No — this isn't a match-against-the-internet checker like Turnitin or Copyscape. Claude reads the document's writing itself and flags passages with signals like sudden tone or vocabulary shifts, generic/templated phrasing, or a voice that's inconsistent with the rest of the text. Treat a flag as "worth a second look," not proof of copying.

Natural writing variety — a technical section reading differently from an introduction, for instance — can look similar to the signals this tool watches for. It's a heuristic, not a certified report; use your judgment on anything flagged.

Only if the PDF has a selectable text layer. Purely scanned images with no OCR applied won't have any text to analyze.

No — every tool here processes your files entirely on your device, and nothing is uploaded to a server. The only exception is the AI tools, which send the extracted text (not the file) to Claude to do their work.

There's no artificial limit we impose, but since processing happens in your browser, very large files (500+ MB or 1,000+ pages) are limited by your device's memory rather than by us.