Paste your text, paste your sources, and get an instant similarity score with every copied phrase highlighted. No uploads, no accounts, no word limits — the check runs entirely in your browser.
Yes — completely free, with no signup and no word limits. The check runs entirely in your browser, so your text never leaves your device and nothing is stored or uploaded.
It compares your text against the source documents you paste, using 6-word phrase matching. Any 6+ word run found in your sources is flagged and highlighted, and the similarity score is the share of your words that match. It is a local similarity check, not a web-scale scan.
No. This tool checks only the documents you add as sources — there is no web index and no server. For comprehensive web coverage, your institution's plagiarism service (Turnitin-style) is the right tool. This checker is for fast, private spot-checks against documents you already have.
Never. The analysis runs entirely in your browser via JavaScript. There is no server call, no account, and no retention — which also means the checker works offline.
As a rule of thumb: under 10% is typically incidental phrasing, 10-30% suggests significant overlap worth rewriting, and above 30% is high-risk in most academic settings. Always check the highlighted phrases themselves — the score alone is not a verdict.