What is PlagiarismCheck.org? PlagiarismCheck.org is a reliable and easy-to-use advanced similarity and AI-checking tool that makes learning better and more honest by detecting similarities and chat GPT usage. Besides plagiarism, the tool can check your text for grammar and spelling mistakes, search across scientific content and your personal repository, help with citation or essay topic generation, and evaluate the assignment strength before turning it in. Key features: AI Detector — catches exact matches, paraphrased text, and ChatGPT usage. Constantly updated algorithms flag Claude, Gemini, Grok, GPT-5, and all its earlier models with 90% or higher accuracy. Fingerprint — pinpoints each user’s unique writing style characteristics and checks the authorship of any document in almost no time. Grading — speeds up your workflow with custom rubrics and in-text comments. All grades automatically sync with Moodle, Canvas, Google Classroom, Brightspace, Blackboard, Populi, and other LMSs as PlagiarismCheck.org integrates with them via API. Its advanced AI algorithms catch changes in sentence structure, hidden characters, and synonyms. In addition, our tool recognizes properly formatted quotes and references, thus reducing the number of false alarms. Supports 15+ languages and a wide range of sources - сhecks texts against the latest Internet publications and millions of articles, including scholarly content. Ensured data security and privacy — PlagiarismCheck.org is GDPR-compliant and supports the European policy to protect clients’ personal information to guarantee the safety of your private data. PlagiarismCheck integrations with major LMS allow you to access similarity scores and view user-friendly, detailed similarity reports conveniently. Flexibly configure what sources should be considered as similar, and reduce the noise by excluding quotes, references, and self-plagiarism. You can request additional integration with your LMS or use our API to connect PlagiarismCheck.org to any other tool for your convenience. That is why it is widely used by educational institutions, businesses, and individual users.