Plagiarism Checker
FreeCheck originality against billions of web sources with per-sentence analysis.
Free, no signup required · Ctrl+Enter to submit
Plagiarism results will appear here
Paste at least 30 words and click Check Plagiarism to scan for copied content.
Checking for plagiarism...
Scanning web sources and analyzing text
Originality
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Flagged content detected
Use our AI Humanizer to rewrite flagged passages so they're unique and original.
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View PlansFrequently Asked Questions
How does the plagiarism checker work?
Our checker extracts key phrases from your text and searches the web for matches. When web search is available, it finds exact source URLs. It also analyzes text structure, cliche density, and vocabulary patterns to estimate originality even without web search.
Is the plagiarism checker free?
Free users get 3 checks per day with up to 300 words each. The checks include full originality scoring and per-sentence analysis. Upgrade for higher word limits and more daily checks.
What does the originality score mean?
The originality score ranges from 0-100%. A high score (green) means your text appears original. A low score (red) indicates potential matches with existing content online. Use the per-sentence view to identify which parts need rewriting.
Can I fix flagged text?
Yes! If sentences are flagged, click "Humanize Flagged Text" to send them to our AI Humanizer, which will rewrite them to be unique while preserving meaning.
Is my text stored?
No. Your text is analyzed in real-time and not stored permanently. Logged-in users get a brief history entry for convenience, but the full text is never retained beyond processing.
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Coda One's Plagiarism Checker scans your text against billions of web sources to detect copied content. Get an overall originality score, matched source URLs with similarity percentages, and per-sentence analysis highlighting flagged passages. If plagiarism is detected, use the built-in Humanize feature to rewrite flagged text into unique, original content. Free to use with no signup required.