QuillBot

An all-in-one AI writing suite covering paraphrasing, grammar checking, plagiarism detection, AI detection, AI Humanizer, translation, and summarization. Its Chrome extension is free, and the official site reports more than 6 million users.

AI Text Tools#Rewriting#Text Polishing#Grammar

Updated: 2026-10-26

What is QuillBot?

QuillBot's official positioning has expanded from a "paraphrasing tool" to a comprehensive AI writing suite, with the slogan "Your only AI subscription you'll ever need." It integrates paraphrasing, grammar checking, plagiarism detection, AI detection, translation, summarization, citation generation, and even image generation into a single product, emphasizing multi-scenario capabilities of "write, design, create" and covering the entire workflow from idea conception to final draft. Its Chrome extension is available for free, and the company states it has over 6 million users, making it convenient for quick in-browser access. The entire suite operates on a unified subscription model, eliminating the need to pay repeatedly for individual features, making it ideal for users who prefer centralized management of their writing tools.

Who is it for?

Students, academic writers, and professionals in the workplace who need to write in English, especially those revising papers, writing emails, conducting literature reviews, and creating social media content; multilingual users who need to process English texts can also use the translation and rewriting functions to complete daily expressions, with a relatively wide coverage. Users such as entrepreneurs and job seekers who need to efficiently produce resumes and promotional materials can also directly benefit.

Key features

Paraphraser

Multiple paraphrasing modes that adjust expressions without changing the original meaning. Ideal for making writing smoother and more authentic, it is the most frequently used core feature and also supports adjusting the tone to be formal or casual. During paraphrasing, you can control the replacement intensity, choosing from light polishing to complete rewriting as needed. Combined with grammar checking, it can complete polishing and error correction in one go.

Grammar Checker

Real-time error correction during the writing process, covering spelling, grammar and punctuation issues, suitable for daily proofreading in English writing scenarios.

Plagiarism and AI Detection

Built-in Plagiarism Checker and AI Detector, which provide references for content review and originality checks, covering the compliance requirements of content release.

AI Humanizer

Rewrites AI-generated text to sound more like human writing, with an official emphasis on "authentic" creative expression, suitable for scenarios where you need to reduce the robotic feel and pursue a natural tone.

AI Chat & Tone Analysis

AI Chat allows you to have conversations with AI around writing tasks to get ideas and material suggestions; tone analysis helps evaluate the tone and fluency of the text, making expressions more professional or natural.

Summary, Translation and Citation Generation

Summarizer condenses long texts, Translate handles cross-lingual processing, and Citation Generator generates reference formats, covering the common needs of literature reviews and data organization.

Chrome Extension

The official platform states that it has over 6 million users. It is available anywhere for free and can be directly activated in email, document, and web page input boxes, with low usage costs.

How to use QuillBot

The free version has usage and word count limits.
For high-frequency use, you need to subscribe to Premium.
Common combinations are "Rewrite first then Grammar Check" or "AI Detection first then Humanizer", but all test results are for reference only and do not serve as the final basis.
For academic scenarios, please refer to the specific requirements of your school or journal.
The thresholds for plagiarism check and AI detection vary by platform, and it is recommended to use multiple tools for cross-verification of important content.
You can also compare the rewritten result with the original text sentence by sentence to ensure that the original meaning is not changed.
The length of text processed in a single operation is limited, and ultra-long documents need to be processed in sections.

Things to know

The free version has obvious limits (such as the daily number of rewrites and the upper limit of words processed in a single time), and the annual subscription price is usually more cost-effective. AI Humanizer may violate the school's AI usage regulations in academic scenarios, so please confirm the rules before using it. The uploaded content will be processed through its servers, so you need to evaluate the privacy risks when involving unpublished papers or confidential documents.