PDFStack Tool
PDF to PDF/A — Archival PDF Conversion Free
Convert standard PDFs to PDF/A — the ISO 19005 standard for long-term digital archiving. PDFStack re-serializes your PDF with object stream optimization for improved archival compatibility, suitable for regulated industries and document management systems.
Open PDF to PDF/A →
No file uploads
No account required
Free to use
Private & secure
What is PDF/A and who needs it?
PDF/A is a subset of PDF specifically designed for archiving. It self-contains all fonts, colour profiles, and metadata — ensuring the document renders identically decades from now without external dependencies. Law firms, government agencies, and financial institutions commonly require PDF/A for records.
How to convert PDF to PDF/A
- 1Open PDF to PDF/A in PDFStack.
- 2Upload your PDF.
- 3Click Convert to PDF/A.
- 4Download the re-serialized archival PDF.
All processing happens locally in your browser — no files are uploaded to any server.
Common Uses
Submitting documents to court systems, archiving financial records, storing legal contracts, meeting regulatory document retention requirements.
Frequently Asked Questions
Which PDF/A level does PDFStack produce?
PDFStack applies pdf-lib re-serialization for improved archival compatibility. For strict PDF/A-1b or PDF/A-2b certification with validator-passing output, use Acrobat Pro or a certified server-side tool.
Why do I need PDF/A instead of regular PDF?
PDF/A is self-contained and guaranteed to render consistently without external fonts, DRM, or JavaScript — essential for long-term archives.
Is my PDF private?
Yes. Conversion is entirely client-side.
Is there a file size limit?
No server limit applies.