無料AI文法チェッカー（サインアップ不要） - QuillBot

Free AI Grammar Checker (no sign-up required) - QuillBot AI Grammar Checker New Projects Paraphraser Grammar Checker AI Detector Plagiarism Checker AI Humanizer AI Chat AI Image Generator Translate Summarizer Citation Generator New Projects Paraphraser Grammar Checker AI Detector Plagiarism Checker AI Humanizer AI Chat AI Image Generator Translate Summarizer Citation Generator New Projects Paraphraser Grammar Checker AI Detector Plagiarism Checker AI Humanizer AI Chat AI Image Generator Translate Summarizer Citation Generator QuillBot for Chrome Grammar check for free! Paste your text in the grammar checker and hit the button to fix all grammar, spelling, and punctuation errors using cutting-edge AI technology. Free grammar checker Paste or enter your text below to get an instant grammar check. English (US) Writing task Check grammar Grammar Checker QuillBot’s AI-powered Grammar Checker helps you write with clarity, confidence, and accuracy. Our tools go beyond grammar, offering in-line support real-time suggestions intelligent writing feedback powered by QuillBot’s AI. AI-powered Improve content clarity with AI Comprehensive Fix grammar, spelling, punctuation, and more Multidialectal Detect and fix errors across different dialects Multilingual Correct grammar in 6+ different languages 100% free Run unlimited grammar checks at no cost AI-powered Get fast, accurate, and helpful corrections Comprehensive Fix grammar, spelling, punctuation, and more Multidialectal Detect and fix errors across different dialects Multilingual Correct grammar in 6+ languages 100% free Run unlimited grammar checks at no cost How to use QuillBot’s AI grammar checker 1 Enter your text Paste or upload your text into the Grammar Checker. 2 Refine your writing Evaluate QuillBot’s grammar, punctuation, and fluency suggestions. 3 Update and share Accept corrections or use AI-powered commands to rewrite, expand, or simplify your sentences. Integrations Check your grammar wherever you go Use the QuillBot extension to check grammar directly in ChatGPT, Gemini, and other LLMs. One of Google's favorite extensions 4.7 /5 6M+ users Add to Chrome. It’s free! Word add-in Also available on For additional details, read more . One Grammar Checker to rule them all Correct grammar Should you use “effect” or “affect” ? What’s the difference between “their,” “there,” and “they’re”? There’s so much to remember when it comes to proper grammar, no matter what language you speak. Luckily, QuillBot has your back with the best online grammar checker out there—and it’s free! Fix spelling QuillBot corrects both misspelled and misused words, so you’ll never have to worry about pesky spelling rules or the differences between homophones again. With our free online spell check , spelling errors are a thing of the past. Your writing will be polished and professional from here on out. Correct punctuation What’s a comma splice? When should you use a semicolon? Does a comma belong there? Even spelling and grammar sticklers can have a tough time following punctuation rules, so it’s a good thing QuillBot’s AI Grammar Checker doubles as a punctuation checker . By using QuillBot for Chrome , you can save your brainpower for articulating your ideas since you’ll have correct punctuation all figured out, wherever you write. Fix grammatical errors with just one click We care that your workflow is streamlined, which is why we rolled three tools into one with our cutting-edge Grammar Checker. It provides a reliable sentence check for grammar, spelling, and punctuation. QuillBot will grammar check sentences from the beginning to the end of any project you’re working on with one simple click, making sure that your work is eloquent and error-free. Going beyond grammar QuillBot offers more than corrections alone. Our AI evaluates clarity, fluency, and engagement so you can sound your best. Clarity and fluency fixes Make your sentences flow naturally and sound more professional, improving readability and tone. If you're using AI-generated drafts, try Humanize AI to turn robotic text into natural, human-sounding writing. Tone and style suggestions Write confidently in any style. Adjust tone and delivery with AI suggestions tailored to your purpose, whether that’s a professional report, a creative story, or an academic essay. Smart writing recommendations Reduce wordiness, avoid clichés, or rewrite unclear phrases, with QuillBot’s Grammar Checker AI Chat and AI detection Use AI chat for personalized writing feedback and our built-in AI detector to identify AI-generated content directly within the Grammar Checker tool. Simplify your writing workflow Good communication shouldn’t require multiple tools or open tabs. QuillBot has AI-based writing tools for paraphrasing , summarizing , grammar checking, Humanize AI and more. Our contextual AI commands let you generate new ideas, simplify complex statements, and rewrite in different styles directly within Grammar Checker