How to Check for Plagiarism Online for Free
Duplicate content is one of the most damaging problems you can have on a website. Whether it is accidental — caused by CMS-generated duplicate URLs — or deliberate copying by a third party, Google penalises pages that contain content already published elsewhere on the web. Checking for plagiarism before you publish is an essential step in any content workflow.
Why Plagiarism Matters for SEO
Google's Helpful Content system and Panda-era algorithms actively downrank pages with content that already exists elsewhere on the web. If Google finds two pages with identical or near-identical content, it will typically only show one in the search results — usually the older or more authoritative version. Your page gets filtered out even if you were the original author.
Plagiarism issues can arise from:
- Freelance writers submitting plagiarised or AI-generated content
- Your content being copied and published on other sites without permission
- CMS systems creating multiple URLs for the same content (e.g. pagination, print pages, tags)
- Syndicated content published without a canonical tag
How to Check Plagiarism for Free
Our Plagiarism Checker scans your text against billions of indexed web pages and returns a detailed originality report — completely free, no registration required. Here's how to use it:
- Go to the Plagiarism Checker
- Paste your content into the text box (up to 1,000 words per check)
- Click Check Plagiarism
- Review the originality score and any matching sources highlighted in the results
The tool highlights sentences or passages that match existing web content, and shows you the source URL so you can investigate. An originality score above 90% is generally acceptable for published content.
What to Do If Plagiarism Is Found
If the checker finds matching content, there are several possible explanations and responses:
Your writer plagiarised the content
If the matched content was not in your brief, the writer has copied it. Request a full rewrite. Use our Article Rewriter tool as a starting point, but ensure a human reviews and rewrites the output thoroughly before publishing.
Your content was copied by another site
If the source URL post-dates yours, someone has copied your content. You can submit a DMCA takedown request to the hosting provider or Google Search Console to have the copied content removed. Visit our DMCA Policy page to understand the process.
CMS-generated duplicates
Add canonical tags to all duplicate or near-duplicate URLs to tell Google which version is the original. Check our Meta Tag Generator which includes canonical tag generation.
How Often Should You Check?
Build plagiarism checking into your content workflow as a standard pre-publication step. If you work with freelance writers or agencies, run a check on every piece before it goes live. If you run a large site, use our tool to spot-check high-traffic pages quarterly to ensure your content has not been scraped and republished by a competitor with more authority.
Related Tools
- Grammar Checker — check content for grammar and spelling errors before publishing
- Word Counter — check content length against SEO benchmarks
- Keyword Density Checker — ensure your target keyword appears at the right frequency
Originality is not just an ethical obligation — it is a ranking requirement. Make plagiarism checking a non-negotiable part of your publishing process.
