Documents received from external sources need to be checked since not all PDF creation tools produce documents that comply 100% with the PDF/A standard.
Second, documents need to be tested as the final step in the production and electronic filing process. A valid PDF/A document can be invalidated as a result of editing or inserting transparent images, for example, into the document.
In both cases, these invalid PDF/A documents may still display as valid PDF/A documents.
pdfDocs PDF/A validator
With pdfDocs you can create PDF/A documents that comply with the standard. You can also use the PDF/A validator tool to ensure documents you receive from external sources also comply with the standard.
In addition to validating a single document, you can select a number of documents in a folder to check for compliance.