online, without switching tabs. Below are examples of grammar, spelling, and punctuation errors that QuillBot’s Grammar Checker will identify and help you understand how to fix. Topic Wrong Right Subject-verb agreement My mom like pizza and tacos. My mom likes pizza and tacos. Word misuse The affect of this change is unclear. The effect of this change is unclear. Comma splices First I went to the grocery store, then I went to the library. First I went to the grocery store, and then I went to the library. Singular vs. plural nouns Four pets found new home today. Four pets found new homes today. Consecutive nouns I need to go to the instruments repair shop. I need to go to the instrument repair shop. Possessive plural nouns You need both of your parent’s permission. You need both of your parents’ permission. Unnecessary prepositions Come to here. Come here. But this free grammar check goes further. It takes a holistic view of your writing to help you communicate more fluently, concisely, and clearly. If you need to boost readability or simplify an overly complex statement, it’s just the tool for you. Turn a grammar check into a learning experience When Grammar Checker flags mistakes in your writing, it visually models these issues, helping you learn and grow into a better writer. “That’s how you spell ‘receipt’? I’ve been spelling it wrong forever!” “I guess I do need a conjunction between these two phrases separated by a comma. I understand comma splices now!” QuillBot helps you build stronger writing habits over time. Each correction now contributes to a writing score that measures fluency, clarity, engagement, and delivery, so you can continuously track and improve overall writing quality. QuillBot has what you need QuillBot offers you top-notch tools for perfecting your writing, from our Paraphraser and Summarizer to our Plagiarism Checker . We even help with any English variant you’re writing in, whether it’s UK, US, Australian, or Canadian. But the fun doesn’t stop with English. Now you can use Grammar Checker to guarantee your text is error-free in German , French , Spanish , Brazilian Portuguese , Swiss German, and Dutch. After all, perfect prose is a global goal. At QuillBot , we’re committed to making writing painless by building the most robust writing and research platform in the world. Backed by AI technology, our models are more dynamic than those of any other tools on the market, and we’re always looking to improve our users’ experience and workflow. What other tools would be helpful to you? We want to hear from you Featured in Why writers love us QuillBot Grammar Checker FAQs Below are some of the most frequently asked questions with regard to Grammar Checker. What is grammar? Grammar is the set of rules that shape how we organize words to make meaningful sentences. Correct grammar helps ensure your writing is clear, coherent, and impactful. What’s new in QuillBot’s Grammar Checker? The Grammar Checker now goes a step further to help improve your writing style, fluency, and tone. You can still use it to check grammar, but now the tool does even more. When you grammar check online, you’ll receive detailed feedback on clarity, engagement, and sentence flow—plus access to rewriting tools and contextual AI commands that adapt to your writing task, whether academic, creative, or professional. AI Chat and AI Detection are now available as part of the experience. Why is QuillBot Grammar Checker better than other editing tools? There are many reasons, but we’ll try to keep it short: QuillBot’s Grammar Checker reviews your writing for both simple and complex errors, suggesting necessary changes. It considers your writing’s meaning and context, so you can fix your grammar while keeping tone and clarity consistent. Our tool also offers real-time writing feedback, with integrated paraphrasing and rewriting tools. Plus, it works seamlessly across multiple browsers, Word, and macOS. So no matter where you’re working, our tool helps you grammar check online. Who can use QuillBot's Grammar Checker? Anyone can use QuillBot’s Grammar Checker. It’s ideal for professionals, ensuring their work is error-free; students checking assignments before submission; and language learners improving fluency and accuracy. QuillBot supports English grammar checks, as well as other languages, including German, French, Spanish, Brazilian Portuguese, Swiss German, and Dutch. Can this tool be used as a spell checker? Absolutely! Our Grammar Checker doubles as a spell check tool to ensure that every part of every sentence you write is correct. It can be hard to keep track of all the moving parts of a writing project, but now you can cross correct spelling off that list—we’ve got it covered. Can this tool be used as a punctuation checker? Yes, Grammar Checker also works as a punctuation checker, identifying and fixing misplaced commas, missing semicolons, and more, so your sentences are always clear and polished. Grammar is vital when communicating eff