QuillBot is an AI writing assistant built around paraphrasing and grammar correction, with additional tools for detecting AI-generated text, checking plagiarism, and rewriting AI output to sound more natural. It's aimed at students, academics, and professionals who need to polish or rework written text quickly, and it's owned by Learneo, a company that started at the University of Illinois.
What does QuillBot do?
QuillBot's original and best-known tool is its paraphraser, which rewrites a sentence or paragraph in a chosen mode, such as Standard, Fluency, or Formal, while trying to keep the original meaning intact. Around that core, QuillBot has built out a full writing suite: a grammar and punctuation checker, an AI content detector, a plagiarism checker, a summarizer, a citation generator, and an AI humanizer that rewords AI-generated text to read more like a person wrote it.
More recently QuillBot has expanded past pure writing into a broader creation platform, adding an AI chat assistant, an AI image generator, PDF editing and conversion tools, and design templates for resumes, social posts, and presentations. All of these live inside one account and can be used from the web app, browser extensions, a Word add-in, or mobile apps.
Because QuillBot's tools evolved out of academic writing help, its grammar and citation features are particularly geared toward students and researchers, while the paraphraser and humanizer see heavy use from content writers and marketers.
Core features
- Paraphrasing tool with multiple rewriting modes, including Standard, Fluency, Formal, and custom modes on paid plans.
- Grammar and punctuation checker with advanced writing suggestions and tone insights on Premium.
- AI content detector that estimates whether a piece of text was written by AI.
- AI humanizer that rewrites AI-generated text to reduce AI detection scores and read more naturally.
- Plagiarism checker that scans submitted text against published sources, with a monthly word allowance.
- Summarizer that condenses long text into shorter custom summaries.
- Citation generator supporting APA, MLA, and Chicago formats.
- Browser extensions and a Word add-in that bring QuillBot's suggestions into Gmail, Google Docs, and Microsoft Word.
Use cases
Students and academics use QuillBot to rephrase source material in their own words, check for accidental plagiarism before submitting a paper, and generate properly formatted citations. Its grammar checker and summarizer also help with long reading assignments and research papers.
Content writers, marketers, and business owners use the paraphraser and AI humanizer to adjust drafts, avoid repetitive phrasing across pieces, and rework AI-assisted drafts so they read less like generic AI output before publishing.
Pricing
QuillBot offers a free plan that includes basic paraphrasing up to 125 words per rewrite, limited AI humanizer use, and basic grammar checking. Premium, billed annually, costs $8.33 per month and unlocks unlimited paraphrasing, unlimited AI humanizer use, unlimited AI detector scans, an expanded plagiarism checker allowance, and unlimited AI chat. A separate Team plan is available for organizations that need centralized billing and usage management, with pricing set by request.
How to use QuillBot
- Create a free QuillBot account or install the Chrome extension, Word add-in, or mobile app.
- Paste or upload the text you want to work with into the Paraphraser, Grammar Checker, or another tool.
- Choose a rewriting mode, such as Standard or Fluency, if you're using the paraphraser, and review the suggested changes.
- Run the AI detector or plagiarism checker if you need to verify originality before submitting or publishing.
- Use the AI humanizer on any AI-generated draft you want to sound more natural.
- Export or copy the finished text back into your document, email, or content management system.
Frequently asked questions
Is QuillBot free to use?
Yes. QuillBot has a free plan with limited paraphrasing, grammar checking, and humanizer use. A Premium subscription removes the word limits and unlocks the full toolset.
What does the AI humanizer do?
It rewrites AI-generated text to reduce the chance it gets flagged by AI detectors and to make the phrasing read more like natural human writing.
Can QuillBot check for plagiarism?
Yes. Its plagiarism checker compares submitted text against published sources, with a monthly word allowance included on the Premium plan.
Does QuillBot work inside Word and Google Docs?
Yes. QuillBot offers a Microsoft Word add-in and browser extensions for Chrome, Edge, and Safari that bring its tools into Gmail and Google Docs as well.
Learn more at QuillBot.