Does the fingerprint prove who made the PDF?

No. It proves two files are identical. Authorship needs a certificate-based digital signature.

Are my PDF files uploaded?

No. The document is opened and rewritten inside your browser. It is never sent to a server, and closing the tab discards it.

JavaScript is turned off. InspireTools processes files in your browser, so the tools need JavaScript to run.

Get a PDF's SHA-256 fingerprint and its document details to prove which version you have.