Plagiarism Detector is an online plagiarism checking tool that scans text against billions of web sources to detect copied content. It offers a free version with a 1000-word limit per check and supports multiple languages including English, Spanish, German, French, and more. Users can check plagiarism by pasting text, uploading files, or entering a URL. The tool provides a detailed report showing matched sources. A Pro version unlocks deep search, removes ads, increases word limits, and adds features like API access and priority support. The platform also includes a plagiarism checker API for integrating detection into other applications. It is designed for teachers, students, and writers to ensure content originality.