Free Plagiarism Checker for Students
Detect self-plagiarism, AI-generated content, and unusual phrase repetition — all in your browser. No uploads, no server, 100% private.
What this tool can and cannot do: It detects self-plagiarism, AI writing patterns, and repeated phrases inside your document. It cannot check against Google, websites, or academic databases — that requires a server. All detections shown are from inside your document only. Use the Verify Online links to manually check suspicious sentences on Google Scholar.
How This Plagiarism Checker Works
Upload or Paste
Upload .docx or .txt, or paste text. No character limits.
Real Analysis
Self-plagiarism detection, AI-pattern analysis via 7 statistical signals, and phrase repetition detection.
Verify Manually
Use the built-in Google / Scholar links to check suspicious sentences against the real internet.
Frequently Asked Questions
❓ Is this plagiarism checker really free?
Yes, 100% free. No signup, no credit card, no usage limits.
❓ Can I upload Word documents?
Yes, .docx and .txt are supported. For .doc files, save as .docx first.
❓ Is there a character limit?
No. You can paste entire theses or research papers — no limit.
❓ Is my document private?
Completely. Everything runs in your browser. Your text never leaves your device.
❓ Can it check against websites?
No — that requires a server. Use the "Verify Online" buttons to manually search on Google and Google Scholar.
❓ Does it detect AI-generated content?
Yes, using 7 statistical signals: sentence uniformity, burstiness, transition-phrase density, vocabulary richness, word length, passive-voice ratio, and hedging language.
❓ What score should I aim for?
Originality above 80% is generally safe. AI likelihood below 30% is low-risk. Always verify with your institution's policy.
📚 Tools Every Student Needs
100% Private. Your documents are never uploaded to any server. All analysis runs in your browser. No data collection. Works offline after page load.