QuillBot
Freemium Editor's pickAI writing suite: Paraphraser, AI Humanizer, AI Detector & Flow editor — one workspace
⚡ Quick Verdict
Anyone editing AI-generated text, students paraphrasing sources, ESL writers, content teams rewriting at scale
Generating long-form content from scratch (use ChatGPT or Claude first, then QuillBot)
Free tier (incl. AI Detector) · Premium from $4.17/mo (annual)
Yes — incl. unlimited AI Detector
4 tools in one suite: Paraphraser + Humanizer + Detector + Flow
Free Humanizer is capped (~125 words/run)
Bottom line: QuillBot scores 4.6/5 and is our top pick for editing, rewriting, and humanizing AI-generated text. The free tier is unusually generous (AI Detector is fully free), and Premium at $4.17/mo is the best value in the writing-tool category — cheaper than Grammarly Premium ($12), Jasper ($49), or Wordtune ($9.99) while bundling 4 useful tools.
What is QuillBot?
QuillBot started in 2017 as a single paraphrasing tool and has grown into a four-tool AI writing suite used by 50M+ students, researchers, ESL writers, and content teams. The four products are tightly integrated: paste text once and you can paraphrase it, humanize it (so it passes AI detection), check whether the original was AI-generated, or rewrite it in QuillBot's full Flow editor without switching tools.
In testing on April 2026, we ran 60+ paragraphs of ChatGPT-generated text through QuillBot's pipeline. The AI Detector flagged 100% as AI; after running the Humanizer in Advanced mode, the same text scored 0% AI on QuillBot's own detector and dropped below detection thresholds on GPTZero and Originality.AI in most cases. The Paraphraser's Humanize mode shows changed words inline so you can verify edits before accepting them — a level of transparency competitors like Wordtune and Jasper don't match.
Beyond the four main tools, the platform bundles a grammar checker, summarizer, citation generator (APA, MLA, Chicago, Harvard, IEEE), plagiarism checker comparing text against billions of web sources, and translation in 45+ languages. Native integrations cover Google Docs, Microsoft Word, Chrome, Edge, macOS, iOS, and Android — so you can write and polish text without leaving the document you're already in.
Free tier includes basic paraphrasing (125-word limit per run), full AI Detector access, Humanizer with daily caps, grammar checker, and summarizer. Premium at $4.17/mo (annual) or $9.95/mo (monthly) removes word limits across every tool, unlocks all 9+ paraphrase modes including custom tones, adds plagiarism detection, full Humanizer access, and priority processing.
QuillBot's 4 main tools
Each tool has its own free entry-point. Start with the one that solves your problem today — your account works across all four.
QuillBot Paraphraser
Rewrites any text in 9+ modes: Standard, Fluency, Humanize, Formal, Academic, Simple, Creative, Expand, Shorten, plus custom tones like "Like a TikTok influencer" or "Like technical writing". A side-by-side Compare Modes view shows changed words, structural changes, and longest unchanged spans — useful when you need to verify the rewrite preserved your meaning.
Best for: Paraphrasing source material in academic writing · rewriting AI-generated drafts to sound like your voice · adjusting tone for different platforms · ESL writers polishing English prose.
QuillBot AI Humanizer
Takes AI-generated text (ChatGPT, Claude, Gemini, etc.) and rewrites it to sound natural and human-written — varied sentence length, idiomatic phrasing, less repetitive structure. Two modes: Basic (light edits, preserves voice) and Advanced (stronger rewrite, higher humanization). The interface shows Sentence count, Word count, Character count, Percent change, and Longest unchanged words, so you can see exactly how aggressive the rewrite was.
Best for: Content marketers who need AI-assisted writing that doesn't trigger AI detectors · students checking AI assignments before submission · anyone whose published writing needs to feel human.
QuillBot AI Detector
Pastes any text and scores it across four labels: AI-generated, AI-generated & AI-refined, Human-written & AI-refined, and Human-written. Supports English, French, Spanish, German, and Dutch. Free, unlimited, no sign-up required. Generates a downloadable PDF report — handy for teachers verifying student work or editors auditing freelancer submissions.
Best for: Teachers screening assignments · editors checking submissions · content managers auditing freelancer work · writers self-checking before publishing.
QuillBot Flow
QuillBot's all-in-one AI writing editor — closer to Notion AI or Microsoft Editor than a paraphrasing widget. Generates content from a prompt, edits inline, rewrites sections in any mode (formal, humanize, expand), checks grammar, and runs Detector/Humanizer in the same window. Designed for long-form work where you'd otherwise jump between ChatGPT, Grammarly, and a paraphraser.
Best for: Long-form drafting (essays, blog posts, reports) where you want generation + editing + humanization in one place · users who currently bounce between 3+ writing tools.
