Best grammar and spell checkers in 2025

Writing error-free content is essential, whether you’re a student, a professional, or a content creator. A misplaced comma or a misspelled word can weaken your message and credibility. Fortunately, with the rise of AI and natural language processing technologies, the best grammar and spell checkers today do much more than catch simple typos. They help improve tone, structure, and even suggest better phrasing. In this article, we’ll explore the best grammar checker free tools, top spell checkers, and combined writing assistants that can make your writing shine.

What are grammar checkers?

Grammar checkers are software tools designed to analyze your text and identify grammatical errors. Their functionality extends beyond just catching subject-verb disagreements. Modern AI grammar checkers detect improper punctuation, awkward phrasing, stylistic issues, and even tone inconsistencies. The best grammar check tools now leverage machine learning to provide context-aware suggestions.

Key benefits:

• Corrects grammar mistakes in real time
• Enhances sentence structure and readability
• Offers tone and clarity suggestions
• Ideal for language learners and professionals

Spelling checkers explained: How they improve your text

Spell checkers are digital tools that identify and correct misspelled words. Unlike grammar checkers, spell checkers focus exclusively on word accuracy. They typically underline incorrect words and suggest alternatives from a dictionary database. While this might seem basic, spell checkers play a crucial role in avoiding embarrassing typos and improving clarity.

How they work:

• Compare typed words against a predefined dictionary
• Highlight unrecognized words
• Suggest correct spellings or alternatives

Grammar check vs. Spell check: Understanding the difference

Though grammar and spell check tools serve different purposes, they often work hand in hand. Grammar checkers handle sentence-level issues, while spell checkers focus on word-level corrections. Many modern writing assistants combine both features into a single tool for user convenience.

Grammar checkers

• Focus on sentence structure and syntax
• Suggest tone and clarity improvements

Spell checkers

• Detect misspelled words
• Offer dictionary-based corrections

Combined Tools integrate both to provide a comprehensive writing assistant that ensures accuracy and professionalism.

Best grammar checkers

1. Grammarly

Grammarly is arguably the most popular AI grammar checker on the market. It offers real-time grammar, spelling, and punctuation correction along with advanced features such as tone detection and clarity improvements. Grammarly is available as a browser extension, desktop app, and mobile app, making it highly versatile. The AI engine behind Grammarly is constantly learning, offering increasingly nuanced suggestions for better writing. The premium version unlocks features like plagiarism detection and full-sentence rewrites. Whether you’re writing an email or crafting a blog post, Grammarly ensures your content is polished and professional.

Pros: Advanced grammar and tone suggestions, real-time corrections, browser integration
Cons: Premium version required for full features
Best for: Students and content creators

2. ProWritingAid

ProWritingAid is a comprehensive writing assistant geared toward in-depth editing. It analyzes your text for grammar, style, and structure, offering detailed reports and suggestions. Unlike other tools, it gives visualizations of sentence length, passive voice, and overused words. While it can seem overwhelming due to the sheer amount of data it provides, it’s incredibly useful for authors and long-form writers who want to refine every aspect of their prose. It also integrates with tools like MS Word, Scrivener, and Google Docs.

Pros: Detailed writing reports, in-depth grammar checks
Cons: Can be overwhelming for casual users
Best for: Authors and long-form writers

3. LanguageTool

LanguageTool is an open-source grammar checker that supports over 25 languages. It is ideal for multilingual users and integrates seamlessly with platforms like ONLYOFFICE. LanguageTool uses AI to provide grammar, punctuation, and style suggestions and includes a built-in synonym finder. While not as polished as premium tools, it’s a great free alternative that respects user privacy. It is also particularly useful for non-English content, making it a favorite among international teams.

Pros: Open-source, multilingual support, integration with ONLYOFFICE
Cons: Slightly less accurate than premium tools
Best for: Multilingual users

4. Hemingway Editor

The Hemingway Editor focuses on clarity and readability. It highlights complex sentences, passive voice, and adverbs to help make your writing more concise and impactful. While it lacks the robust grammar-checking capabilities of other tools, it’s excellent for writers who want to improve their style and engage readers better. The desktop version works offline, which is handy for writers working without a stable internet connection. Hemingway is not a traditional grammar checker, but it’s a valuable companion for self-editing.

