About Plagiarism Checker
Plagiarism Checker helps students, teachers, writers and SEO professionals find copied text. Compare your text with one or more sources to get a similarity percentage and see every matching passage highlighted, or check your text online to find matching sentences on the web.
How to use Plagiarism Checker
- Paste your text, or load a .txt, .docx or .pdf file.
- Add the source texts to compare against, or switch to "Check online".
- See the similarity score, highlighted passages and matching sources.
Frequently asked questions
How does the similarity score work?
The checker looks for sequences of 5 or more words that appear in the same order in your text and a source. The score is the percentage of your words that are part of such matches. Common short phrases are ignored.
How does the online check work?
We take a sample of distinctive sentences from your text and search the web for each one as an exact phrase. Only matches confirmed by real search results are shown, with a link to the page.
Can it detect paraphrasing?
It finds copied and lightly edited text. Heavily reworded text with the same ideas may not be detected.
Is my text stored?
Compare mode runs entirely in your browser. For online checks, sample sentences are sent to our search provider and are not stored on our server.