QuillBot Pricing (verified April 2026)
Paraphraser (125 words / Standard + Fluency only) · Grammar checker · Summarizer · AI Detector unlimited · Humanizer (daily-capped)
All 9+ paraphrase modes & tones · Unlimited word count · Full Humanizer (Advanced mode) · Plagiarism checker · AI Detector · Flow editor · Priority processing
How it compares: Grammarly Premium is $12/mo (3× more), Jasper starts at $49/mo (12× more), Wordtune Premium is $9.99/mo (2.4× more). For the breadth of tools included, QuillBot Premium is the best value in this category. View current QuillBot pricing →
Key Features
- Paraphraser with 9+ modes (Standard, Fluency, Humanize, Formal, Academic, Simple, Creative, Expand, Shorten) + custom tones
- AI Humanizer (Basic + Advanced modes; shows changed words inline)
- AI Detector — 4 categories, multi-language, free unlimited, PDF report
- Flow — all-in-one AI writing editor (generate + edit + humanize)
- Grammar checker with real-time inline suggestions
- Summarizer (key sentences or paragraph form)
- Citation generator (APA, MLA, Chicago, Harvard, IEEE)
- Plagiarism checker against billions of web sources
- Translator — 45+ languages
- Chrome / Edge / Safari / Firefox extensions
- Google Docs & Microsoft Word add-ins
- macOS desktop app + iOS / Android mobile apps
Pros & Cons
Pros
- 4 tools in one suite — replaces multiple subscriptions
- Best price/feature ratio (Premium $4.17/mo)
- AI Detector is fully free, no signup, unlimited use
- Humanizer Advanced mode passes most AI detectors in testing
- Native integrations with Google Docs, Word, Chrome
- Multi-language support (paraphraser + detector)
- Transparent UI — shows what changed before you accept it
Cons
- Free tier word limits feel tight after a few uses
- Not a full content generator like ChatGPT / Jasper
- Aggressive paraphrasing can shift meaning — always review output
- Grammar checker is good but Grammarly Premium edges it for nuance
- Some universities ban AI-paraphrased work — check your policy
Who QuillBot is best for
Generate with ChatGPT → run Humanizer → publish AI-assisted writing that doesn't trip detectors.
Paraphrase sources, generate citations, check plagiarism, polish ESL prose.
Free AI Detector for screening submissions — unlimited and no signup.
One tool replaces paraphraser + humanizer + detector + grammar subs.
📋 Good to know
Visit quillbot.com and paste text to paraphrase, or install the browser extension for in-place rewriting. No account needed for basic use.
Text is sent to QuillBot's servers for processing. The platform does not store your text permanently. Premium users can disable data collection.
When you need more than 125 words per paraphrase, want unlimited modes (formal, creative, etc.), or need the plagiarism checker and AI detector (Premium at $8.33/mo).
Very low — paste text and click paraphrase. Switching between modes (fluency, formal, creative) is one click. The Grammar Checker works like Grammarly.
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What is QuillBot, exactly?
QuillBot is a four-tool AI writing suite: the Paraphraser (rewrites text in 9+ modes), the AI Humanizer (converts AI text to natural prose), the AI Detector (scores text as AI vs. human), and Flow (all-in-one writing editor). Plus grammar checking, summarizing, citations, plagiarism detection, and translation. Used by 50M+ writers globally.
Is QuillBot free?
Yes — and the free tier is unusually generous for this category. The AI Detector is fully free with no word limit. Free Paraphraser has a 125-word limit per run and Standard + Fluency modes only. Free Humanizer is daily-capped. Premium ($4.17/mo annual) removes all word limits, unlocks every mode and tone, adds plagiarism checking and the full Humanizer.
Does QuillBot's Humanizer actually bypass AI detectors?
In our April 2026 testing across 60 paragraphs of ChatGPT-4 output: Advanced mode dropped detection scores from ~95-100% AI to below detection thresholds on QuillBot's own detector, GPTZero, and Originality.AI in 80%+ of cases. Basic mode is more conservative — useful when you want to keep more of the original voice. Note: detection tools are an arms race; no humanizer can guarantee 100% pass on every detector forever. Always read the output before publishing.
QuillBot vs Grammarly — which should I use?
Different tools, complementary. Grammarly is better for real-time grammar and style checking as you type ($12/mo Premium). QuillBot is better for rewriting, paraphrasing, and humanizing AI text ($4.17/mo Premium — about a third the price). Many writers use both: Grammarly catches errors as you write, QuillBot rewrites sections that need different tone or need to pass AI detection. See our full QuillBot vs Grammarly comparison.
QuillBot vs ChatGPT — when do I use which?
Use ChatGPT (or Claude) to generate first drafts. Use QuillBot to edit, paraphrase, and humanize what AI produced. ChatGPT is a generator; QuillBot is a polish layer. The two work together — generate with one, refine with the other. See our ChatGPT vs QuillBot comparison for specifics.
Is QuillBot good for academic writing?
Yes — QuillBot is one of the most-used tools in academia. The Paraphraser's Academic mode rewrites in formal scholarly tone. The citation generator supports APA, MLA, Chicago, Harvard, IEEE. The plagiarism checker compares against billions of web sources. Important caveat: many universities require original work and ban AI-assisted paraphrasing. Check your institution's policy. QuillBot is a tool — how you use it determines whether it's appropriate.
Does QuillBot work with Google Docs and Word?
Yes. Native add-ins for Google Docs and Microsoft Word, plus browser extensions for Chrome, Edge, Safari, Firefox. macOS desktop app and iOS/Android apps cover offline writing. The Chrome extension works inside Gmail, Outlook web, LinkedIn, Notion, and most web-based editors — paraphrase or check grammar without leaving the page.
What languages does QuillBot support?
Paraphraser: English (US/UK/CA/AU), French, German, Spanish. AI Detector: English, French, Spanish, German, Dutch. Translator: 45+ languages. Grammar checker: English only. For non-English paraphrasing at quality, QuillBot leads — competitors like Wordtune are English-only.
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