QuillBot — Paraphrasing and grammar toolkit used by students worldwide
What it is
QuillBot is the paraphrasing and grammar toolkit used by students worldwide - 10+ modes, custom modes, plagiarism checker, AI detector and humanizer with Word and Chrome integration. Free paraphrases 100 words in 2 modes; Premium is $8.33 a month billed annually. Over-reliance flattens voice, and paraphrased output can still flag as AI-generated in institutional detectors.
Editor's review
Long-form introduction by the BetterPicker editors · checked against the official site · Oct 20, 2026
QuillBot is the paraphrasing toolkit an entire generation of students defaults to, and it has quietly grown into a full writing-integrity suite: paraphraser, grammar checker, plagiarism checker, AI detector and an AI humanizer, all in one subscription with Word and Chrome integration. The free tier paraphrases a hundred words in two modes - enough to feel the engine - and Premium at $8.33 a month billed annually removes the caps and adds the full detector and humanizer. The reviewer's caution is the honest counterweight: in a live Turnitin test, text paraphrased by these tools flagged as fully AI-generated. Paraphrase is not authorship, and institutions increasingly check for it - QuillBot is best read as a polishing instrument, not a ghostwriter. The suite grew because its users asked for it: first paraphrase, then grammar, then the detectors that judge what paraphrase produces.
What it does well
Paraphrase depth with modes that mean something: more than ten modes run from Academic to Simple, custom modes let you define a voice of your own, and the reviewer's workflow shows sentence-level rewrites that preserve meaning while changing structure. Meaning survives the rewrite, which is the bar a thesaurus fails, and the modes change register rather than just swapping synonyms.
An integrity stack that answers its own problem: the plagiarism checker scans against missed citations in over a hundred languages, the AI detector reads like the tools institutions use, and the humanizer rewrites machine-flavored text into something that reads human. Whether that stack should need to exist is a fair question, but as a description of the product it is accurate.
Integration where writing happens: the Chrome extension and Word add-in put paraphrase, grammar and summaries inside the document instead of a separate tab, which is why it sticks as a daily tool rather than an occasional visit. The extension works in Gmail, Docs and across the web, so the tool meets the draft where it lives.
Who it's for
Students polishing papers, non-native writers smoothing tone, editors doing a second pass on translated text, and content creators who need a second pass on drafts without a full rewriting platform.
Where it falls short
Detection is the elephant: the reviewer's Turnitin runs flagged paraphrased output as AI-generated, so submitting rewritten text as original writing is a real risk, not a theoretical one.
Over-reliance flattens voice: lean on the paraphraser long enough and every draft sounds the same - the tool polishes, it does not author.
The free tier is a sample: a hundred words and two modes per run push serious users to Premium, the best modes sit behind the paywall, and the word caps reset per run rather than per day.
Specs at a glance
Facts from the official site · not editorial opinion
| What it is | Paraphrasing and grammar toolkit with plagiarism checker, AI detector, AI humanizer and summarizer, plus Word and Chrome integration |
|---|---|
| Price | Free $0; Premium $8.33/mo billed annually (58% off monthly rate); Team plan with usage metrics, user management and centralized billing |
| Free tier | Paraphrase up to 100 words in 2 modes, basic grammar fixes, humanize up to 100 words (limited), basic summaries, limited AI detector |
| Premium | Full paraphrasing with unlimited modes, advanced grammar recommendations, full humanizer, custom summaries, full AI detector, plagiarism prevention |
| Modes | 10+ paraphrasing modes from Academic to Simple, plus custom modes you define yourself |
| Plagiarism | Plagiarism Checker analyzes papers in seconds and identifies missed citations in 100+ languages |
| Scale | Trusted by over 35 million writers worldwide |
Frequently asked questions
▸Is QuillBot free?
There is a real free tier: paraphrase up to 100 words in two modes, basic grammar fixes and limited AI detection. Premium at $8.33 a month billed annually removes the caps and opens all modes, the full humanizer and the plagiarism checker.
▸Can QuillBot beat AI detectors?
No tool can promise that, and the reviewer's Turnitin test flagged paraphrased text as AI-generated. Treat the humanizer as a polishing pass, not a way to submit machine-written work as your own.
▸What does Premium add over free?
Unlimited paraphrase length and modes, advanced grammar recommendations, full humanizer access, custom summaries, full AI detector and plagiarism prevention.
▸Does QuillBot work inside Word or Chrome?
Yes. A Chrome extension and a Word add-in bring paraphrasing, grammar and summaries directly into the document you are writing in.
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