Your supervisor says the similarity is too high and asks you to “bring it down”, but every honest rewrite seems to produce the same sentences. The instinct is right and the conclusion is wrong. Similarity falls when you change how you use sources, not when you disguise the same text, and the techniques that work also make the chapter better.
This article is part of our guide How to Write a Master’s Thesis by the Mastermind PhD team and relates to our Paraphrasing & Plagiarism Check service. Sources last checked: November 2026.
To reduce Turnitin similarity honestly, this guide starts with what not to touch, then works through six legitimate techniques with before and after examples, and explains why synonym swapping and paraphrasing tools make things worse: Turnitin notes that spun text can score low while remaining unoriginal, its AI detector treats AI-paraphrased text as AI-generated, and universities such as Oxford classify close paraphrase without acknowledgement as plagiarism.
What does reducing similarity legitimately mean? It means removing matches that signal weak source use (uncited copying, close paraphrase, over-quotation, serial summaries of single sources) by rewriting from understanding and citing correctly, while leaving legitimate matches (quoted definitions, reference lists, standard terminology) in place or excluded by the report’s filters. The meaning of every claim stays the same; only its expression and its attribution change.
Before you reduce Turnitin similarity, start with the report
Open the report and sort the highlights before you rewrite anything. Reference lists, correctly quoted text and short common phrases are not problems; the filters for bibliography, quotes and small matches exist for them, and our guide to reading a Turnitin report explains each one. What remains after filtering falls into a few categories, and only some call for rewriting.
| What you see | Diagnosis | Action |
|---|---|---|
| Long passage in one color, cited once at the end | Close paraphrase or copying with a token citation | Rewrite from understanding; cite each borrowed idea |
| Sentence matched verbatim with a citation but no quotation marks | Turnitin’s “Missing Quotations” case | Add quotation marks and page number, or paraphrase properly |
| Three consecutive paragraphs each matching one different article | Serial summaries that follow each source’s structure | Synthesize across sources by theme |
| Questionnaire items, scale names, statistical formulas | Legitimate shared wording | Cite the instrument; quote verbatim items |
| Definition in quotation marks with author, year and page | Correct quotation | Leave it |
| Phrases of a few words everywhere | Linguistic coincidence | Leave it; the small-match filter removes them |
What should you never change?
Do not delete correct quotations to reduce Turnitin similarity; a quoted definition is evidence, and Turnitin’s quote filter excludes text inside recognized quotation marks (“…”, ‘…’, «…», „…”) and indented block quotes in Word files. Do not reword technical terms, instrument names, variable labels or standard statistical phrasing; examiners expect them, and altering them introduces errors. Do not touch the reference list. If these legitimate matches inflate your figure, the answer is the filter, not the delete key.
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Technique 1: Quote correctly and sparingly
Direct quotation is for wording that matters in itself: a definition you analyze, a legal or policy text, a participant’s words, a phrase whose exact form is under discussion. Everything else should be paraphrased. When you do quote, reproduce the words exactly inside quotation marks, give author, year and page, and use block format for long quotations according to your style guide.
Before (cited but not quoted, so it appears as “Missing Quotations”): Organizational commitment is a psychological state that binds the employee to the organization and reduces the likelihood of turnover (Author, 2020).
After: Author (2020, p. 12) defines organizational commitment as “a psychological state that binds the employee to the organization”, a definition adopted here because it isolates the attachment component from behavioral intentions.
The match is now excluded by the quote filter, so this step alone helps reduce Turnitin similarity, and the sentence does more work than before, because it says why the definition was chosen.
Technique 2: Synthesize instead of summarizing one source at a time
The highest similarity in most theses comes from literature reviews written as a parade: one paragraph per study, each following the abstract’s structure. Synthesis reorganizes the same findings around a question, and because the organizing logic is yours, so are the sentences, which is how synthesis helps reduce Turnitin similarity.
