Plagiarism Checker
Verify text originality. Scan for duplicated phrases and compare against source material to ensure unique content.
0 words · 0 5-grams · 0 duplicate instances
Compare against a second text to detect cross-document overlap using 5-word n-grams
Plagiarism Heuristic Results
% Uniqueness
— · 5-gram heuristic—
0
Total 5-grams0
Duplicate phrases—
Source matchesUnique 5-grams: 0Words: 0
Method: tokenize on whitespace, normalize to lowercase alphanumeric, split into 5-grams (sliding window), count duplicates within text and intersection with source n-grams. Uniqueness = 100 × (1 − plagiarized instances / total 5-grams), where plagiarized = duplicate occurrences beyond the first + source-matched instances.
More Text & Documents
About the author
Written and maintained by the Tool4SaaS team. Every tool runs locally in your browser and is tested in-house for accuracy. Last updated: .
Frequently asked questions
No, checks internal duplicates and against pasted source. No web search, fully local.
Yes, 5-gram duplicate scanning and source comparison run locally; text stays on-device.
Yes, it is free, works offline in your browser, and your data never leaves your device.
How to use Plagiarism Checker
- Paste text: Paste main text.
- Add source: Optionally paste source to compare.
- Check: See uniqueness % and duplicate phrases.