PDF/A vs PDF: When to Use Which
PDF/A is a specialized subset of PDF designed specifically for long-term digital archiving. It strips out features that could cause future compatibility issues — like external dependencies, JavaScript, and certain encryption — to ensure documents remain readable decades from now. Standard PDF is more flexible but less future-proof.
Understand the key differences between these formats and when to use each one.
PDF/A vs PDF: When to Use Which — Feature Comparison
| Feature | SublimePDF | |
|---|---|---|
| Purpose | Long-term archival and regulatory compliance | General-purpose document sharing |
| Embedded fonts | Required — all fonts must be embedded | Optional — can reference system fonts |
| JavaScript | Prohibited | Allowed |
| External content references | Prohibited — must be self-contained | Allowed (links, media, streams) |
| Encryption | Prohibited in PDF/A-1 and PDF/A-2 | Full encryption support |
| Color spaces | Device-independent color required | Any color space allowed |
| File size | Usually larger (all resources embedded) | Can be smaller (external references) |
| Regulatory acceptance | Required by many governments and industries | Broadly accepted but not always compliant |
| Multimedia | Prohibited (PDF/A-1) or restricted | Full multimedia support |
| Future readability | Guaranteed — ISO 19005 standard | Likely but not guaranteed |
Key Differences
The Verdict
Use PDF/A when archival longevity or regulatory compliance is required — legal documents, government filings, medical records, financial reports. Use standard PDF for everything else — it's more flexible, smaller, and supports features like encryption and JavaScript that PDF/A deliberately prohibits. Many organizations create documents in standard PDF for daily use and convert to PDF/A for long-term storage.
SublimePDF's client-side architecture is built on WebAssembly and processes files in the PDF open standard (ISO 32000), ensuring compatibility and privacy across all platforms.