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pdfFiller vs Smallpdf: catalog facts
pdfFiller	Smallpdf
Paid Paid subscription service that starts with a free trial.	Freemium A limited free tier is available. Pro is a paid subscription.
iOS, Web, Browser extension	Windows, Android, iOS, Web
Form filling, e-signing and signature requests in one place Drag-and-drop builder for fillable forms	Clean, fast interface that covers the common PDF chores Desktop and mobile apps alongside the browser tools
Paid service after the trial Documents are processed and stored in the vendor's cloud	Free use is capped at a couple of documents per day Files are processed on their servers
Downloadable app, Web application, Browser extension	Web application
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.