What Is QuillBot? The World's Most Popular AI Paraphrasing and Writing Tool
QuillBot is the world's most popular AI paraphrasing tool with over 50 million monthly users, designed to help writers, students, researchers, and non-native English speakers rewrite sentences, improve clarity, and avoid plagiarism. Unlike general AI writers like ChatGPT or Jasper, QuillBot specializes in taking existing text and transforming it — rewording for clarity, changing tone, summarizing long passages, or generating citations.
The free plan gives you 125 words per paraphrase (no daily limit), access to 2 of 9 rewriting modes (Standard and Fluency), grammar checker, and basic summarizer features. QuillBot Premium ($4.17/month annual) unlocks unlimited paraphrase length, all 9 modes including Creative and Academic, plagiarism checker, faster processing, and citation generator.
QuillBot was acquired by Learneo (owner of Course Hero and Scribd) in 2021 and continues to dominate the student and academic writing market globally.
Who Made QuillBot? The Provider Behind the Tool
QuillBot is developed by QuillBot, Inc. (now a subsidiary of Learneo, formerly Course Hero), a Chicago-based edtech company. QuillBot was originally founded in 2017 by three University of Illinois computer science students — Rohan Gupta, Anil Jason, David Silin, and Nikhil Agarwal — who built the first version as a college project.
The company was acquired by Course Hero (now Learneo) in 2021 for an undisclosed sum, joining a suite of education technology products that serve over 100 million students worldwide. QuillBot continues to operate under its own brand while benefiting from Learneo's infrastructure and distribution.
Key Features of the Free QuillBot Plan in 2026
- 125-word paraphrases — no daily limit on number of paraphrases.
- 2 rewriting modes — Standard and Fluency on free plan.
- Grammar checker — basic grammar and spelling correction.
- Summarizer — condense long passages into key points (1,200 words input).
- Synonyms and slider — adjust how much the output changes vs. the original.
- Word-freeze — protect specific terms from being changed.
- Browser extensions — Chrome, Edge, Safari.
- Google Docs integration — paraphrase directly inside Docs.
- Microsoft Word add-in — use in Word documents.
- Mobile apps — iOS and Android for on-the-go paraphrasing.
Premium adds Formal, Academic, Simple, Creative, Expand, and Shorten modes, unlimited input length, faster processing, plagiarism checker, and citation generator.
Why Use QuillBot? The Real Benefits for Users
QuillBot's biggest strength is specialized paraphrasing that preserves meaning while changing wording significantly — more reliable than asking ChatGPT to "rewrite this." The 9 modes (Standard, Fluency, Formal, Academic, Simple, Creative, Expand, Shorten, Custom) give precise control over output style.
For students and ESL writers, the Synonyms slider is uniquely useful. Drag it from conservative (minor changes) to aggressive (complete rewrite) and see alternative word choices for any sentence — helping non-native English speakers learn vocabulary and phrasing as they write.
The all-in-one writing suite is another huge benefit. Paraphrasing, grammar checking, plagiarism detection, summarization, and citation generation live in one tool — eliminating the need for separate subscriptions to Grammarly, Turnitin, and Zotero for basic academic workflows.
Where Can You Use QuillBot? Platforms and Integrations
- Web app at quillbot.com — primary interface with all tools.
- Chrome extension — paraphrase on any website text box.
- Edge and Safari extensions — same as Chrome.
- Google Docs add-on — inline paraphrasing in Docs.
- Microsoft Word add-in — use inside Word (macOS and Windows).
- iOS app — paraphrase on iPhone and iPad.
- Android app — same features as iOS.
- QuillBot API — developer access for enterprise integration.
When Should You Use QuillBot? Best Use Cases
QuillBot is ideal for academic writing, content rewriting, and ESL learning. Top use cases include: paraphrasing research paper content to avoid plagiarism; rewriting academic essays for clarity and originality; summarizing long research articles and textbook chapters; generating citations in APA, MLA, Chicago, IEEE formats; improving grammar and punctuation for non-native English speakers; rewording existing content for SEO variation; simplifying complex technical writing for general audiences; creating multiple versions of product descriptions; rephrasing social media posts; and learning English vocabulary through synonym suggestions.
It is less ideal for generating fully original content from scratch (ChatGPT or Claude are better), writing novel fiction, creative storytelling, or anyone seeking a fully unlimited free paraphrase tool (QuillBot's free word limit is 125 per paraphrase).
How to Use QuillBot — Step-by-Step Guide for Beginners
Go to quillbot.com and start using it immediately — no signup required for paraphrasing. Sign up for an account (free, email or Google) to save history.
Paste your text into the left panel (up to 125 words on free). Select a mode from the top (Standard is default; Fluency adjusts for readability). Click Paraphrase. The rewritten version appears on the right. Drag the Synonyms slider to control how aggressive the rewrite is.
Click any word in the output to see alternatives and pick a different synonym. Use the Word-freeze feature to protect technical terms from being changed. Switch to Summarizer, Grammar Checker, or Citation Generator tabs at the top to access other tools. Install the Chrome extension to paraphrase on any website or Google Doc.
QuillBot Free vs Paid Plans — Full 2026 Pricing
- Free — 125-word paraphrases, Standard and Fluency modes, grammar checker, basic summarizer, browser extensions.
- Premium ($19.95/month, $79.95/year = $6.66/month, or $49.95/year long-term = $4.17/month) — unlimited words, all 9 modes, plagiarism checker, citation generator, faster processing, tone insights.
- Team (custom) — shared workspace, admin controls for schools and businesses.
Students often get discounts through school partnerships. QuillBot offers a 3-day free trial on Premium.
Alternatives to QuillBot Worth Trying
- Grammarly — better for grammar and tone, weaker on paraphrasing.
- Wordtune — strong paraphrasing competitor with alternative phrasings.
- ChatGPT or Claude — more flexible but require prompt engineering for consistent paraphrasing.
- Paraphraser.io — free alternative with simpler features.
- Spinbot — older paraphrasing tool, less accurate but fully free.
Final Thoughts — Is QuillBot Worth Using in 2026?
Yes — for students, researchers, ESL writers, and anyone who regularly paraphrases existing content, QuillBot remains the best specialized tool in 2026. The free plan handles casual use, and Premium at $4.17/month (annual) is one of the cheapest AI writing subscriptions on the market — offering genuine value beyond what general chatbots provide for paraphrasing-specific workflows.