What Makes PDF/A Different from a Regular PDF
A standard PDF can reference external fonts, link to external resources, include encrypted content, and embed scripts. These features create dependencies on external resources that may not exist in 20 years. PDF/A removes those dependencies entirely. All fonts must be embedded. All color spaces must be defined in a standard way. External content references are prohibited. JavaScript and encryption are not allowed.
PDF/A Versions Explained
PDF/A-1 is the strictest version, required by many government and legal archiving systems. PDF/A-2 adds support for JPEG2000 compression, layers, and digital signatures. It is a good default for most new archiving workflows. PDF/A-3 allows embedding of arbitrary file types as attachments and is used in e-invoicing standards such as ZUGFeRD. For most use cases, PDF/A-2 is the right choice unless a specific variant is required.
Who Needs PDF/A
Government agencies and courts in many countries require PDF/A for electronic filings, especially in the EU. Law firms and compliance teams convert signed contracts to PDF/A for long-term records retention. Universities use PDF/A for theses and research data that must remain accessible for decades.
How to Produce a PDF/A File
The reliable route is the program that created the document. Word offers File > Save As > PDF > Options > ISO 19005-1 compliant (PDF/A). LibreOffice has a PDF/A checkbox in its export dialog. Adobe Acrobat Pro can convert an existing PDF and report exactly which rules a file breaks. To check any file, veraPDF is the free industry-standard validator. ToolMint does not offer a PDF/A converter. PDF/A requires every font used to be embedded in the file, and a browser cannot add a font program that was never there. We measured this with veraPDF: only image-only scans passed, while ordinary text documents failed on the font-embedding rule. A converter that quietly produced non-compliant files would defeat the point of archiving.
Limitations of PDF/A
Because PDF/A prohibits encryption, a PDF/A file cannot be password protected. Organizations typically store the PDF/A version in a secured document management system. PDF/A also prohibits JavaScript and complex interactive form fields, which means interactive forms cannot be converted to PDF/A while retaining their interactivity.