Duplicate Content Checker

In short This compares two documents you supply and reports the matching phrases, a similarity percentage and the longest shared passages. It is a text-comparison tool, and the limit is the one that matters most: **it cannot search the web**. It will not detect copying from a source you have not pasted in, which is what most people mean when they say plagiarism check. Institutions use subscription databases covering published work, the web and previously submitted student papers, and this has access to none of them. What it is genuinely good for is the case where you already have both documents: checking whether a supplier's copy was reused across clients, comparing a draft against the source you were working from to see how much survived verbatim, or checking two versions of your own text. On the percentage itself — a similarity figure means very little without reading the matches. Quoted material, references and common phrases all match legitimately, and a high number with every match being a citation is a well-referenced document rather than a problem.