You upload a thesis to a university repository, documents to a tender platform, or files to a digital archive — and get a message: "The file must be PDF/A". Your regular PDF looks exactly the same and opens everywhere, yet the system rejects it. That is because PDF/A is a strict subset of PDF with extra rules guaranteeing the document will render identically in 10 or 50 years.
The short answer: upload your document to our online PDF to PDF/A converter. It converts the file to PDF/A-2b (ISO 19005-2): embeds fonts, ties colors to an ICC profile, and removes encryption, JavaScript, and external dependencies. Free, no registration, no watermarks.
Quick answer: PDF to PDF/A in 4 steps
- Open PDF to PDF/A and upload one PDF up to 100 MB.
- Click Convert to PDF/A — the file is processed on our server in the background.
- Download the PDF/A-2b document from the link.
- Optionally verify compliance with the free veraPDF validator.
What PDF/A is and why it exists
PDF/A ("A" for Archive) is the ISO 19005 family of standards for long-term preservation of electronic documents. PDF/A-1 appeared in 2005, developed by archivists, librarians, and software vendors who saw that regular PDFs can depend on external resources. Typical risks: fonts that are not embedded and get substituted on another device; device-dependent colors; encryption whose password may be lost; external links and multimedia that disappear; JavaScript whose behavior depends on the viewer. PDF/A forbids or strictly regulates all of these, making the file fully self-contained.
PDF/A versions and conformance levels
- PDF/A-1 (2005) — based on PDF 1.4; the strictest, with no transparency, layers, or JPEG 2000.
- PDF/A-2 (2011) — based on PDF 1.7; allows transparency, layers, JPEG 2000, and embedded PDF/A files. The most versatile choice today.
- PDF/A-3 (2012) — like PDF/A-2 but allows embedding any file type, such as XML for e-invoices.
- PDF/A-4 (2020) — based on PDF 2.0, less widely supported so far.
Conformance levels: b (basic) guarantees reliable visual reproduction; u adds Unicode mapping for all text; a (accessible) requires a tagged logical structure, which usually needs manual work. Our converter produces PDF/A-2b. If a recipient demands a specific level such as PDF/A-1a, you will need specialized software.
PDF/A vs regular PDF
| Feature | Regular PDF | PDF/A-2b |
|---|---|---|
| Font embedding | Optional | Required |
| Colors | May be device-dependent | Tied to an ICC profile |
| Encryption and passwords | Allowed | Forbidden |
| JavaScript, multimedia | Allowed | Forbidden |
| Transparency and layers | Yes | Yes |
| XMP metadata | Optional | Required |
| Opens in normal viewers | Yes | Yes |
PDF/A is still a PDF — any browser opens it. Acrobat may show a PDF/A banner and open it read-only to protect compliance. If a system needs a raster file instead, see PDF to TIFF.
Where PDF/A is required
Requirements are set by the receiving organization, so always check its rules. In practice PDF/A is often requested by:
- national and institutional archives accepting electronic records for permanent storage;
- corporate document management systems where records are kept for years;
- some court e-filing systems;
- tender and procurement platforms of certain buyers;
- universities and libraries collecting theses, dissertations, and papers for their repositories;
- e-invoicing, typically PDF/A-3 with embedded XML.
We do not claim that any particular authority strictly mandates PDF/A — rules differ between organizations and change over time. If a specific version or level is listed in the requirements, follow it exactly.
Step-by-step: converting PDF to PDF/A online
- Prepare the document. Convert Word files first with Word to PDF; combine multiple parts with Merge PDF.
- Remove protection. PDF/A forbids encryption, so unlock password-protected files first.
- Open the converter. Go to PDF to PDF/A. No sign-up.
- Upload. One PDF up to 100 MB.
- Convert. Click Convert to PDF/A. Ghostscript embeds fonts, adds an ICC profile and metadata, and removes disallowed elements.
- Download and review. Check that everything looks right, then validate with veraPDF if needed.
