Copyscape
Verified working Sep 22, 2026
A web-focused plagiarism checker for finding copied online text.
Copyscape checks web pages and submitted text against online content to help identify duplicate or copied material. It is aimed at publishers, SEO teams, content marketers, educators, researchers, and companies that need originality checks before or after publication.
Why it stands out
- Long-running plagiarism service with more than two decades of use in online content checking.
- Designed around public web duplicate detection rather than only classroom submissions.
- Includes both one-off checking and ongoing monitoring through Copysentry.
- API and enterprise offerings make it usable inside larger editorial or content-delivery workflows.
- Explicitly addresses human-written and AI-generated content that may reuse online text.
Good to know
- Free access appears limited; unlimited searches and API access require Copyscape Premium.
- Detection is focused on copies found on the public web, so private databases or offline documents may not be covered.
- Copysentry monitoring is a separate product from one-off plagiarism searches.
- It checks for duplicated text, not broader questions such as factual accuracy, authorship, or whether text was AI-generated.
Photos
Publishers, SEO teams, and content managers can vet articles for copied web text before publication. Check whether AI-assisted drafts contain passages that already appear online. Monitor a website for newly discovered copies of its content. Run originality checks inside a content workflow through the paid API. Add plagiarism-warning banners to web pages as a deterrent.
Web-based plagiarism search, Copyscape Premium for expanded checking, Copyscape API for integrations, Copysentry for automated web monitoring and email alerts, enterprise options, free comparison tool, and free anti-plagiarism banners.
Technical Notes
- Copyscape offers a dedicated API for programmatic plagiarism checks.
- The page indicates API access is tied to Copyscape Premium rather than the free checker.
Alternative listings
Checks essays for copied text while flagging writing and citation issues.
Writing & Content Creation ToolsGrammarly’s plagiarism checker lets users paste or upload a document and scan it for potential copied passages. It pairs originality checking with Grammarly’s broader writing feedback, including grammar, readability, word choice, citation formatting, and AI-use disclosure guidance.
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Writing & Content Creation ToolsSmallSEOTools Plagiarism Checker is a web-based originality scanner for essays, articles, assignments, and other written work. Users can paste text, upload common document formats, or scan a URL, then review similarity scores, matched source links, and sentence-level flags.
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Similar sites elsewhere
- Quetext — quetext.com
- Turnitin — turnitin.com
- Grammarly Plagiarism Checker — grammarly.com/plagiarism-checker
- DupliChecker — duplichecker.com
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