Updated August 2026
This page explains what these tools actually do, where the line sits, and what to use if you want one. It is deliberately not a ranked list of "best" rewriters, for a reason covered below.
What a paraphrasing tool actually does
Paraphrasing means restating someone else’s idea in your own words while keeping the meaning intact. It is a normal, expected academic skill — it is how you show you understood a source rather than just copied it.
A paraphrasing tool automates the restating. The weaker ones swap words for synonyms, which produces stilted text and often mangles technical terms. The better ones use language models to rebuild the sentence, which reads more naturally.
What none of them do is the part that actually matters academically: none of them remove your obligation to cite the source. A paraphrase still carries someone else’s idea, so it still needs attribution. This is the single most common misunderstanding students have about these tools, and it is what turns an innocent use into a misconduct case.
Where the line is
The tool is not the problem. What you do with it is.
| Generally fine | Generally misconduct |
|---|---|
| Rewriting a dense passage for yourself so you can understand it before you write your own version | Running a source through a rewriter and submitting the output as your writing |
| Tidying the phrasing of a sentence you wrote yourself | Rewriting another student’s work to get past a similarity checker |
| Checking whether your paraphrase still says what the original said | Paraphrasing a source and then not citing it because the words changed |
| Using one where your instructor has said it is permitted | Using one where the syllabus or assignment brief forbids it |
The right-hand column has a name in most academic-integrity policies: patchwriting, or plagiarism by paraphrase. We cover how institutions treat it in is using QuillBot cheating? and what happens afterwards in what to do if you get caught plagiarizing.
One rule covers most situations: if you would not be comfortable telling your instructor you used it the way you used it, that is your answer. And if you are unsure whether it is allowed on a specific assignment, ask before you submit rather than after.
Tools students commonly use
These are the mainstream options aimed at writers and students. Free tiers, limits and pricing change often, so check the current terms on each site rather than trusting any article’s figures.
- QuillBot — the best known of the dedicated paraphrasers. Offers several rewriting modes, a synonym slider, and browser and word-processor extensions, with a free tier subject to a character limit per rewrite and a paid tier that raises it.
- Grammarly — primarily a grammar and clarity assistant rather than a rewriter, but its paid tiers include sentence-rewrite suggestions, and it integrates directly into most editors.
- Scribbr — an academic-writing service whose free paraphrasing tool sits alongside its citation generators, which makes it convenient if you are already using it for referencing.
Whichever you use, read the output before it goes anywhere near a submission. Automated rewriters routinely mangle technical vocabulary, invert a negation, or quietly change what a source claimed — which is its own kind of academic problem, separate from plagiarism.
Article spinners are a different category — avoid them
Search for paraphrasing tools and you will also find article spinners: tools built for search-engine content farms to mass-produce many variants of one article. They are marketed on volume, and some are explicitly advertised on their ability to get past AI or plagiarism detection.
They are the wrong tool for coursework for three reasons. Their output quality is tuned for search engines rather than human readers, so it reads badly to a marker. Their whole purpose is disguising the origin of text, which is exactly the behavior academic-integrity policies target. And the category moves fast — tools appear, get rebranded and disappear, so a recommendation from a few years ago is often worthless.
A concrete example of how fast the category turns over: conversion.ai, a rewriting tool recommended in a great many older articles on this topic, now hosts a business-to-business marketing automation platform and is not a paraphrasing tool at all. Any list you read on this subject is worth sanity-checking against the live sites.
Can teachers tell you used one?
Often, yes — and increasingly so. Similarity checkers compare against a corpus rather than looking for identical strings, so a lightly reworded passage can still be flagged, and detectors aimed at AI-generated text have been added to most major platforms. Instructors also notice unprompted shifts in register, mangled terminology, and citations that do not match the claim.
We cover the specifics per platform in does Turnitin detect QuillBot?, can SafeAssign detect QuillBot? and how AI plagiarism detection works.
How to paraphrase well without a tool
This is the skill the tools are standing in for, and it is quicker than it sounds once practiced:
- Read the passage until you can say what it means out loud. If you cannot, you are not ready to paraphrase it — you are ready to reread it.
- Put the source out of sight. Close the tab. Working from a visible original is what produces accidental patchwriting.
- Write the idea in your own words, from memory, in the register of your own essay.
- Compare against the original and check two things: that you have not reproduced distinctive phrasing, and that you have not changed the meaning.
- Cite it. Every time. Changing the words never removes the attribution.
- Quote instead when the exact wording matters — a definition, a legal phrase, a line you intend to analyze. A well-placed short quotation is better writing than a laboured paraphrase.
Frequently asked questions
Is using a paraphrasing tool cheating?
It depends on the use. Rewriting a source to help yourself understand it is normally fine. Submitting a tool’s output as your own writing, or using one to disguise another person’s work, is plagiarism at most institutions. Check the assignment brief, because some explicitly prohibit them.
Do I still have to cite a source if I paraphrase it?
Yes, always. Paraphrasing changes the words, not the ownership of the idea. Failing to cite a paraphrase is one of the most common forms of unintentional plagiarism.
What is the best free paraphrasing tool?
QuillBot is the most widely used free option, with Grammarly and Scribbr also offering free rewriting features. Free tiers and limits change frequently, so check the current terms on each site.
Can Turnitin detect paraphrasing tools?
Similarity checkers compare text against a large corpus rather than only matching identical strings, so reworded passages can still be flagged, and AI-text detection has been added to most major platforms.
Are article spinners the same as paraphrasing tools?
No. Spinners are built to mass-produce article variants for search-engine content and are often marketed on evading detection. They are unsuitable for academic work on both quality and integrity grounds.
Keep reading
Josh Hutcheson — Editor, PriorityLearn
Josh researches, writes, and updates the answers on PriorityLearn, checking each one against current tools, official sources, and real school policies — and flagging what varies by state or district. About PriorityLearn →