PDFFly summarises PDFs and lets you question them conversationally, with the notable condition that it works without creating an account. That removes the friction that makes most document tools not worth using for a single file, where signing up takes longer than skimming the document yourself.
The no-account model suits exactly the case it is designed for: an occasional long document, a report, a contract, a paper, that needs to be understood quickly. For that job, being able to open the site and get an answer immediately is the entire value proposition.
It sits within a broader suite of PDF utilities, so related tasks are handled in the same place. Two sensible cautions apply to any summarisation tool: verify anything consequential against the source, and think carefully before uploading confidential documents to a service that requires no account and therefore offers no account-level controls.
