Best Online Grammar Checkers

Whether you need to submit an essay at college or publish a blog post online, checking grammar is crucial to avoid mistakes. Content writing professionals understand the importance of professionally edited and thoroughly checked content. Due to the variety of dedicated tools, it’s now easier than before to check every text and ensure it does not have any spelling issues or stylistic problems. In this guide, we will review the 10 best online grammar checkers available today and consider the advantages and shortcomings of these services.

Why Use Online Grammar Checkers?

Academic papers, scholarly essays, marketing copies, and blog posts should be written in a clear, easy-to-understand tone of voice. Moreover, they should be free from any grammatical mistakes. While many programs feature built-in grammar checkers, they have limited capabilities and may fail to perceive linguistic nuances correctly. Using advanced online grammar checkers will help you give your texts a professional feel.

Web-based grammar checkers identify spelling and punctuation errors, provide useful suggestions, and generate recommendations regarding sentence structure. Here are the main reasons to use them:

• High accuracy. Some services detect 100% of mistakes.
• Automation. AI-powered tools are trained on large datasets and can process large volumes of documents with ease.
• Quick results. There is no need to spend hours rereading a text, as an online grammar checker will instantly highlight problematic sentences.
• Accessibility. Online checkers can be accessed from any device on the go.

As not all tools deliver a consistent performance, explore the options reviewed in this guide to discover the services known for their reliability.

Best Free Online Grammar Checkers

An advanced grammar checker is built to scrutinize texts uploaded by users and detect grammatical issues, problems with punctuation, and potential areas for style improvement. We decided to thoroughly test the popular web-based grammar checkers available free of charge. When assessing these tools, we examined their ability to offer quick corrections, recognize context, and deliver a consistent performance. 

Grammarly

Pros:

• Intuitive interface with a clear layout;
• Unlimited grammar checks in the free version;
• AI-powered writing assistance tools;
• An accurate text score to assess writing quality.

Cons:

• Requires registration.
• Limited Pro suggestions in the free version.

This platform is considered the best online grammar checker available today, as it offers the whole range of services, from plagiarism to AI checkers. Grammarly provides helpful review suggestions to improve the clarity of a text and make it more engaging. Users can specify the type of their audience (general, knowledgeable, or expert), adjust the formality level, and specify intent. 

The free version supports unlimited grammar checks. However, it allows users to benefit only from 2 Pro suggestions per day. Grammarly offers helpful assistance to those who want to keep their texts mistake-free and use style recommendations to elevate their writing skills. 

After creating an account, users get access to the following free tools available on the Grammarly platform:

• Built-in spelling and punctuation checkers;
• AI-based grammar checker;
• Personal dictionary;
• Browser extension.

Unlike basic grammar checkers, this service thoroughly analyzes the text uploaded by a user and makes helpful suggestions. Using this platform, you can improve your writing style and understand how stylistic choices impact the quality of the text.

Grammarly has a convenient browser extension, which facilitates checking text uploaded to Google Docs and other online platforms. What makes this service stand out among other free tools is that it offers useful recommendations that enable users to elevate their writing skills.

LanguageTool

Pros:

• Accurate corrections;
• A browser add-on;
• 3 daily paraphrasing suggestions.

Cons:

• Style suggestions are not available in the free version.
• Detects fewer mistakes than more powerful tools.

This service stands out for its streamlined interface. It’s extremely easy to navigate and allows users to check texts in different languages. The service automatically detects the language of a text. The built-in grammar checker is quite accurate and detects many grammar mistakes and spelling errors. However, it occasionally has difficulties with recognizing passive voice.

Users can access the platform from any browser, on desktop and mobile devices. It integrates with Microsoft Word, Google Docs, and other programs and services. The community released helpful plugins that allow users to streamline their writing workflows. Users can find any information they need on the forum. 

All in all, Language Tool is a helpful service with multi-language support that will appeal to users who need to create content for foreign markets. However, it has fewer features than Grammarly.

Originality.ai

Pros:

• Detects 100% of grammar mistakes;
• Advanced AI tools;
• Quick performance;
• Intuitive UI.

Cons:

• Only 3 grammar and spelling suggestions in the free version.
• Requires signing up.

