PDF/A conversion is not built yet. PDF/A is a compliance standard, not a file tag: real conformance requires verifying that every font is embedded, stripping forbidden features such as encryption and JavaScript, embedding a colour profile, and then validating the result against the profile you are claiming.

Labelling a file PDF/A without that verification would be worse than not offering it at all, since these documents are usually destined for legal or archival systems that will reject or silently mis-handle a non-conforming file. Proper conversion and validation tooling is needed first.