Ordinary PDFs can depend on things outside the file: fonts on the reader's computer, device-dependent colors, or features future software may not support. PDF/A is the ISO standard for archival PDFs that removes those dependencies. PDF to PDF/A rewrites your document as a PDF/A-2 file with an embedded sRGB color profile, for records that must stay readable long after today's software has changed.
By VelloDoc · Editorial policy
What PDF/A changes
PDF/A requires everything needed to display the document to be inside the file.
- What Ghostscript rewrites: VelloDoc uses Ghostscript to rewrite the document by the PDF/A-2 rules. Fonts are embedded and all colors are converted to the built-in sRGB color profile, so print (CMYK) colors can shift slightly. Smooth gradients may be stored as high-resolution images, and images can be recompressed, sometimes with lossy JPEG compression.
- What can't be carried over: Features the standard doesn't allow, like JavaScript and encryption, can't be carried over.
- Self-contained, same content: The pages keep their content and layout, and the file becomes self-contained.
- Compare the result: Documents with print colors, gradients, transparency or unusual fonts may change subtly, so compare the result with the original.
Validation and compliance
- No converter can promise compliance: Conversion follows the PDF/A-2 rules, but no converter can promise that every input will pass strict validation, because some source files contain constructs that can't be repaired automatically.
- When compliance is mandatory, as for court filings, government archives or regulated records, check the output with a dedicated validator like veraPDF and keep its report.
- If the server lacks Ghostscript: VelloDoc tells you plainly when a server lacks Ghostscript or the color profile that conversion needs.
Preparing documents for the archive
Archival copies are only useful if they're complete and findable.
- Repair, then make searchable: Fix damaged files with Repair PDF first, make scans searchable with OCR PDF, and set a meaningful title and author with View / Edit Metadata.
- Protected files can be converted after entering their password, but the PDF/A copy is saved without encryption.
- Where to read more: The format guide explains when PDF/A is worth using.
When people use PDF to PDF/A
Records retention
Store contracts, invoices and HR records in a format designed to remain readable for the full retention period.
Court and government filings
Prepare documents for systems that require PDF/A, then validate them before submission.
Digital preservation
Convert theses, reports and historical documents for libraries and archives that preserve them long term.
Limitations to know
PDF to PDF/A requires Ghostscript and an sRGB profile on the server. It targets PDF/A-2 without guaranteeing that every input validates, removes encryption and other forbidden features, converts all colors to sRGB, can store gradients as images and recompress images, and can subtly change transparency or unusual fonts. Validate when compliance is mandatory.
PDF to PDF/A: common questions
Which PDF/A version is produced?
The output targets PDF/A-2, the widely accepted version that supports modern features like JPEG 2000 compression and transparency.
Is the file guaranteed to be compliant?
No converter can guarantee that for every input. Validate the output with a tool like veraPDF whenever compliance is needed.
Can I convert a password-protected PDF?
Yes, after entering its password. The PDF/A copy is saved without encryption, because the standard doesn't allow it.
Why is this tool unavailable on some servers?
PDF/A conversion needs Ghostscript and an sRGB color profile on the server. The Docker deployment includes both, and other servers report which one is missing.