01 — Ranking
The 5 best options, ranked
QuillBot
quillbot.com
4.5The best-known paraphraser, with modes, a synonym slider and a built-in grammar checker.
- Best for
- Rewording sentences and paragraphs with control over how much changes.
- Free plan & limits
- 125 words per paraphrase, with Standard and Fluency modes and a synonym slider. Premium (about $10/month annually) unlocks unlimited words, more modes (Formal, Creative, Academic) and a plagiarism checker.
ChatGPT / Claude / Gemini
gemini.google.com
4.6General AI assistants that paraphrase with precise instructions.
- Best for
- Long passages, tone changes and simplifying text for a given reading level.
- Free plan & limits
- Free tiers with daily caps. Example: 'Rewrite for a 9th-grade reading level, keep every fact and number, keep under 150 words.'
Wordtune
wordtune.com
4.2Sentence-level rewrite suggestions in the browser and in Google Docs.
- Best for
- Polishing individual sentences while you write.
- Free plan & limits
- About 10 rewrites per day on the free plan. Premium removes the limits and adds tones and lengths.
Grammarly
grammarly.com
4.1Grammar checker with AI rewrite prompts.
- Best for
- Clarity and tone fixes inside email, Docs and the browser.
- Free plan & limits
- Free grammar and spelling checks plus a limited number of monthly AI prompts. Full-sentence rewrites are mostly a Premium feature.
Scribbr Paraphrasing Tool
scribbr.com
4.0Free academic-oriented paraphraser, powered by QuillBot.
- Best for
- Students who want a simple interface with no account.
- Free plan & limits
- Free, with a limit of 125 words per paraphrase and no account. Its paid services (plagiarism checks, proofreading) are separate.
02 — Comparison
Side by side
Scroll sideways to see every tool. The first column stays pinned.
| Feature / Criterion | QuillBot | AI assistants | Wordtune | Grammarly | Scribbr |
|---|---|---|---|---|---|
| Free length limit | 125 words | Long (daily caps) | ~10 rewrites/day | Limited prompts | 125 words |
| Rewrite modes / tone | 2 free modes | Any (by instruction) | Paid | Paid | Basic |
| Keeps facts and numbers | Usually | If instructed | Yes (sentence-level) | Yes | Usually |
| Works inside Docs or email | Extension | No | Yes | Yes | No |
| Account required | No | Yes | Yes | Yes | No |
03 — Guide
How to paraphrase with AI step by step
Understand the original first
Read the source and write its main point in one sentence of your own before using any tool. Paraphrasing something you don't understand produces vague, distorted text.
Paraphrase in small chunks
Work 1–3 sentences at a time in QuillBot, or give an AI assistant clear rules: keep all facts, change the sentence structure, match the target tone, and set a maximum length.
Check meaning and facts
Compare against the original: numbers, names, negations ('not', 'only') and qualifiers ('may', 'often') are where paraphrasers introduce errors.
Cite the source
Paraphrased ideas still need a citation. Changing words doesn't make the idea yours, and many schools treat uncited paraphrasing as plagiarism, whether or not a tool was used.
04 — FAQ
Common questions
Is using an AI paraphrase tool plagiarism?
Paraphrasing is legitimate if you cite the source. Using a tool to disguise someone else's work without credit is plagiarism. Many schools also have specific AI-use policies, so check them before submitting AI-assisted work.
Can AI detectors spot paraphrased text?
Sometimes. QuillBot-style rewrites of AI text often lower detector scores, but detectors are unreliable either way. The safer approach is to write in your own words and use tools only for help with clarity.
Which free paraphraser gives the most natural results?
For short passages, QuillBot's Fluency mode keeps the meaning closest. For longer text or a specific tone, ChatGPT, Claude or Gemini with clear instructions usually read most naturally.
What are the best alternatives if I need advanced features?
QuillBot Premium adds unlimited length and 8+ modes. Grammarly Premium adds full-sentence rewrites and tone adjustments across your apps. Wordtune Premium gives unlimited rewrites and summaries. ChatGPT Plus or Claude Pro raise limits for long documents.
Scores reflect our own assessment of free-tier value. Prices and limits change, so check them on each provider's site before you buy.