# Paraphrasing without plagiarism — a guide with examples

> Paraphrasing means more than swapping synonyms. Here's how to write clean paraphrases, add correct citations, and avoid patchwork and misquotation.

Acurio · 2026-05-12 · Paraphrase, Plagiarism, Academic writing

The most common question in the final phase of writing a thesis is: "Is this good enough as a paraphrase, or does it already count as plagiarism?" The answer doesn't depend on how many words you swapped out, but on whether you've genuinely transferred the idea into your own language — and whether a citation backs it up. This post shows you what clean paraphrasing looks like in practice, which mistakes are typical, and how to recognise a good paraphrase.

## What is a paraphrase, really?

A paraphrase is the rendition of someone else's idea in **your own words** plus a **citation**. Both parts are mandatory. Without your own language, it's a disguised verbatim quote. Without a citation, it's plagiarism ([see plagiarism vs. misquotation](https://acurio.ch/en/blog/plagiarism-vs-miscitation)).

What a paraphrase is **not**:

- Swapping a few words for synonyms ("showed" → "demonstrated").
- Reversing the sentence order while leaving the rest unchanged.
- Writing the original sentence "slightly differently" and hoping it's enough.

A clean paraphrase only emerges when you have truly **understood** the idea and then reformulate it **without looking** at the source.

## When to paraphrase instead of quoting directly?

A good rule of thumb: around 90 per cent of your citations should be paraphrases. Keep direct quotations for three cases:

- **Precise definitions** the author has formulated themselves.
- **Characteristic turns of phrase** that matter in your argument.
- **Provocative formulations** whose exact wording is part of your analysis.

Everything else — findings, arguments, models, theories — you paraphrase. That makes your text more readable, shows you understood the material, and significantly reduces the risk of plagiarism.

## The 5-step method for a clean paraphrase

This sequence is unglamorous but reliably works:

1. **Read.** Read the relevant passage twice, until you could explain the idea aloud in a single sentence.
2. **Put the source aside.** Close the book; move the PDF to another tab. This is the most important step. As long as the original sentence is in front of you, you're copying it.
3. **Write in your own words.** From memory. Your own sentence structure, your own vocabulary, your own rhythm.
4. **Compare.** Only now reopen the source. Is the statement accurate? Did you add nothing and lose nothing? Are there no overly long verbatim word strings left?
5. **Add the citation.** Author, year, page number. Before the full stop, not at the end of the paragraph.

Anyone who skips step 2 produces synonym-paraphrases — and therefore plagiarism.

## Table: original, poor, and good paraphrase

| Original | Poor paraphrase (too close to the original) | Good paraphrase |
| --- | --- | --- |
| "Social media amplify polarisation because algorithms favour content that triggers strong emotional reactions." (Mueller 2023, p. 42) | Social media promote polarisation, as algorithms favour content that triggers strong emotions (Mueller 2023, p. 42). | Mueller (2023, p. 42) traces the polarising effect of social media back to the logic of recommendation systems: content that stirs strong emotion is pushed more often. |
| "Lithium-ion batteries lose a significant proportion of their usable capacity at temperatures below freezing, because ion mobility in the electrolyte decreases." (Weber 2021, p. 117) | Lithium-ion batteries lose a large part of their capacity in sub-zero temperatures, as ion movement in the electrolyte slows (Weber 2021, p. 117). | In frost, a lithium-ion battery performs noticeably worse; the reason is the reduced mobility of ions in the electrolyte (cf. Weber 2021, p. 117). |

What's wrong with the poor column: the same sentence structure, the same order of arguments, only individual words swapped. From a plagiarism-checker's perspective this sits on the edge — from an examiner who knows the source, it's clearly not your own work.

## Citation formats: Harvard and footnotes

**Harvard / author-date system.** Citation in the running text, directly after the statement:

> Recommendation systems favour content with high emotional activation (Mueller 2023, p. 42).

**Footnote variant.** Superscript numeral at the end of the sentence, full citation in the footnote:

> Recommendation systems favour content with high emotional activation.¹

Which system to use is determined by your department. What matters: be consistent. Mixing formats is an avoidable point deduction.

### When "cf." is required

"cf." (compare) precedes citations for **paraphrases**, not for direct quotations. In the humanities and law it's a convention; in the natural sciences it's often omitted. Check your department's style guide. If it says nothing: placing "cf." before every paraphrase is never wrong — omitting it sometimes is.

