Detect Plagiarism
AI writing analysis that flags passages that look unoriginal or copy-pasted.
Select a PDF to analyze
Extracted text is sent to Claude to generate the report
Click to choose, or drop a file here
Unlike the other tools here, this one sends document text to a server to generate the report.
Related PDF tools
Detect Plagiarism — frequently asked questions
Does this search the internet or academic databases for matches?+
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.
Why did it flag something that isn't actually plagiarized?+
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.
Does this work on scanned PDFs?+
Only if the PDF has a selectable text layer. Purely scanned images with no OCR applied won't have any text to analyze.
Do you upload my files to a server?+
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.
Is there a file size limit?+
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.
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