PDF vs PDF/A vs PDF/X: which do you need?
PDF has specialised "flavours" for specific jobs. Two you will meet are PDF/A for long-term archiving and PDF/X for professional printing. Both are still PDFs — just with extra rules.
PDF/A — built to last
PDF/A forbids anything that could stop a file opening decades from now: no external fonts, no JavaScript, no encryption. Everything needed to render the page is embedded. Governments and libraries require it for records.
PDF/X — built to print
PDF/X locks down colour and fonts so a commercial printer gets exactly what you designed. It mandates embedded fonts and defined colour profiles, removing the guesswork from prepress.
A normal PDF — built for everything else
For sharing, signing, forms and the web, a plain PDF is right. It is smaller, can be encrypted, and supports interactive features the strict standards disallow.
For archiving, flatten interactive bits first so nothing can shift over time — the flatten tool bakes everything into the page.
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