documents
For critical documents, consider this workflow:
- Create in your preferred software
- Save as standard PDF for immediate use
- Archive as PDF/A for long-term preservation
- Store both versions with clear naming conventions
- Validate PDF/A files periodically (every 5 years)
Remember: The best time to create a PDF/A is when you first finalize the document, not years later when formats may have changed.
Need to convert your documents? Our PDF to PDF/A converter makes it simple to create archival-quality documents. For documents that need editing before conversion, try our PDF editor first.
What conversion actually changes
Because a PDF/A file opens in any reader and looks identical to the original, it is easy to assume nothing happened. Something did, and it is readable in the file’s own bytes.
Putting a retention schedule through PDF to PDF/A at level 2B, the converted file carried a pdfaid identifier recording part 2, conformance B — absent from the original — and no encryption dictionary. The identifier is how a future reader, or an auditor, knows the file claims conformance at all.
Size moved too, from 47 KB to 40 KB. Conversion embeds every font the document needs rather than assuming the opening machine has it, and rewrites the rest of the structure, so the result can land either side of the original. Embedding is the whole point: a file that merely names a font is relying on a computer that may not exist in twenty years.
Why the standard forbids encryption
PDF/A does not permit encryption, and that surprises people who assume archival and secure belong together. The reasoning is straightforward once stated: an archival format has to be openable indefinitely by anyone with a legitimate claim, and a password is exactly the kind of thing that gets lost with the person who set it. A file nobody can open is not preserved.
In practice this means a protected document has to be unlocked before it can be archived — run Unlock PDF with the password first, then convert. Access control for the archive belongs to the system holding it, not to each individual file.
The same logic rules out anything else that could stop a file rendering on its own: external font references, audio and video, JavaScript, and transparency in the oldest conformance levels.
Choosing a part and a level
The part is which revision of the standard applies — 1 is the oldest and strictest, 2 adds JPEG 2000 and transparency, 3 additionally allows arbitrary attached files. The level is how much structural information is preserved: B for basic, which guarantees the page will look the same, and A for accessible, which additionally requires tagging, reading order and language so assistive technology can work with it.
Unless a regulator or an archive has named a level, 2B is the usual choice: modern enough not to fight your source file, and B because conformance level A requires genuine structural tagging that conversion cannot invent from a page that never had it.
Lastly, be clear about what the standard does not promise. PDF/A says the file will render the same way in future. It does not say the content is true, that it was not altered before conversion, or that it was signed by anyone. Those are separate questions, answered by the records system around the file.
