Meet PDF/A, a safe subset of pdf which enforces certain features and is suitable for archival: https://www.loc.gov/preservation/digital/formats/fdd/fdd000318.s

Meet PDF/A, a safe subset of pdf which enforces certain features and is suitable for archival: https://www.loc.gov/preservation/digital/formats/fdd/fdd000318.shtml https://www.loc.gov/preservation/digital/formats/fdd/fdd0003... PDF/A is in use in several government institutions already, and there are validators out there etc.