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How to reduce plagiarism in a thesis

Find the exact copied phrases, rewrite each idea in your own sentence structure, cite the source, and check again. Swapping a few words with synonyms does not work: plagiarism software matches runs of words, and examiners notice synonym swaps.

Written by Adithyan, a student who builds PaperCheck. Last updated 31 October 2026.

Steps that work

  1. Run a check that shows the matching source for each copied phrase.
  2. For each match, read the source, close it, and write the idea from memory in your own structure.
  3. Add the citation if the idea came from that source.
  4. Use direct quotes, with quotation marks and a citation, for definitions you must keep word for word.
  5. Check again and repeat.

Where similarity hides

Literature reviews, methodology descriptions and standard definitions carry most of the matches. Your own results and discussion usually score low.

What not to do

Do not use synonym spinners, insert hidden characters or swap letters for look-alikes. Modern checkers detect these, and some universities treat them as misconduct.

Check AI writing at the same time

Many universities now also check for AI writing. PaperCheck gives the plagiarism matches and the AI-writing score in one report, so you fix both in one pass.

Common questions

Can I reduce plagiarism by changing words?

Not reliably. Rewrite the idea in your own structure and cite the source.

Is quoting with a citation plagiarism?

No, properly quoted and cited text is not plagiarism, but long quotes still count in some reports, so keep them short.

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