A paraphrase is restating someone else's thought in your own words. It is an entirely legitimate and necessary part of academic writing — most of an essay is paraphrase, not quotation.
It turns into plagiarism when one of three requirements is not met. Not two. All three.
The three requirements
- The language must be yours. Not the original's sentences with synonyms swapped in, but your own phrasing.
- The structure must be yours. Follow the source's order sentence by sentence and you have translated it, not processed it.
- The source must be there. However well you reword it, the idea is not yours, and the citation belongs with it.
The third is the one most people miss. There is a widespread misunderstanding that citation applies only to direct quotations. It applies to the thought.
What it looks like in practice
The original:
"The industrial revolution did not merely change modes of production; it upended the entire structure of the family, as work moved out of the home and into the factory."
Bad paraphrase
The industrial revolution did not just alter methods of production; it overturned the whole structure of the family, since labour shifted out of the home and into the factory.
Every word has been swapped for a synonym while the skeleton of the sentence stands exactly as before. That is mosaic plagiarism — and a citation does not save it, because the reader still believes the phrasing is yours. If the text is to stand like that, it belongs in quotation marks.
Good paraphrase
The rise of the factory pulled work out of the household, and that displacement had consequences well beyond production: the family as a unit was reorganised around it (Hobsbawm, 1962).
Both the order and the language are new. The point is the same, but it has been understood and retold — not translated. And the source is right there.
The technique that works
The trouble with paraphrasing is almost always that you are looking at the original while you write. Your brain borrows its rhythm.
- Read the passage twice.
- Put it away, out of sight.
- Write the point down as you would explain it to someone who has not read the text.
- Only then look back — to check you understood it correctly, not to fetch phrasing.
- Add the citation.
If you cannot restate the passage without looking, you have not understood it yet. That is useful information in itself.
About rewriting tools
Tools that promise to make a text "plagiarism-free" by swapping words and flipping clauses produce bad paraphrases by definition: they work on the surface, because the surface is all they have access to. The result is the first box above, only more systematically.
It is also the kind of rewriting that is easiest to spot — the language becomes imperceptibly flatter and more generic than the rest of your text. And if the source is not named, the citation problem is exactly as large as it was before.
The rule of thumb
If you can put your version and the original side by side and a reader can follow them sentence for sentence, it is not a paraphrase. It is a rewrite, and it either goes in quotation marks or gets done again.