Pros: Highlights readability issues
Cons: Doesn’t detect basic grammar errors
Best for: Bloggers, storytellers

5. Ginger

Ginger is a solid grammar and spell checker with added features like a text reader and translation for over 40 languages. It’s particularly helpful for ESL (English as a Second Language) users thanks to its intuitive interface and contextual grammar suggestions. Ginger also includes a sentence rephraser and a personal trainer that helps users learn from their mistakes. While the UI isn’t as polished as others, it remains a reliable tool for quick grammar fixes and writing improvement.

Pros: Grammar and translation tool
Cons: UI less intuitive
Best for: ESL users

Best spell checkers

1. Microsoft Editor

Microsoft Editor is integrated into Microsoft Word and Outlook and available as a browser extension. It checks spelling, grammar, and style in real-time. The tool leverages Microsoft’s AI to deliver contextual suggestions, and the premium version offers even more advanced features, such as similarity checks and style critiques.

Pros: Built into Office, accurate suggestions
Cons: Requires Microsoft account
Best for: Business and academic users

2. Hunspell

Hunspell is a powerful open-source spell checker used in many software applications, including LibreOffice and Firefox. It supports complex languages and morphological analysis, making it suitable for software developers and localization teams. Custom dictionaries can be added to enhance its functionality. Although it requires technical skills to implement, Hunspell is a robust tool for advanced users.

Pros: Open-source, customizable
Cons: Requires technical knowledge
Best for: Developers, localization teams

AI solution for collaborative editing

Many writing assistants—such as Grammarly, ProWritingAid, LanguageTool and Microsoft Editor—combine grammar and spell checking in one interface, offering a streamlined experience for users who want real-time feedback and stylistic improvements without switching tools. These platforms are suitable for everyday users, students, and professionals alike, helping improve writing quality with suggestions for clarity, tone, and conciseness.

However, for users who need a more advanced, integrated experience that goes beyond basic editing features, ONLYOFFICE Docs stands out with its built-in AI assistant and full-featured document editing environment. ONLYOFFICE Docs is a collaborative online office suite that includes editors for text documents, spreadsheets, presentations, and fillable forms, all accessible within a single workspace. It’s designed for both individual productivity and team collaboration, supporting real-time co-editing, commenting, version history, and compatibility with a wide range of file formats.

The AI assistant in ONLYOFFICE Docs enhances this suite by offering natural-language-powered features such as grammar and spell checking, smart text summarization, automatic translation, tone adjustments, and rewriting suggestions. One of its key strengths is the flexible integration with multiple AI providers, allowing users to choose the most suitable provider for each specific task—for example, using one provider specialized in translations and another for text analysis or summarization. This modular approach helps ensure better performance, accuracy, and compliance with various privacy standards.

Because the assistant is natively embedded into the editing interface, there’s no need to rely on third-party browser extensions or external platforms, making the experience smooth and distraction-free. This makes ONLYOFFICE Docs an ideal solution not just for individual users, but also for teams in secure, self-hosted environments, such as enterprises, educational institutions, and government organizations, where data sovereignty and user control are critical.

With its powerful combination of collaborative tools and customizable AI capabilities, ONLYOFFICE Docs offers a robust, all-in-one workspace for creating high-quality content with ease and confidence.

Pros: Fully integrated into ONLYOFFICE Docs, includes ChatGPT-powered features
Cons: Must be used in ONLYOFFICE suite
Best for: Teams using office suites, collaborative editing

Choosing the right writing assistant for your needs

Selecting the best grammar and spell check tool depends on your writing context. If you need real-time suggestions across apps, Grammarly is a solid choice. Authors will benefit from the detailed insights of ProWritingAid. For multilingual content, LanguageTool offers great support. Microsoft Editor is best suited for users already embedded in the ecosystem. If you’re using collaborative suites, the AI assistant in ONLYOFFICE is unbeatable in integrating grammar and spell checking with powerful AI tools.