Compare two texts for similarity and matching phrases — instantly, right in your browser.
This tool uses Jaccard similarity — the number of unique words shared between both texts, divided by the total number of unique words across both — combined with detection of exact matching phrases of five or more consecutive words, a common technique in real plagiarism-detection systems.
Unlike traditional plagiarism checkers, this tool doesn't search the internet or any external database — it only compares the two texts you provide directly in your browser. That makes it useful for checking overlap with a specific source, comparing two drafts, or verifying a rewrite is different enough from the original, without uploading anything.
No. Traditional plagiarism checkers scan a document against a database of web pages and academic papers. This tool compares two specific texts that you provide directly — for example, your draft against a source you're citing, or two versions of your own writing.
It's calculated using Jaccard similarity — the number of unique words shared between both texts, divided by the total number of unique words across both texts — combined with detection of exact matching phrases of five or more consecutive words.
A matching phrase is a sequence of five or more consecutive words that appears identically in both texts. Shorter matches, like common phrases or individual words, aren't flagged since they occur naturally in unrelated writing.
Common words, shared topics, technical terminology, and everyday phrases naturally overlap between unrelated texts. A moderate similarity score doesn't necessarily mean copying — context matters, and matching phrases are more meaningful than the overall percentage alone.
No. This tool runs entirely in your browser using JavaScript. Your text is never uploaded to a server, which makes it safe to use with unpublished drafts or confidential documents.