Is this plagiarism checker free?

Yes, 100% free. Compare unlimited texts — no signup.

Does it check against the internet?

No. This tool compares two texts you provide against each other. For internet-wide plagiarism checking, you would need a paid service like Turnitin.

Yes. Everything runs in your browser. Your texts are never uploaded.

✓ N-gram matching✓ Highlighted overlap✓ Free forever

Free Plagiarism Checker Online

Q: How does this plagiarism checker work?

It uses n-gram fingerprinting (shingling) and Jaccard similarity to compare two texts. It breaks each text into overlapping word sequences and finds matches between them.

Compare two texts and highlight overlapping phrases. Detect copied content instantly.

Text A (Original)

Text B (Compare)

How to use Plagiarism Checker

Three steps. Instant results.

Step 1

Paste the original text in the left panel.

Step 2

Paste the text to compare in the right panel.

Step 3

See the similarity score and highlighted overlapping phrases.

How Plagiarism Checker works

This tool uses shingling (n-gram fingerprinting) and Jaccard similarity to compare two texts. It breaks each text into overlapping sequences of n words (configurable 3-6), creates a fingerprint set for each text, then calculates the percentage of shared fingerprints. Matching word positions are highlighted in both texts. This method detects rephrased content better than simple string matching. Everything runs in your browser — texts are never uploaded.