15 Best Free AI Grammar Checkers for Writers in 2025

Writing is easier when you can focus on your ideas instead of worrying about grammar and punctuation.

AI tools now make it simple to fix mistakes, rephrase sentences, and improve clarity without needing a full edit from someone else. They help you save time and make your writing sound smoother across emails, documents, and articles.

In this article, we'll cover the 15 best free AI grammar checkers for writers in 2025. Let's dive in!

What is an AI Grammar Checker?

An AI grammar checker is a tool that automatically reviews your writing and suggests improvements in real time. It uses artificial intelligence to identify errors, improve phrasing, and make your text clearer and easier to read.

Here’s what these tools can do:

• Fix grammatical and spelling mistakes by spotting typos, incorrect tenses, and punctuation issues.

• Proofread your writing to highlight unclear sentences and make them more concise.

• Rewrite and paraphrase text to improve tone, flow, or readability.

Why Use AI Grammar Checkers?

Using AI grammar checkers helps you write faster, clearer, and more accurately without relying on manual editing. These tools save time, improve quality, and make it easier to maintain a consistent tone across all your writing.

Here are a few reasons to use them:

• Catch mistakes early - Automatically find grammar, spelling, and punctuation errors as you write.

• Improve readability - Suggest ways to make sentences smoother and easier to understand.

• Enhance tone and style - Adjust phrasing to match a casual, formal, or professional tone.

• Paraphrase when needed - Reword sentences using built-in AI paraphraser tools.

• Save time editing - Cut down on manual proofreading and revisions.

15 Best Free AI Grammar Checkers in 2025

Without further ado, here's our list of the 15 best free AI Grammar checkers in 2025:

1. Grammit

First up on our list of the best free AI grammar checkers is Grammit. Grammit is your personal AI grammar checker and writing assistant that helps you catch mistakes and improve your writing anywhere you work.

Here's how Grammit stands out:

• AI-powered grammar checking - Grammit helps you check your grammar, catch mistakes, and suggest improvements using AI.

• AI writing assistant - Use Grammit to paraphrase, rewrite, and improve your writing. Ask questions and give it custom prompts to get the best results.

• Grammit works anywhere - Take Grammit with you anywhere you work to improve your writing.

• Privacy first - Grammit puts privacy first and checks your writing directly on your computer using a local, on-device LLM, It never sends your writing to external servers.

• Price - Grammit is free!

2. Grammarly

Grammarly AI helps writers identify grammar, spelling, and punctuation mistakes in real time. It provides tone adjustments, clarity improvements, and writing insights to strengthen overall readability.

Most tools like Grammarly integrate with browsers and text editors to help writers maintain accuracy across all platforms.

Pricing: Free plan available, but AI writing features are only available for Premium users ($30/month).

3. LanguageTool

LanguageTool checks writing for grammar, punctuation, and style issues across multiple languages. It helps refine structure and ensures consistency, especially for multilingual writers.

The tool also offers context-aware suggestions that make text sound smoother and more professional.

Pricing: Offers a free plan, but AI features are available on the Premium plan ($24.90/month).

4. Flawlessly AI

Flawlessly AI focuses on improving sentence structure and clarity. It detects grammar errors and awkward phrasing, suggesting quick edits that improve flow.

Writers use it to polish drafts without needing deep manual revisions.

Pricing: Free to use.

5. Quillbot AI

Quillbot AI combines grammar correction with rewriting capabilities. It identifies grammatical issues and offers paraphrased alternatives to improve sentence tone or style.

Typically, tools like Quillbot are used simplify or rephrase text while keeping the original meaning intact.

Pricing: Limited free plan available.

6. ProWritingAid

ProWritingAid provides detailed grammar and readability checks for longer writing projects. It analyzes word choice, sentence structure, and tone consistency.

It is used to improve writing rhythm, reduce redundancy, and maintain professional quality throughout their work.

Pricing: Free plan includes a 500 word count limit and limited rewrites.

7. Trinka AI

Trinka AI is built for academic and technical writing. It reviews grammar, word usage, and tone to match formal standards.

It's primarily used in research and professional fields use it to ensure precision and correctness in their documents.

Pricing: Free plan includes 5,000 words/month.

8. Writefull

Writefull is designed for research and academic writing. It checks grammar and phrasing based on patterns found in scientific literature.

It's primary use case is for fine-tuning sentence flow and align with professional writing conventions.

Pricing: Limited free plan, unlimited access is $21/month.

9. Grammar Check AI

Grammar Check AI offers quick grammar and clarity checks for any type of writing. It identifies grammatical errors and suggests smoother alternatives without overcomplicating the process.

These type of tools are, generally, used to make fast edits and improve readability.

Pricing: $7/month for 500,000 AI words.

10. Scribbr Grammar Checker

Scribbr focuses on academic proofreading and clarity. It reviews grammar, punctuation, and sentence structure to make research papers more precise.

Scribbr can be used to ensure your work reads clearly and follows a professional tone.

Pricing: Limited free plan.

11. Wordvice AI

Wordvice AI helps writers refine academic and business documents. It reviews grammar, tone, and phrasing to make writing more natural and coherent.

Sites like Wordvice are pretty useful for editing essays, research papers, and reports with a focus on clarity and precision.

Pricing: Limited free plan, paid plan is $19.95/month.

12. Sapling AI

Sapling AI assists professionals in maintaining accurate and consistent writing. It checks grammar and phrasing in real time, providing suggestions that fit the user’s tone.

It's primarily used in messaging, email, and support tools to improve clarity and professionalism.

Pricing: Limited free plan, paid plan is $25/month.

13. ZeroGPT

ZeroGPT checks grammar and content clarity while also identifying signs of AI-generated text. It helps writers refine tone, fix errors, and ensure originality.

It’s useful for editors and content creators who want clean, authentic writing.

Pricing: Free plan available, Pro plan unlocks advanced usage ($9.99/month).

14. Linguix

Linguix corrects grammar, punctuation, and sentence structure while providing short learning tips. It helps writers understand common mistakes and improve their writing over time.

The tool works across browsers and platforms, offering seamless grammar support.

Pricing: $15/month.

15. Scribens

Scribens is a straightforward grammar and style checker for everyday writing. It detects grammar, punctuation, and word choice issues while suggesting simple fixes.

Many writers use it to quickly proofread drafts and make their text easier to read.

Pricing: Limited free plan, 9.90 € per month for access to AI features.

Write with Confidence

A reliable AI grammar checker helps you improve your writing, reduce editing time, and maintain clarity across all your work. Whether you need an AI writer for full drafts or a paraphraser to clean up sections, these tools give you the control and precision you need to write confidently in 2025.

We recommend trying out a few of the tools from the list above to see which one works best for you. Who knows? Maybe you'll find a tool that you love!

To recap, our suggestion for the best free AI grammar checker is Grammit. Grammit is your personal AI grammar checker and writing assistant that works on any website. Give it a try for free today!