AI Paper Checker — Free, With Flagged Lines
An AI paper checker grades research papers, reports and coursework for AI-generated patterns. Papers are riskier than casual text: longer paragraphs, formal register and citation-heavy sections all score higher on detectors — including papers written entirely by humans. Here's how to check yours and what the score means.
Why papers score differently from blog posts
Academic register is exactly the register large language models imitate best. Formal transitions, hedged claims ("it is important to note"), and uniform paragraph structure are standard in papers and standard in model output — so detectors weight them heavily. The result: a well-structured paper written by a careful student can score higher than a sloppy blog post written by ChatGPT.
What to check, section by section
| Section | Typical risk | Fix |
|---|---|---|
| Introduction & conclusion | Highest — models write these most "AI-ly" | Rewrite rhythm; cut stock phrases |
| Literature review | Summary voice reads as generated | Add your own evaluative sentences |
| Method & results | Low (numbers, passive voice) | Usually fine as-is |
| Discussion | Medium — hedging language | Vary sentence length; commit to claims |
Run the full paper through our free detector in 1,500-word chunks (unlimited runs), then fix flagged lines with the 5-step workflow. Citations and quotes stay untouched by design — see how humanizing handles references.
The similarity score is a different number
Don't confuse the AI score with the plagiarism/similarity percentage. Similarity measures overlap with existing sources; the AI score measures writing patterns. A paper can be 2% similar and 80% AI-flagged, or the reverse. If you're staring at a Turnitin percentage, start with what a good similarity score actually is.
Check your own text — free, no login
Paste any essay, paper or paragraph. See the AI score and exactly which lines and terms trigger it, then humanize up to 1,500 words per run.