QuillBot

freemium

QuillBot is a complete AI writing suite with paraphrasing, grammar checking, AI detection, plagiarism checking, summarization, and citation generation. Free to start.

AI Writing Assistants

Paraphrasing Tools

Grammar Checkers

About

QuillBot is a comprehensive AI writing platform that brings eight essential writing tools under one roof, helping students, professionals, content creators, and English language learners write with greater clarity, confidence, and efficiency. Trusted by over 35 million users across 180+ countries and partnered with 140+ academic institutions, QuillBot is one of the most widely adopted AI writing assistants available today. The platform's flagship paraphrasing tool rephrases text in multiple modes — Standard, Fluency, Formal, Simple, Creative, and Humanize — giving users fine-grained control over tone and style. The grammar checker identifies and resolves errors for polished output, while the AI Humanizer transforms AI-generated text into natural, human-sounding writing. For maintaining integrity, QuillBot provides both an AI Detector and a Plagiarism Checker. Additional tools include a Summarizer for condensing long documents, a full Translation feature for unlocking multilingual communication, an AI Chat for brainstorming and idea generation, an AI Image Generator, and a Citation Generator for academic formatting. QuillBot is available as a web application and a widely-installed Chrome extension (rated 4.7/5 with over 5 million users), making it accessible directly within browsers and writing environments. A free tier covers core functionality, while a Premium subscription unlocks advanced paraphrasing modes, increased word limits, and enhanced suggestions. QuillBot is an ideal tool for students, academics, content marketers, ESL learners, and anyone who wants to produce better writing faster.

Key Features

Multi-Mode Paraphrasing Tool: Rephrase text across multiple modes — Standard, Fluency, Formal, Simple, Creative, and Humanize — preserving meaning while adapting tone and style.
Grammar Checker: Automatically detects and corrects grammatical errors, punctuation issues, and awkward phrasing to produce clean, professional writing.
AI Detector & Plagiarism Checker: Analyze text for AI-generated content and scan for plagiarism, giving students and professionals peace of mind before submitting work.
Summarizer & Citation Generator: Condense lengthy articles and documents into concise summaries, and automatically generate properly formatted academic citations.
AI Humanizer: Transform AI-generated drafts into natural, human-sounding text to improve readability and pass AI detection checks.

Use Cases

Students paraphrasing research sources and auto-generating properly formatted citations to complete academic papers faster and with greater integrity.
Content creators rephrasing and humanizing AI-generated drafts to produce natural-sounding blog posts and articles that pass AI detection checks.
Non-native English speakers using the grammar checker and fluency mode to communicate more naturally and professionally in written English.
Professionals polishing emails, reports, and business documents with grammar corrections and style improvements before sending.
Researchers summarizing lengthy academic papers and scanning their own work for plagiarism before journal submission.

Pros

Eight Tools in One Platform: Covers all core writing needs — paraphrasing, grammar, AI detection, plagiarism, summarization, translation, citations, and chat — eliminating the need for multiple separate apps.
Convenient Chrome Extension: The 4.7-star-rated Chrome extension with 5M+ users lets you access QuillBot's tools directly within any webpage or writing environment.
Generous Free Tier: Core tools are available for free, making QuillBot accessible to students and casual users without any financial commitment.
Academic Credibility: Partnered with 140+ academic institutions, making it a trusted and accepted writing aid in educational settings worldwide.

Cons

Key Features Require Premium: Advanced paraphrasing modes like Humanize, longer word limits, and enhanced recommendations are locked behind the paid Premium subscription.
Paraphrasing May Alter Meaning: Automated rephrasing can occasionally shift the intended nuance or meaning of complex or technical sentences, requiring manual review.
AI Detection Limitations: Like all AI detectors, QuillBot's results are probabilistic and may not be 100% accurate for all content types or writing styles.

Frequently Asked Questions

QuillBot is an AI-powered writing platform offering eight tools — including a paraphraser, grammar checker, AI detector, plagiarism checker, summarizer, translator, AI humanizer, and citation generator — to help users write better and faster.

Yes, QuillBot has a free tier that provides access to core features. A Premium plan is available for users who need advanced paraphrasing modes, longer word limits, and additional writing enhancements.

The paraphrasing tool uses NLP-based AI to rephrase input text while preserving its original meaning. Users can choose from several modes — including Fluency, Formal, Creative, and Humanize — to control the output's tone and style.

Yes, QuillBot includes a dedicated AI Detector that analyzes text to assess the likelihood it was generated by an AI model, helping users maintain authenticity and academic integrity.

QuillBot is widely used in academic settings and is partnered with 140+ institutions. It offers tools specifically useful for students, including a plagiarism checker, citation generator, summarizer, and grammar checker.