CopyChecker
Free online plagiarism checker that scans text for similarity, highlights matches, and shows source details.
Features
- Free account allows 1,500 words checked per month
- Each scan supports up to 1,000 words of text
- Highlights matched sentences or sections within your document
- Shows similarity percentage and unique content percentage
- Provides matching source details for verification
- Supports file uploads (PDF, DOC, DOCX, TXT) up to 5 MB
- Paid plans include downloadable PDF plagiarism reports
- Multi-language support for 13 languages
- Works on desktop and mobile browsers
- Uploaded content is deleted after each scan
CopyChecker is an online plagiarism checker that helps you review the originality of your writing before submitting or publishing. With a free account, you can scan up to 1,500 words per month, with each individual check supporting up to 1,000 words.
The tool compares your text against a broad index to find exact and partial matches, then generates a clear report showing your similarity percentage, unique content percentage, and highlighted sections where text overlaps with existing sources. It also provides available source details so you can verify matches and decide whether to rewrite or add citations. File uploads are supported for PDF, DOC, DOCX, and TXT formats up to 5 MB, and paid plans include downloadable PDF reports.
CopyChecker is built for students, teachers, writers, bloggers, SEO teams, researchers, and businesses who need to check essays, assignments, articles, or any written content across 13 languages. Uploaded files are deleted after scanning, and the checker works on both desktop and mobile browsers.