How to paraphrase in a research paper without plagiarizing
Short answer: a paraphrase restates a source's idea in your own words and sentence structure, and still cites the source. Swapping a few words for synonyms while keeping the original structure — called patchwriting — is still plagiarism, even with a citation. The reliable method is to understand the passage, put it away, write the idea from memory in your own framing, then compare and cite.
Paraphrase, summary or quotation?
- Paraphrase when the idea matters but the wording does not — this is the normal way to use sources in scientific writing.
- Summarise when you need the gist of a whole paper or section in a sentence or two.
- Quote only when the exact wording matters: a definition, a striking claim you are going to analyse, or wording you disagree with. Use quotation marks and a page number where the style requires one.
A five-step method
- Read until you understand the passage and why it matters to your argument.
- Note the idea, not the sentences: a few keywords, in your own shorthand.
- Write from memory, with the source closed, in the order your argument needs.
- Compare with the original: if a run of words or the sentence skeleton matches, rewrite that part. Technical terms can stay — there is no other word for “mitochondria”.
- Cite it in the style your journal uses. A paraphrase without a citation is plagiarism of ideas.
An example
Original: “Regular aerobic exercise was associated with a 30% reduction in the risk of cardiovascular events among adults over 60 in the cohort.”
Patchwriting (not acceptable): “Frequent aerobic exercise was linked with a 30% decrease in the risk of cardiovascular events in adults older than 60 in the cohort (Smith, 2021).” — the same skeleton with synonyms swapped in.
Paraphrase: “In Smith's cohort of older adults, those who did aerobic exercise regularly had almost a third fewer heart attacks and strokes (Smith, 2021).” — the idea is the same; the framing and structure are new, and the source is cited.
Common mistakes
- Changing the words but keeping the sentence order and structure.
- Paraphrasing a long passage sentence by sentence — the overall structure is still copied.
- Citing once at the end of a paragraph built from several sources.
- Dropping the citation because the wording is now your own.
- Changing a technical term to a synonym that means something different.
How to cite a paraphrase
Cite a paraphrase exactly as you would a quotation, in your journal's style: (Smith, 2021) in APA, a numbered reference such as [12] in IEEE or Vancouver. Page numbers are optional for a paraphrase in APA but helpful when you paraphrase one specific passage of a long work.
- When a paragraph draws on several sources, cite each claim where it appears, not once at the end.
- When you paraphrase a source that you found cited in another paper, read and cite the original if you can; otherwise cite it as quoted in the paper you read.
- Common knowledge in your field — facts found in many sources and not disputed — does not need a citation. When in doubt, cite.
The citation generator builds the reference from a DOI in APA, MLA, Chicago or BibTeX, so the citation you add to a paraphrase is correct.
Using a paraphrasing tool responsibly
A paraphrasing tool can suggest alternative wordings, but it does not understand your argument and it cannot add the citation for you. Use it on your own drafts, keep technical terms and numbers fixed, read every suggestion, and keep the citation. The paraphrasing tool freezes citations and key terms so they survive the rewrite.
Before you submit, run a plagiarism check: it finds passages that still follow a source too closely, including reworded ones, and shows the source next to your text.