PDF to PDF/A Converter — Convert to ISO Archival Format Free Online

Convert your PDF to the PDF/A archival format — the ISO standard for long-term document preservation. Free, no signup required.

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Complete Guide to PDF/A — The Archival PDF Standard

What Is PDF/A?

PDF/A (PDF for Archiving) is an ISO-standardised subset of PDF (ISO 19005) specifically designed for the long-term preservation of electronic documents. Unlike regular PDFs, which may reference external fonts, use encryption, embed JavaScript, or rely on proprietary features, a PDF/A document must be entirely self-contained — it includes everything needed to render the document faithfully without any external dependencies.

The format was developed jointly by ISO and industry partners including Adobe, to ensure that documents archived today can still be opened, read, and printed accurately decades into the future, regardless of what operating systems, fonts, or applications are available then.

What PDF/A Guarantees

A conforming PDF/A file must satisfy strict requirements:

  • All fonts embedded — every font used in the document must be embedded within the file; no system fonts can be substituted
  • ICC colour profiles embedded — colour spaces must include embedded ICC profiles for accurate colour reproduction
  • No encryption — PDF/A documents cannot be password-protected, since archival systems require unrestricted access
  • No external references — no links to external databases, files, or URLs that could become unavailable
  • No JavaScript — no executable code that could become incompatible with future systems
  • XMP metadata — standardised document metadata in XMP format for discoverability
  • No audio or video content — multimedia is not permitted in PDF/A

PDF/A Versions Explained

There are three main versions of the PDF/A standard, each with increasing capabilities:

  • PDF/A-1 (ISO 19005-1, 2005) — the strictest version, based on PDF 1.4. No transparency, no JPEG 2000, no digital signatures with time stamps. Two conformance levels: A (accessibility) and B (basic). Our converter targets PDF/A-1b for maximum compatibility.
  • PDF/A-2 (ISO 19005-2, 2011) — based on PDF 1.7. Adds support for transparency layers, JPEG 2000 compression, digital signatures with embedded time stamps, and PDF/A file attachments.
  • PDF/A-3 (ISO 19005-3, 2012) — same as PDF/A-2 but allows embedding of any file format as an attachment (e.g., XML source data alongside a rendered invoice).

Who Requires PDF/A?

PDF/A is required or strongly recommended in many regulated industries and jurisdictions:

  • Government archives — the US National Archives, UK National Archives, and most European national archives require PDF/A for digital submissions
  • Legal systems — courts in Germany, Switzerland, and many EU member states require PDF/A for official document submissions
  • Healthcare — HIPAA-adjacent archiving requirements in the US and similar regulations in other countries often specify PDF/A for patient records
  • Financial sector — MiFID II and similar regulations require archival of communications and documents in compliant formats
  • Academic institutions — universities and libraries increasingly require PDF/A for thesis submissions and digital preservation projects

Frequently Asked Questions

PDF/A is an ISO-standardised subset of PDF for long-term document preservation. It embeds all fonts, colour profiles, and metadata within the file — ensuring the document can be faithfully rendered decades in the future without external dependencies. Required for legal, government, and healthcare archiving in many jurisdictions.

PDF/A-1 (2005) is the strictest — no encryption, all fonts embedded, no JavaScript, no transparency. PDF/A-2 (2011) allows transparency, JPEG 2000 compression, and digital signatures. PDF/A-3 (2012) allows embedding of arbitrary file attachments. Our converter targets PDF/A-1b for the broadest archival system compatibility.

Government archives, national libraries, courts, and regulated industries in healthcare and finance often require PDF/A for submitted or archived documents. Check your specific jurisdiction's requirements.

PDF/A files are often larger than regular PDFs because all fonts must be fully embedded (not subsetted), and ICC colour profiles add additional data. This size overhead is the trade-off for the guaranteed self-contained rendering capability. If file size is a concern, use the Compress PDF tool after conversion.