- Sign last. If a digital signature is required, sign the finished PDF/A — any change after signing invalidates it.
How to validate PDF/A with veraPDF
A PDF/A flag in metadata does not prove compliance; the content must be checked. veraPDF is a free, open-source validator developed with the PDF Association and regarded as the industry reference. Install it on Windows, macOS, or Linux, open your file, choose the PDF/A-2B profile (or auto-detect), and click Validate. Errors are listed with references to specific clauses. From the command line:
verapdf --flavour 2b document_pdfa.pdf
Some receiving systems use their own validators; if veraPDF passes but the system rejects the file, ask which version and level it expects.
What changes in the file
Fonts are embedded (usually adding tens or hundreds of kilobytes), an ICC profile and XMP metadata are added, colors are converted to RGB with a profile (print CMYK may shift slightly), JavaScript, multimedia, and external file links are removed, interactive forms may be flattened, and encryption is dropped. If the result exceeds a size limit, compress the PDF first and convert afterwards — compressing after conversion can break compliance.
Alternative ways to create PDF/A
Microsoft Word and LibreOffice
Word's Save as PDF options include a PDF/A compliance checkbox; LibreOffice's Export as PDF offers PDF/A-1b, -2b, or -3b. Pros: free or already installed, good text quality. Cons: only for source documents, not existing PDFs.
Adobe Acrobat Pro
The PDF Standards / Preflight tools convert to any PDF/A level and fix errors. Pros: professional control, supports levels a and u. Cons: paid.
Ghostscript
Our service uses Ghostscript. A simplified PDF/A-2b command (a definition file with an ICC profile is also needed):
gs -dPDFA=2 -dBATCH -dNOPAUSE -dPDFACompatibilityPolicy=1 -sColorConversionStrategy=RGB -sDEVICE=pdfwrite -sOutputFile=document_pdfa.pdf PDFA_def.ps document.pdf
Common problems and fixes
Password-protected PDF
If you know the password and may use the file, run Unlock PDF first.
Damaged file
Structural errors cause failed conversions and validator warnings. Try Repair PDF.
File too large
Compress or split it if the recipient accepts several files.
Validator reports errors
Typical issues are fixed automatically, but full compliance cannot be guaranteed for every exotic file, such as one with broken fonts. Re-export the source from Word or LibreOffice with the PDF/A option, or print to a fresh PDF and convert again.
Blurry text or changed colors
Blur usually means the source is a scan — the converter does not change image resolution. Color shifts come from CMYK-to-RGB conversion.
Scan not searchable, or signature invalid
There is no OCR in this tool; try our PDF reader with OCR (beta). A signature applied before conversion always becomes invalid — convert first, then sign.
Security and privacy
No registration. Files are processed on our server in a background queue, results are downloaded by link, and both the source and the PDF/A are automatically deleted within 48 hours. Nothing is published or shared. For documents that must never leave your network, use LibreOffice or Ghostscript offline.
FAQ
Can I convert PDF to PDF/A online for free?
Yes — free, no registration, no watermarks.
Which PDF/A version do I get?
PDF/A-2b according to ISO 19005-2.
How is PDF/A-2b different from PDF/A-1b?
PDF/A-2 is based on a newer PDF version and allows transparency, layers, and JPEG 2000. If PDF/A-1 is strictly required, use LibreOffice or Acrobat.
Is PDF/A mandatory for submissions?
It depends on the organization. Always check the recipient's requirements.
How do I verify a file is PDF/A?
Validate it with the free veraPDF tool.
Can I edit a PDF/A?
Technically yes, but edits may break compliance. Edit the source and convert again.
Will a scan become searchable?
No, this tool has no OCR.
Conclusion
PDF/A guarantees your document looks the same for years on any device: fonts inside, colors tied to a profile, no passwords, scripts, or external dependencies. Upload your file to our PDF to PDF/A converter, download the result, and validate it with veraPDF if needed — free, no registration, no watermarks.