Key Features

  • Paraphraser (7 modes: Standard, Fluency, Formal, Academic, Simple, Creative, Custom)
  • Grammar Checker and AI Proofreader
  • AI Detector (text and images)
  • Plagiarism Checker (25,000 words/month on Premium)
  • AI Humanizer (make AI-generated text sound natural)
  • Summarizer
  • Translator
  • Citation Generator (APA, MLA, Chicago)
  • AI Chat
  • AI Image Generator and Editor
  • Background Remover
  • ChatPDF (ask questions about any PDF)
  • PDF Editor, Merger, Splitter, Converter
  • Presentation Creator
  • Chrome, Edge, Safari, Word extensions
  • iOS, Android, macOS, Windows apps

What Is QuillBot?

QuillBot is an AI writing assistant that started with a single, genuinely useful capability — paraphrasing text — and has expanded systematically into a comprehensive writing and productivity platform. The paraphraser remains its defining feature: paste any text, choose from 7 different modes (Standard, Fluency, Formal, Academic, Simple, Creative, or Custom), and get a rewritten version that preserves the original meaning while changing the phrasing, structure, or register.

The tool suite built around this core is extensive. The Grammar Checker and AI Proofreader catch errors beyond basic spell-check — punctuation, sentence structure, word choice, and tone. The Plagiarism Checker scans content against online sources. The AI Detector identifies AI-generated text in submissions. The AI Humanizer rewrites AI-generated content to sound more natural. The Summarizer condenses long documents. The Translator handles multiple languages. The Citation Generator formats references in APA, MLA, Chicago, and other styles automatically.

More recently, QuillBot has expanded into adjacent productivity tools: ChatPDF lets you ask questions about any PDF document, a full PDF editing and conversion suite handles document management, an AI Image Generator and Image Editor cover visual content, and a Presentation Creator builds slide decks from prompts. Extensions for Chrome, Edge, Safari, Microsoft Word, and apps for iOS, Android, macOS, and Windows mean the tools are available wherever you work.

QuillBot is part of Learneo, Inc. — the same parent company as Course Hero — which provides institutional stability and ongoing investment in the product's development. It's partnered with 140+ educational institutions, which has made it particularly embedded in the academic writing market.

Best for

Students and Academic WritersESL and Non-Native English WritersContent Writers and BloggersJournalists and ResearchersProfessionals Writing Reports and EmailsEducators and TeachersSmall Digital PublishersAnyone Repurposing or Localizing Content

Use cases

Academic essay paraphrasing and rewritingGrammar and spell checking for professional documentsPlagiarism detection before submissionAI content detection for academic integrityResearch paper summarizationCitation generation for academic papersTranslation for multilingual contentEmail and professional communication improvementContent repurposing and reformattingPDF editing, merging, and conversion

Key features explained

Paraphraser — 7 Modes for Every Writing Context

QuillBot's Paraphraser is the most capable AI paraphrasing tool available. It offers 7 distinct modes that produce meaningfully different outputs from the same input text. Standard is the default all-purpose mode. Fluency prioritizes natural, readable output. Formal adjusts register for professional or academic contexts. Academic produces the elevated, precise language expected in scholarly work. Simple reduces complexity and improves accessibility. Creative takes liberties with structure and phrasing for expressive content. Custom lets you define your own style parameters. On Premium, there's no word limit — paste an entire essay or article and rewrite it in one operation. The Freeze Words feature lets you lock specific terms (technical vocabulary, brand names, proper nouns) so they're preserved unchanged in the output. For students, journalists, and content writers who regularly work with existing text that needs rewriting, this is the tool that makes QuillBot indispensable.

AI Detector and AI Humanizer

QuillBot's AI Detector analyzes text to identify patterns characteristic of AI-generated content — useful for educators checking student submissions, publishers verifying content authenticity, and writers who want to ensure their AI-assisted work doesn't read as machine-generated. A separate AI Image Detector applies the same analysis to images. The AI Humanizer is the complementary tool: it takes AI-generated text and rewrites it to reduce the detectable AI patterns — varied sentence rhythm, more natural transitions, less formulaic structure. The effectiveness varies depending on the original AI output and the detection system it's tested against, and QuillBot makes no absolute guarantees, but for most standard use cases the Humanizer produces meaningfully more natural-sounding output. Both tools are available on Premium.

Plagiarism Checker — 25,000 Words/Month on Premium

QuillBot's Plagiarism Checker scans text against a database of online sources and academic publications to identify matches and potential plagiarism. Premium users get 25,000 words per month of plagiarism checking — enough for several research papers or long-form articles. Results identify matching sources with highlighted passages and similarity percentages. For students submitting academic work, content writers producing SEO articles that need to be original, and professionals writing reports that will be published or distributed, the plagiarism checker provides a layer of verification before submission. The 25,000-word monthly cap means heavy users producing multiple long documents regularly may exhaust their allowance — it's worth tracking usage on content-heavy months.