Before: Smith (2019) studied 200 nurses and found that transformational leadership increased commitment. Lee (2021) surveyed 350 teachers and found a similar positive effect. Garcia (2022) examined bank employees and reported that the effect was weaker in large branches.
After: Across three service sectors, transformational leadership predicts commitment, but the strength of the relationship varies with organizational size: the effect reported for nurses (Smith, 2019) and teachers (Lee, 2021) shrinks in large bank branches (Garcia, 2022), which suggests that proximity to the leader conditions the effect and motivates the inclusion of unit size as a moderator in the present study.
Nothing was invented and no finding was changed; the after version simply states what the three studies mean together. These examples are illustrative, with invented authors.
Technique 3: Paraphrase from understanding, not from the page
Purdue’s Online Writing Lab describes an effective paraphrase as your own rendition of the essential information in a new form and gives a procedure: reread the original until you understand it fully, set it aside, write your version from memory, compare it with the original to check that the meaning is intact, put quotation marks around any unique phrase you kept, and record the source and page. Oxford’s guidance explains why this matters: altering a few words and changing their order, or closely following the structure of an argument, is plagiarism without due acknowledgement. Harvard’s guide calls the result of changing a few words here and there “mosaic plagiarism”.
Original (invented for this example): Students who receive timely feedback on drafts revise more extensively and report higher confidence in their writing than students who receive feedback only on the final submission.
Word swapping (not acceptable): Learners who get prompt feedback on drafts revise more thoroughly and report greater confidence in their writing than learners who get feedback only on the final version.
Paraphrase from understanding (acceptable): The timing of feedback appears to matter as much as its content: when comments arrive while a text is still in draft, students use them to revise and gain confidence, whereas comments delivered after submission change little (Author, 2023).
The acceptable version restates the finding in a new sentence structure, adds the interpretive frame of the writer, and still cites the source.
Technique 4: Cite every borrowed idea at the point of use
A single citation at the end of a paragraph leaves every earlier sentence looking uncited, which is exactly what the “Not Cited or Quoted” match group picks up. APA guidance allows a long paraphrase to carry one citation at first mention, as long as the context makes clear that the same work continues to be paraphrased, and asks you to reintroduce the citation when the paraphrase moves to a new paragraph or switches between sources. To reduce Turnitin similarity in this match group, put the citation where the idea enters, use narrative citations (“Lee (2021) found”) to mark where a source begins, and make clear with a phrase such as “the present study” where your own voice resumes.
Technique 5: Restructure the literature review around your questions
Restructuring is also a way to reduce Turnitin similarity, because the score tracks structure. A review that follows the organization of one textbook or one review article will match it even when every sentence is rewritten. Draft a map first: each research question, the two or three debates it rests on, the studies that belong to each debate, and the gap your study fills. Then write to the map. Headings organized by theme or by variable, rather than by author, change the architecture of the chapter, and that is where much persistent similarity lives.
Technique 6: Handle methods wording honestly
Methods chapters match for legitimate reasons: published questionnaire items, standard definitions of sampling procedures, and the fixed vocabulary of statistical tests. Quote instrument items verbatim with a citation to the instrument, describe procedures as what you did with your sample in the past tense rather than copying what a manual says a procedure is, and explain the analysis decisions you made (why this test, which assumptions you checked, how you handled missing data). Your decisions cannot match anyone else’s text.
Why synonym swapping and paraphrasing tools fail
Three documented reasons explain why these shortcuts do not reduce Turnitin similarity in any meaningful way. First, the result is still someone else’s text. Oxford treats paraphrase by altering a few words as plagiarism when due acknowledgement is missing, and Harvard treats mosaic plagiarism as plagiarism even when some material is cited.
Second, the tools are detected. Turnitin’s AI Writing Report states that it detects text that was likely AI-generated and then modified by an AI bypasser, AI paraphrasing tool or word spinner, and names Quillbot as an example; the output is highlighted as AI-generated. Turnitin also notes, in its guide to plagiarism, that content spinners can produce a low similarity score for work that is not original, which is why a low number protects nobody.