Although the platform was designed to detect AI-generated content, it also features an advanced AI-driven grammar and spell checker. It’s used by agencies and professional writers who need to improve the quality of their text subtly. This service detects grammar errors with 100% accuracy and has a more streamlined interface than other similar online checkers. 

Users can fix grammar errors in one click. Additionally, the platform features fact-checking tools and dedicated content optimization tools.

GrammarCheck

Pros:

• Streamlined functionality;
• Advanced grammar tools;
• Transparent terms of use.

Cons:

• No plagiarism checker;
• Accuracy issues;
• No detailed reports.

This service was designed for those who want to check their text quickly. Users need to copy and paste their text into the online editor. It will be analyzed in a fraction of a second. The service highlights grammar issues and has a “Deep Check” option for those who want to eliminate advanced grammar mistakes.

GrammarCheck detects grammar, spelling, and punctuation mistakes. A user can click an underlined word or sentence to change it. However, some users complain that the free version’s functionality is rather limited. The Deep Check feature enables users to get suggestions regarding better wording, dangling modifiers, stylistic inconsistencies, and other issues.

The developers use AI responsibly and deploy only secure algorithms. The service does not require registration and allows users to access a thesaurus. Users can access writing stats to check reading times. Moreover, they can change keyword density to make their texts easier to read.

Wordtune

Pros:

• A web version and an add-on;
• Free grammar checking tool;
• Easy-to-navigate interface;
• Decent accuracy.

Cons:

• Requires registration.
• Limited AI suggestions in the free version.

This intuitive web-based tool is the perfect option for those who want to quickly edit their texts and eliminate grammar mistakes for free. It has a web version and a Chrome extension. After clicking the “Get Wordtune for free” button on the official website, a user is redirected to the sign-up page. Then, clients are invited to register with their email. 

The free version allows users to get 10 rewrites and AI suggestions daily. Moreover, they can use AI summarization services three times per month. Clients have unlimited access to grammar checks and spelling corrections.

Best Paid Online Grammar Checkers

If you aren’t on a budget and often need to edit long papers and marketing copies, be sure to use premium services to check high volumes of text for grammar mistakes with high accuracy. These platforms stand out for their reliability, consistent performance, and high accuracy, making them especially suitable for those who need to give their content a professional feel.

ProWritingAid

Pros:

• Allows saving formatting templates.
• Advanced grammar checker.
• A choice of creative writing tools.

Cons:

• Cluttered interface.
• Reports are difficult to understand.

Professionals looking for advanced creative writing tools often use this service, as it is similar to Grammarly in terms of functionality but offers more detailed reports. Using it, you can assess the readability of your texts with ease. 

While the interface may seem a bit convoluted at first, and a user may find it difficult to interpret reports, ProWritingAid offers advanced suggestions and highlights issues that other services may miss. For instance, it is known for its punctuation checking tools.

ProWritingAid is best suited for those who specialize in creative writing. Users can access the Pacing report and check whether there are many redundant words in their texts. Besides the built-in grammar checker, you can use other tools that will help you improve the structure of your text and ensure that it has a consistent style. Chapter Critique and Manuscript Analysis tools offer more advanced insights.

The premium version of this service enables users to develop and save their custom style guide, ensuring their content is written in a consistent voice and adheres to uniform formatting. With the help of the Rephrase tool, users can rewrite their sentences using the AI Sparks feature. 

ProWritingAid has versions for Windows and macOS devices. Users can also install Microsoft Word and Google Docs add-ons. The service safeguards user data. The premium version costs $10 per month. It allows users to check their text an unlimited number of times and access extra features.

Hemingway Editor

Pros:

• Powerful writing tool;
• High-accuracy grammar checker;
• Readability score;
• Algorithm-based features;
• Streamlined UI.

Cons:

• It may seem too convoluted for novices.

While this reputable service is mostly known for its text analysis tools, it also has a powerful AI grammar checker with detailed writing stats. The platform was designed to help its clients improve their writing skills. It can be accessed online from any device. After checking grammar and spelling, users can utilize the built-in tools to detect long sentences, passive voice, adverbs, and excessive qualifiers.

