PaperCheck checks a whole research paper for AI-written text for free: 5 checks a month, up to 20,000 words each, from Word or PDF, with every flagged sentence marked and a plagiarism check in the same report.
Written by Adithyan, a student who builds PaperCheck. Last updated 31 October 2026.
Most free detectors take a few hundred pasted words and give one number. A paper has an abstract, methods, results and references, and the parts that matter are spread through it. Checking the whole file shows where the AI-like writing is.
On 909 AI-written and 469 human-written papers it had never seen, it caught 98% of the AI papers and wrongly flagged 0.43% of the human ones. No detector is proof, so treat a flag as a line to look at, not a verdict.
Yes. Sign in with Google and you get 5 checks a month, up to 20,000 words each.
No. Your paper is deleted when the check finishes and is never used for training.
Check your paper: 5 free checks a month
PaperCheck is not affiliated with Turnitin, GPTZero, papercheck.in or papercheck.ai. Scores from any detector are estimates, not proof.