Free Plagiarism Checker for Students: How to Check Your Paper Before You Submit

What counts as plagiarism?







Copy-paste is only one form. Students also get flagged for:

  • Patchwriting: changing a few words in a source sentence while keeping its structure.
  • Uncited paraphrasing: rewording an idea but not crediting the source.
  • Missing or incorrect citations: a source is used but the reference is incomplete or wrong.
  • Self-plagiarism: reusing your own earlier paper without permission.

Use the free plagiarism checker

The Free Plagiarism Checker accepts pasted text of up to 5,000 words, or an uploaded .txt, .doc, .docx or .pdf file. You don’t need an account. After you run it, you get a percentage score, highlighted sections, and source links for possible matches. You can fix the flagged parts, re-check, and download a report.

The page says the analysis runs in your browser and your text isn’t stored. That’s the site’s own claim, so read its privacy policy before pasting anything sensitive.

How to read your score

  • 0–10%: Excellent. Submit with confidence.
  • 11–15%: Good. A quick review is enough.
  • 16–25%: Warning. Review your citations and paraphrasing.
  • 26–50%: High risk. Major revisions needed.
  • 51–100%: Severe. Rewrite.

Remember that similarity is not the same as plagiarism. Properly cited quotes, common phrases and your reference list all raise the number. Read the highlighted passages instead of reacting to the percentage alone. Acceptable limits also differ between schools, so check your syllabus.

Where free checkers fall short

The tool describes itself as an educational first check. It doesn’t have access to the databases behind Turnitin or SafeAssign, and its AI-writing detection is basic. A low score is encouraging, but it isn’t a guarantee. If your school gives you an official checker, use it for the final pass.

Quick pre-submission checklist

  1. Put quotation marks and a citation on every direct quote.
  2. Cite the source of every paraphrased idea.
  3. Check that each in-text citation matches an entry in your reference list.
  4. Run the draft through the checker and review each highlighted section.
  5. Revise, then re-check.

Keep reading

I cover the types of plagiarism and the habits that prevent it in more detail in my Substack post: How to Check Your Paper for Plagiarism Before You Submit It.

Ready to check your draft? Try the free plagiarism checker here.

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