PDF/A vs. Canonical PDF: What's the Difference?
· 6 min read
PDF/A and canonical PDF sound like they should solve the same problem. Both are about making PDFs more reliable. Both matter to compliance teams. Both show up when engineers start asking whether a document will still mean the same thing later.
But they are not the same thing.
PDF/A answers: Will this document remain renderable and self-contained for long-term preservation?
Canonical PDF answers: Will this input produce stable bytes, a stable hash, and a record of what changed?