Most PDF converters push you toward a subscription fast — free tiers with watermarks, ads, or a 2-task daily cap, and no way to pay for just one busy day. Stamped keeps the free tier genuinely usable, states its real limits upfront instead of hiding them, and adds a one-time day pass for people who just need it once — no subscription required. No ads, no watermarks, and file merging (combining several files into one PDF) built in from the start.