The Most Precise
AI Plagiarism Checker.
Dual-layer detection catches both exact copies and paraphrased content. N-gram fingerprinting for speed, sentence-BERT embeddings for depth. Results in seconds against billions of web pages.
Trusted by 10,000+ Users Worldwide
How Our Plagiarism Checker Works
Our dual-layer engine combines two detection methods for maximum accuracy on both verbatim copies and clever paraphrasing.
N-Gram Fingerprinting
Layer 1 uses weighted 3-gram and 5-gram analysis with longest common run detection to instantly catch exact and near-exact copies.
Sentence-BERT Embeddings
Layer 2 uses neural embeddings to understand meaning, catching paraphrased and rewritten content that word-matching misses.
Deep Web Search
Searches billions of web pages via Google's index, fetches full source pages, and compares every sentence against your text.
A Complete Detection Ecosystem.
Beyond simple matching — our engine analyzes the DNA of your text to ensure absolute originality with source-level evidence.
Dual-Layer Detection Engine
N-gram fingerprinting catches exact copies instantly. Sentence-BERT embeddings catch paraphrased content that word-matching misses. Both layers run on every scan for maximum coverage.
Smart Paraphrase Catching
Goes beyond word-matching to understand meaning. Our sentence-BERT model identifies structural patterns that reveal rewritten content with up to 99% accuracy.
REST API Access
Integrate plagiarism checking into your workflow with our API. Simple POST requests, cURL/Python/Node.js examples, API key authentication, and tiered rate limits.
Deep Search Technology
Searches billions of pages via Google's index. Fetches full source pages for sentence-by-sentence comparison. Results cached with Redis for speed on repeat scans.
From Paste
to Report.
Paste Your Text
Paste or type up to 10,000 characters. Choose standard or deep scan mode for more thorough analysis.
AI-Powered Analysis
Our engine searches the web, fetches full source pages, and runs dual-layer similarity analysis — N-gram fingerprinting plus neural embeddings.
Detailed Report
Get a plagiarism score with highlighted passages, matched sources with URLs, confidence levels, and a clear verdict. Download as PDF or JSON.
Your Text, Protected.
We don't store your text after scanning. Your content is processed in memory and discarded. Privacy is non-negotiable.
Check Your Text Now
Paste your text below and get a detailed plagiarism report in seconds. No account required for your first 3 scans.
Ready to Check Your Text?
Try PlagiarismChecker AI free — no account required for your first 3 scans. Paid plans start at $14/month.
No credit card required.