Check-Plagiarism is an online plagiarism detection tool that uses AI algorithms to scan text against billions of web pages. It helps users verify the originality of their content by identifying exact matches and paraphrased text. The tool supports multiple file formats (doc, docx, txt, pdf) and allows up to 5 files at once for free users. It provides a percentage-based similarity report, highlights plagiarized sections, and offers a rewrite feature to make content unique. The platform also includes a citation assistant and claims 99% accuracy. It is used by writers, students, teachers, and researchers to maintain academic and professional integrity.