Citation Generator — APA, MLA, Chicago, and More

QuillBot's Citation Generator produces formatted academic citations automatically from URLs, book titles, journal articles, or manual inputs. It supports APA, MLA, Chicago, and other major citation formats used in academic writing. You enter the source — paste a URL, type a book title, or input details manually — and the tool generates a correctly formatted citation ready to paste into a reference list. For students managing bibliographies across multiple assignments, this saves significant time and reduces the formatting errors that cost marks on academic submissions. The Citation Generator is available on the free plan with no usage restrictions, making it one of the most accessible tools in the QuillBot suite.

PDF and File Tools — A Full Document Suite

QuillBot has expanded significantly into document management tools that go well beyond writing assistance. The PDF suite covers editing, merging, splitting, rotating, page extraction, deletion, compression, protection, cropping, and conversion between PDF and Word, Excel, PowerPoint, JPG, and PNG formats. ChatPDF lets you upload any PDF and ask questions about its content — useful for quickly extracting information from research papers, contracts, or reports without reading the entire document. File converter tools handle Word, Excel, and PowerPoint conversions in both directions. For users who previously juggled multiple tools for document management, having these capabilities inside the same subscription that covers writing assistance represents meaningful consolidation — particularly for students and professionals who work with documents regularly.

Pricing

Free — $0/month
No credit card or sign-up required for most tools. Paraphraser limited to 125 words per request, 2 paraphrasing modes (Standard and Fluency), Summarizer up to 1,200 words, basic Grammar Checker. No plagiarism checker on free plan.

Premium — $8.33/month (billed annually at $99.95/year; $9.95/month billed monthly)
Unlimited paraphrasing with no word limit, all 7 paraphrasing modes including Academic, Creative, and Custom, Freeze Words feature, unlimited Grammar Checker, Plagiarism Checker (25,000 words/month), AI Humanizer, AI Detector, Summarizer with higher limits, Tone Checker, all PDF and image tools, faster processing speed.

Student — $6.25/month (billed annually at $74.95/year)
All Premium features at a 25% discount for verified students. Same feature set as Premium.

Teams — from $7.50/user/month (for 2–10 seats, billed annually)
All Premium features plus shared style guides, admin controls, centralized billing, and team management. Discounts apply at 5+ members.

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Pros & Cons

Pros
  • 35 million+ users and 4.9/5 on Trustpilot — one of the most trusted writing tools available
  • Most comprehensive free paraphrasing tool in the category — no sign-up required for basic use
  • Premium at $8.33/month (annual) is significantly cheaper than Grammarly ($12/month) and Wordtune ($13.99/month)
  • 7 paraphrasing modes covering academic, creative, formal, and custom styles
  • Student discount plan available at $6.25/month annually — 25% cheaper than standard Premium
  • Available across every major browser, OS, and device including Chrome, Edge, Safari, Word, iOS, Android, macOS, and Windows
  • Plagiarism checker, AI detector, and citation generator all included in Premium
  • The tool suite has expanded well beyond writing — PDF tools, image tools, and file converters make it a genuine productivity hub
Cons
  • Free plan paraphraser limited to 125 words per request — becomes frustrating quickly for longer documents
  • Plagiarism checker capped at 25,000 words/month on Premium — heavy users may hit this limit
  • AI Humanizer quality is inconsistent — not reliable enough for high-stakes academic submission
  • No long-form content generation from scratch — QuillBot rewrites and improves existing text, it doesn't generate original articles from a prompt
  • Teams plan pricing requires contacting sales for larger groups
  • The sheer number of tools can feel overwhelming — the product has expanded significantly from its paraphrasing roots

Frequently Asked Questions

Is QuillBot free to use?
QuillBot has a genuinely useful free plan that requires no credit card and no sign-up for basic tool access. The paraphraser, grammar checker, summarizer, translator, and citation generator are all available free with usage limits. The main restriction that drives most users to upgrade is the 125-word limit on the paraphraser — enough for a paragraph, but not a full document. Premium at $8.33/month (billed annually at $99.95/year) removes these limits entirely and unlocks all 7 paraphrasing modes, unlimited plagiarism checking up to 25,000 words/month, the AI Humanizer, and all Premium features. A student discount plan is available at $6.25/month annually for verified students.
How does QuillBot compare to Grammarly?
QuillBot and Grammarly solve different primary problems. Grammarly is the stronger grammar and style checker — it provides deeper analysis of tone, clarity, engagement, and delivery, and integrates more deeply with professional writing workflows. QuillBot is the stronger paraphrasing and rewriting tool — it excels at reformulating existing text in different styles, which is particularly valuable for academic writing, content repurposing, and ESL users. QuillBot is also significantly cheaper at $8.33/month versus Grammarly's $12/month annually. For users who primarily need to rewrite, rephrase, or paraphrase — rather than analyze writing style — QuillBot is the better fit and the better value.
Can QuillBot detect AI-generated content?
Yes. QuillBot includes an AI Detector that can identify AI-generated text, and a separate AI Image Detector for identifying AI-generated images. The AI Detector is available on the free plan with limited usage and on Premium with expanded access. For academic submissions or content that needs to pass AI detection, QuillBot also offers an AI Humanizer — a tool that rewrites AI-generated text to read more naturally and reduce detectable AI patterns. The effectiveness of AI humanization tools varies depending on the detector used, and no humanizer guarantees consistent results across all detection systems.

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