Text ToolsFree
Plagiarism Checker
Compare two texts and detect similarity, matching sentences, and shared content percentage instantly.
Paste an original text and a text to check. This tool computes word-level and sentence-level similarity between the two — useful for teachers checking student submissions, or checking paraphrasing.
How it works
Paste an original reference text and the text you want to check into the two panels, then click Check Similarity. The tool computes word-level Jaccard similarity, identifies matching sentence pairs, and shows an overall similarity percentage with highlighted matches.
Why use this tool?
Teachers use it to compare student submissions against source material. Writers use it to ensure paraphrased content is sufficiently original. It's a fast, private, client-side plagiarism similarity tool with no uploads to third-party servers.
Frequently Asked Questions
How does this plagiarism checker work?
It compares two texts using sentence-level similarity analysis and Jaccard similarity scoring to detect shared content.
Is it free?
Yes, 100% free with no sign-up. It runs entirely in your browser.
Can it check against the internet?
This tool compares two texts you provide. It's ideal for comparing a student submission against a source or checking for self-plagiarism.
What similarity score is considered plagiarism?
Generally, above 30% similarity warrants review. Above 50% is considered high similarity. Context matters — some overlap is natural in academic fields.
Rate this tool:
Was this tool helpful?