Third, the text gets worse: technical terms are replaced with wrong synonyms, hedges disappear, and sentences stop meaning what the source meant, which is a change of meaning in the wrong direction.
How much will the score fall?
Nobody can promise a figure when you reduce Turnitin similarity, and Turnitin itself notes that filters may or may not change the percentage depending on overlapping sources. What the techniques above change reliably is the composition of the report: the “Not Cited or Quoted” group shrinks, the remaining matches become quotations and references that filters exclude, and the examiner who opens the report finds nothing to pursue. That is the goal; the number follows.
Re-check and keep your evidence
Re-run the check on the final version after you reduce Turnitin similarity, with the same filter settings your faculty will use. Keep your dated drafts, notes and reference-manager library; they show how the text was produced if anyone asks. If you work with our team, every file comes back with a Turnitin report and an AI check, and similar passages are reworked without changing the meaning, with the sources cited as they should be. The chapter remains yours to defend, which is the only test that matters in the viva.
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Frequently asked questions
Does deleting quotations reduce similarity?
It lowers the number and weakens the chapter. Correctly quoted and cited text is legitimate, and Turnitin’s quote filter excludes it from the score when the quotation marks are recognized characters. To reduce Turnitin similarity, ask for the filter rather than removing evidence.
Is changing a few words enough to count as paraphrasing?
No. Oxford’s guidance states that altering a few words and their order, or closely following the structure of an argument, is plagiarism if due acknowledgement is not given, and Harvard describes the same practice as mosaic plagiarism. A paraphrase is a new sentence that carries the same meaning and a citation.
Will a paraphrasing tool get past Turnitin?
Turnitin’s AI Writing Report states that it detects likely AI-generated text that was further modified by AI paraphrasing or bypasser tools and highlights it as AI-generated, and its plagiarism guide notes that spun text can score low while remaining unoriginal. The similarity number may fall; the risk rises.
How many citations does a paraphrased paragraph need?
Enough to show where each idea came from. APA allows one citation at first mention for a continuous paraphrase of one work, repeated when the paraphrase moves to a new paragraph or draws on several sources. Place citations where ideas enter, not only at the end.
Which chapter usually produces the most similarity?
The literature review, because it is built from other people’s findings, followed by the methods chapter, where instrument items and standard procedures match legitimately. To reduce Turnitin similarity there, synthesis fixes the first; quoting instruments and describing your own decisions fixes the second.
Sources
- Turnitin. Turnitin and plagiarism. https://guides.turnitin.com/hc/en-us/articles/34400565079053 (accessed October 2026)
- Turnitin. How exclusion filters refine the Similarity Report. https://guides.turnitin.com/hc/en-us/articles/23539146689549 (accessed October 2026)
- Turnitin. Using the AI Writing Report. https://guides.turnitin.com/hc/en-us/articles/22774058814093 (accessed October 2026)
- University of Oxford. Plagiarism (student guidance on academic good practice). https://www.ox.ac.uk/students/academic/guidance/skills/plagiarism (accessed October 2026)
- Harvard College Writing Program. What Constitutes Plagiarism? Harvard Guide to Using Sources. https://usingsources.fas.harvard.edu/what-constitutes-plagiarism-0 (accessed October 2026)
- American Psychological Association. Paraphrases. APA Style. https://apastyle.apa.org/style-grammar-guidelines/citations/paraphrasing (accessed October 2026)
- Purdue Online Writing Lab. Paraphrase: Write It in Your Own Words. https://owl.purdue.edu/owl/research_and_citation/using_research/quoting_paraphrasing_and_summarizing/paraphrasing.html (accessed October 2026)
Sources last checked: November 2026. This article is general educational guidance and does not replace your university regulations or your supervisor’s instructions. How we prepare our content.