How to Check for Plagiarism Free Online
Check essays, articles, and documents for plagiarism free. Tools, what they check, and how to avoid unintentional plagiarism.
What Plagiarism Checkers Do
Plagiarism checkers compare your text against a database of web content, academic papers, and other sources to identify passages that match existing published text. They flag matching content with source links so you can review and cite properly.
Free Plagiarism Checking Tools
Duplichecker.com: 1,000 words per search free. Checks against web content.
Small SEO Tools plagiarism checker: 1,000 words free. Multiple checks per day.
Grammarly (free tier): Basic plagiarism check included.
Google Scholar: Manual check — search unique phrases from your text to see if they appear in academic papers.
PaperRater: Academic plagiarism check, free for basic use.
Turnitin and iThenticate
Turnitin is the standard in academic institutions. Students cannot access it directly — it is accessed through educational institutions. If your university uses Turnitin, your submission is automatically checked.
iThenticate is the professional version used by journals and publishers.
What Gets Flagged (and Should Not Worry You)
Common phrases and expressions: "In conclusion", "as a result of", "according to the study" — these are common phrases, not plagiarism.
Proper citations: Text you have correctly cited is not plagiarism but may still be flagged as a match.
Legal text, regulations, and standards: These are by definition reproduced verbatim and most tools recognise them.
Preventing Unintentional Plagiarism
Cite everything you paraphrase: Not just direct quotes — any idea from another source needs a citation.
Use quotation marks for direct quotes: Even short phrases of 3-4 distinctive words need quote marks.
Write first, research second: Draft your own ideas before looking at sources to avoid unconsciously copying phrasing.
Frequently asked questions
Is there a completely free plagiarism checker?
Duplichecker and Small SEO Tools offer free checks up to 1,000 words. For longer documents, you need to check in sections or use a paid tool.
Can I check my thesis for plagiarism for free?
You can use free tools to check sections (1,000 words at a time). For a full thesis check, most universities provide Turnitin access. Alternatively, Grammarly Premium includes full-document plagiarism checking.
Put this guide into practice with our free online tool — no signup required.
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