Hemingway uses an easy-to-understand color coding system. It enables users to identify the areas for improvement and elevate the quality of their writing. Recently, the developers have upgraded this service with AI-driven tools that enable users to rephrase their content to make it easier to read and ensure tone consistency. Users can access the readability score and make the necessary edits to achieve their target score. The individual license costs $8.33/month, while the team plan costs $12.50 per user per month.

Paperpal

Pros:

• Advanced grammar checker;
• Highlights vocabulary inconsistencies;
• AI-driven tools;
• Tone enhancement feature.

Cons:

• Mostly for academic writers.

College students and academics prefer to use this grammar checker, as it has advanced algorithm-based tools built to improve the quality of academic writing. These AI features were specifically trained on large databases of research papers that were carefully edited and peer-reviewed.

Paperpal may flag contractions as mistakes and suggest using academic vocabulary. The grammar checker has demonstrated high effectiveness when we tested it. This service highlights inconsistencies, checks spelling and punctuation mistakes, and evaluates a writing style. Moreover, it has an in-built translator, paraphrasing tool, and plagiarism checker.

Users can click the “Make academic” button to automatically improve the overall tone of their publication. Clients can choose between American and British English spelling. Moreover, this service has tools for creating citations. 

The service costs $11.50 per month when billed annually and has a limited free version. It’s available online from any browser and as an add-on for Microsoft Word.

QuillBot

Pros:

• Advanced grammar checker;
• Powerful paraphrasing capabilities;
• High accuracy;
• Inbuilt summarizer and citation generator.

Cons:

• Punctuation issues.

This paraphrasing service comes with a set of useful writing tools, including a free grammar checker. It detects many mistakes and ensures that the output text is free of errors and stylistic inconsistencies. This service also allows users to access other advanced tools that aren’t available on other similar platforms, including the co-writing tool and summarizer.

After using the grammar checker, we were impressed with its high accuracy. The service scans text and detects many errors. However, when checking punctuation, it may have difficulties with double quotes and may make incorrect suggestions. This is why it’s better to double-check its recommendations.

Users can also utilize the paraphrasing tool to edit their texts. QuillBot rewrites sentences, making them sound more natural. The free version has the “Fix All Errors” option that enables users to fix multiple issues at once. The paid version costs $4.17 per month when billed annually. It allows users to get advanced grammar recommendations and use paraphrasing tools without any limitations. Moreover, premium members can generate custom summaries.

WhiteSmoke

Pros:

• Professional grammar checker;
• A choice of writing tools;
• Multi-language support;
• Mobile app.

Cons:

• The desktop version is limited.
• The customer support team takes too long to respond.

This comprehensive writing assistant is accessible from any device. It comes with a variety of writing features, including a pro-grade grammar checker. Moreover, it checks texts for plagiarism and offers suggestions on how to improve sentence structure. This service is available in 55 languages and has native apps for different OS. The installation process is quite streamlined and does not take longer than a few minutes.

WhiteSmoke has impressive accuracy and detects even minor grammatical issues and spelling mistakes. It assigns a score to each text, which makes it easier for users to identify the areas for improvement. 

Even though this service stands out for its professional tools, it has some limitations as well. The desktop version allows users to check only up to 10,000 characters per scan. The interface may seem too convoluted even for experienced users. This solution does not have a free trial, so users will have to pay $6.59/month to access its features. It makes it one of the most affordable online grammar checkers available today.

How We Tested Online Grammar Checkers

We decided to test out each tool thoroughly instead of relying on reviews posted by other people who used these services. We used the same text to ensure the consistency of results and followed the same criteria. The following parameters were used:

• The percentage of corrected mistakes;
• The number of mistaken suggestions;
• The usability of the service;
• The availability of other tools.

This approach helped us choose the best online grammar checkers. Grammarly is the best web-based tool with an extensive choice of free features and unlimited grammar checks. While it also has a premium version, its free version allows users to check spelling in their texts without any restrictions. ProWritingAid is the best paid tool designed to help professional content writers significantly improve the quality of their content. 

The choice of the best service ultimately depends on the specific needs of each user and the texts they are going to check. Paid services often have free trial versions that allow users to assess their functionality without paying. Be sure to test out the available tools before committing yourself to a purchase.