PDF Standards
Validate and convert documents to industry-standard PDF formats.
PDF Standard Types
PDF/A (Archival)
PDF/A is designed for long-term preservation of documents.
Use cases:
- Legal documents requiring permanent records
- Financial records and compliance archives
- Government document preservation
- Any document that must be readable in 10+ years
Key requirements:
- All fonts embedded
- No external dependencies (links, multimedia)
- Color management included
- Metadata preserved
PDF/X (Exchange)
PDF/X ensures reliable printing across different systems.
Use cases:
- Commercial printing
- Magazine and newspaper production
- Print advertising
- Any high-quality print output
Key requirements:
- All fonts embedded
- Colors in CMYK or spot colors
- Bleed and trim marks defined
- No transparency (or flattened)
PDF/UA (Universal Accessibility)
PDF/UA ensures documents work with assistive technologies.
Use cases:
- Public sector documents
- Educational materials
- Legal accessibility compliance
- Universal access requirements
Key requirements:
- Full document tagging
- Logical reading order
- Alternative text for images
- Proper heading structure
PDF/A Versions
| Version | Based On | Best For |
|---|---|---|
| PDF/A-1a | PDF 1.4 | Strict compliance, tagged |
| PDF/A-1b | PDF 1.4 | Visual preservation |
| PDF/A-2a | PDF 1.7 | Tagged, with layers/transparency |
| PDF/A-2b | PDF 1.7 | Visual preservation (recommended) |
| PDF/A-2u | PDF 1.7 | Unicode text preservation |
| PDF/A-3a | PDF 1.7 | With attachments, tagged |
| PDF/A-3b | PDF 1.7 | With attachments |
PDF/A-2b is recommended for most archival needs. It offers good compatibility while supporting modern PDF features.
PDF/X Versions
| Version | Color Space | Transparency | Use Case |
|---|---|---|---|
| PDF/X-1a | CMYK/Spot only | No | Traditional commercial print |
| PDF/X-3 | Any, with intent | No | Color-managed workflows |
| PDF/X-4 | Any, with intent | Yes (live) | Modern print production |
Validating Standards Compliance
Open Standards Checker
Click Tools → Standards → Validate
Select Standard
Choose the standard to validate against:
- PDF/A-1b, PDF/A-2b, PDF/A-3b
- PDF/X-1a, PDF/X-3, PDF/X-4
- PDF/UA
Run Validation
Click Validate to check compliance
Review Results
Issues are grouped by severity:
- Errors: Must fix for compliance
- Warnings: Recommended fixes
- Info: Suggestions
Converting to PDF/A
Open Your Document
Load the document you want to convert
Start Conversion
Click File → Save As PDF/A or Tools → Standards → Convert to PDF/A
Select Version
Choose PDF/A version:
- PDF/A-2b (recommended)
- PDF/A-1b (maximum compatibility)
- PDF/A-3b (with attachments)
Review Issues
Penvio shows what will be changed:
- Fonts that will be embedded
- Features that will be removed
- Color space conversions
Convert
Click Convert to create the PDF/A file
Verify
Run validation to confirm compliance
Converting to PDF/X
Prepare Your Document
- Convert colors to CMYK
- Set bleed areas if needed
- Remove or flatten transparency
Start Conversion
Click Tools → Standards → Convert to PDF/X
Select Version
Choose PDF/X version:
- PDF/X-4 (recommended for modern workflows)
- PDF/X-1a (maximum compatibility)
- PDF/X-3 (color-managed)
Set Output Intent
Select the output color profile:
- SWOP (US standard)
- FOGRA (European standard)
- Custom ICC profile
Convert and Verify
Convert and validate the result
Common Issues and Fixes
Font Issues
| Issue | Fix |
|---|---|
| Fonts not embedded | Embed all fonts |
| Non-embeddable font | Substitute with embeddable font |
| Subset too small | Embed full font |
Color Issues
| Issue | Fix |
|---|---|
| RGB colors in PDF/X-1a | Convert to CMYK |
| Missing color profile | Embed ICC profile |
| Device-dependent color | Add output intent |
Content Issues
| Issue | Fix |
|---|---|
| External links | Remove or internalize |
| JavaScript | Remove scripts |
| Multimedia | Remove audio/video |
| Transparency in PDF/X-1a | Flatten transparency |
Metadata Issues
| Issue | Fix |
|---|---|
| Missing XMP metadata | Add required metadata |
| Incorrect PDF version | Upgrade/downgrade version |
| Missing document ID | Generate document ID |
Auto-Fix Capabilities
Penvio can automatically fix many compliance issues:
- Run validation
- Click Auto-Fix for fixable issues
- Review what will be changed
- Apply fixes
- Re-validate
Auto-fix may change document appearance. Always review before finalizing.
Compliance Matrix
| Requirement | PDF/A | PDF/X | PDF/UA |
|---|---|---|---|
| Fonts embedded | Yes | Yes | Yes |
| Tagging required | A variants | No | Yes |
| JavaScript allowed | No | No | No |
| Encryption allowed | No | No | No |
| External links | No | No | Limited |
| Transparency | 2/3 only | X-4 only | Yes |
| Color profile | Embedded | Output intent | Embedded |
Best Practices
- Start clean: Begin with a well-structured source document
- Validate early: Check compliance before finalizing
- Use preflight: Run preflight checks before conversion
- Test output: Verify the converted file meets needs
- Keep originals: Save the original file before conversion
Tips
- PDF/A-2b is the best general-purpose archival format
- PDF/X-4 supports transparency, older versions don’t
- PDF/UA compliance requires accessible source documents
- Some features are mutually exclusive between standards
- Always validate after conversion to confirm compliance
Next Steps
- Preflight Checks - Inspect documents before converting to a standard
- Flatten Documents - Flatten transparency for PDF/X compliance
- Accessibility Checker - Validate PDF/UA accessibility requirements