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ChatPDF vs LightPDF: catalog facts
ChatPDF	LightPDF
Freemium Free to use, with a paid Plus upgrade.	Freemium Free online tools, with a paid Pro plan for full editing and AI features.
Web	Windows, macOS, Android, iOS, Web
Answers cite the passages they come from Folders for chatting across several files	Available on web, desktop and mobile Editing, conversion, OCR and signing in one tool
Documents are processed on a remote service Chat history is only saved after signing up	Full features require a Pro subscription Online tools send documents to the vendor's servers
Downloadable app, Web application	Downloadable app, Web application
Closed source	Closed source
License not stated	License not stated
No 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 23, 2026	Official website Full listing and sources Checked September 24, 2026

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