Plagiarism Checker
Check for duplicated content inside your text and against your own uploaded source files. For full web-scale scanning, integrate a server-side plagiarism API (instructions below).
Upload .txt files you want to compare to (previous drafts, source documents).
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Matched Words
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Similarity
Note: Client-side tool — uploads stay in your browser. For scanning the web, use a server-side paid API.
Matches & Highlights
Matched Sources
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Matches Table
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About Our Tool
This Plagiarism Checker compares text using shingle (n-gram) overlap. It helps identify repeated or copied segments between the pasted content and files you provide. Processing is done in your browser for privacy.
Features
- Compare against multiple uploaded .txt files
- Find internal duplicates inside the same text
- Adjust shingle (word n-gram) size to tune sensitivity
- Export matched snippets as CSV report
Common Uses
- Check drafts vs previous versions to avoid self-plagiarism
- Detect repeated paragraphs inside long documents
- Quick local checks before using a paid web plagiarism scanner
How to Use
- Paste your content into the left textarea.
- Optionally upload one or more
.txtfiles to compare against. - Set shingle (word sequence) size — 3–5 is a good start.
- Click Check Plagiarism to scan and see highlighted matches and a similarity percentage.
- Export a CSV report if you need to share results.
Web-scale plagiarism
This tool is client-side and does not scan the internet. To check against web pages, integrate a server-side plagiarism API (Copyscape, Unicheck, PlagiarismCheck, Turnitin partner APIs, etc.). If you want, I can help add an optional server-side endpoint example that calls a paid API and returns results to this interface.