## Common paraphrasing mistakes

### Patchwork paraphrase

You piece together a paragraph from sentences drawn from two or three sources, without clearly separating them. To the reader it looks like your own synthesis — but it's assembled from fragments. Fix: one clear idea per paragraph, one unambiguous citation per statement. If two sources support the same point, name both ("Mueller 2023, p. 42; Weber 2021, p. 117").

### Synonym paraphrase

Word-for-word swaps with an unchanged sentence structure. Technically a paraphrase, in practice a disguised verbatim quote. Plagiarism checkers now reliably flag this, because they examine sentence scaffolding, not just word strings.

### Paraphrase without citation

The most common beginner mistake: you've read the source, you know where the idea comes from, but you forget the citation. From the reader's perspective it's your own idea — so it's plagiarism. Rule of thumb: every sentence that didn't come from your own head needs a source.

### Overly free paraphrase

You rephrase so freely that the statement goes beyond what the source actually says. That's no longer plagiarism — it's a **misquotation** ([see plagiarism vs. misquotation](https://acurio.ch/en/blog/plagiarism-vs-miscitation)). In grading terms, often worse than plagiarism, because it's counted as an academic error.

## AI paraphrasing tools: not a solution

DeepL Write, ChatGPT, QuillBot, and similar tools will rephrase a sentence at the click of a button. They do **not** solve your plagiarism problem, for three reasons:

- The **citation** is still missing unless you add it yourself.
- The tools typically swap only at word level, not sentence structure — that's a fancier synonym-paraphrase, nothing more.
- They occasionally **shift** the statement. "Suggests a correlation" becomes "shows a correlation". That is then a misquotation, and the examiner will find it.

AI tools are useful for smoothing a sentence linguistically. They don't replace understanding the source.

## Four complete examples with citation

**1. Social science.** Original idea: Societal crises intensify existing inequalities.
Paraphrase: Crisis phases do not have an equalising effect; rather, they widen social inequality that already existed before the crisis (cf. Schmidt 2020, p. 88).

**2. Natural science.** Original idea: Microplastics are toxic to soil organisms.
Paraphrase: Initial studies show measurable toxic effects of microplastics on soil fauna, particularly on earthworms (cf. Lehmann et al. 2019, p. 234).

**3. History.** Original idea: The Reformation would not have been possible without the printing press.
Paraphrase: The rapid spread of Reformation writings was bound to the printing press — without it, the Reformation's momentum would have been unthinkable (cf. Burke 2015, p. 56).

**4. Law.** Original idea: Federal Supreme Court rulings have no formal binding effect in Switzerland, but in practice exert significant steering influence.
Paraphrase: Even without formal precedent-binding, cantonal courts regularly orient themselves by the rulings of the Federal Supreme Court (cf. Häfelin/Haller/Keller 2020, para. 217).

In all four examples the structure is identical: your own formulation, a clear statement, citation before the full stop.

## How Acurio helps

Clean paraphrasing is most dangerous exactly where statement and source quietly drift apart — and that drift often happens only in the third revision, long after you last had the original sentence in front of you. [Acurio](https://acurio.ch/) reads every paraphrase in your thesis against the uploaded source PDFs and reports back for each statement: supported, partially supported, or unsupported. That's how you catch synonym-paraphrases, patchwork passages, and overly free paraphrases — before the examiner does.

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Paraphrasing is a technique, not a matter of luck. Read the source, put the source aside, write freely, compare, add the citation — five steps that together cost less time than a single plagiarism finding caught after the fact.


## Frequently asked questions

### Is a paraphrase without a citation plagiarism?

Yes. From a reader's perspective, an uncited paraphrase looks like your own idea — even if you genuinely read and understood the source. Every sentence that didn't originate in your own head needs a citation.

### Do I need 'cf.' before every paraphrase?

It depends on your department's style guide. In the humanities and law, 'cf.' before paraphrases is standard convention. In the natural sciences it's often omitted. When the guide is silent: adding 'cf.' is never wrong — omitting it sometimes is.

### Can AI tools like ChatGPT or QuillBot help with paraphrasing?

They can smooth a sentence linguistically, but they cannot replace understanding the source. They typically swap words only, not sentence structure — making them a fancier synonym-swap. They also don't add missing citations and occasionally shift the meaning, turning a paraphrase into a misquotation.

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Source: https://acurio.ch/en/blog/paraphrasing-without-plagiarism