Free AI tool

Grammar Checker

Paste your text and the AI returns a corrected version and a short list of what was changed. It fixes spelling, grammar and punctuation.

Please note: This tool uses an AI service. Your text is sent to Puter and an AI model provider to create the answer, and a Puter window may ask you to sign in with a free account. Do not enter confidential or personal information.

By iToolsLab Editorial TeamUpdated 14 October 2026How we build tools

What is grammar checker?

A grammar checker finds mistakes in spelling, verb forms, punctuation and sentence structure. Clean writing makes a better impression in emails, applications, essays and posts.

This tool asks an AI model to correct your text while keeping your meaning and style, and to list the main changes so you can learn from them.

How to use the grammar checker

  1. Paste your text.
  2. Press Check grammar and sign in to Puter if asked.
  3. Copy the corrected text and review the list of changes.

How the grammar checker works

Your text is sent with an instruction to correct errors and to list the main fixes. The model returns the corrected text followed by the list of changes.

Worked example

The sentence i has went to the market becomes I went to the market, with a note that the verb form and the capital letter were fixed.

Common uses of the grammar checker

  • Proofreading emails and job applications.
  • Checking student essays.
  • Cleaning up social media posts.
  • Fixing translated text.
  • Learning common grammar mistakes.

Tips and common mistakes

Read the corrected text once. Sometimes the AI changes a word you chose on purpose.

For names and technical terms, check the spelling yourself.

Background: what to know before you rely on it

Traditional grammar checkers use rules and word lists, while newer ones use language models that judge whether a sentence sounds natural. Models catch more subtle problems, such as a wrong preposition, but they can also be confidently wrong, especially with names, dialects and technical language. The best habit is to use the tool as a second pair of eyes and read the corrected version aloud. Over time, the list of changes shows your most common errors and helps you stop making them.

Private, free and fast

This tool is different from our other tools. When you press the button, your input is sent to the Puter service and to an AI model provider to create the answer, and a free Puter account is needed. We do not receive or store your text. It is free to use as often as you like. See more in all ai tools, or browse the full list of tools.

Frequently asked questions

Does it work for other languages?

It works best in English, but it can handle many other languages.

Will it change my style?

It tries to keep it. Review the result.

Is my text private?

No. It is sent to an AI service, so avoid confidential text.

Is there a word limit?

Very long texts may be cut off. Check them in parts.

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Results are for information and education. For legal, financial, medical or security decisions, check with a qualified professional. Verify AI generated content before relying on it.