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Grammar Checker — Fix Errors Instantly, Free

Paste your text and instantly find grammar, spelling, and style errors. Colour-coded results. One-click fixes. Runs entirely in your browser — no API calls, no signup, 100% private.

20+
Error types detected
0
API calls made
3
Colour-coded categories
Free
No account needed
0 words

Results will appear here — errors highlighted in colour with suggested fixes.

⚡ How to Check Your Grammar

1

Paste or type your text

Copy and paste your essay, email, report, cover letter, or any text into the input area above. You can also type directly.

2

Click Check Grammar

The tool scans your text instantly using rule-based pattern matching running entirely in your browser — no waiting, no upload.

3

Review colour-coded results

Spelling errors appear in red, grammar issues in orange, and style suggestions in blue. Each highlight shows the specific issue and a suggested fix.

4

Fix errors — one by one or all at once

Click "Fix All" to apply all corrections instantly, or address issues individually if you prefer to review each change.

5

Copy your corrected text

Click "Copy Corrected Text" to copy the fixed version to your clipboard, ready to paste into any document or app.

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🔍 What Errors Does This Tool Detect?

The grammar checker identifies over 20 types of errors across three categories — each colour-coded so you can spot issues at a glance.

🔴

Misspellings

Common spelling mistakes caught against a built-in dictionary.

Spelling
🔴

Repeated Words

Catches accidental word repetitions like "the the" or "and and".

Spelling
🟠

Subject-Verb Agreement

Detects mismatches like "she go" or "they is" in your sentences.

Grammar
🟠

Missing Capitalisation

Flags sentences that don't start with a capital letter after a full stop.

Grammar
🟠

Confused Words

Catches commonly confused pairs like their/there, your/you're, its/it's.

Grammar
🔵

Double Spaces

Removes extra spaces between words that make text look unprofessional.

Style
🔵

Sentence Fragments

Identifies incomplete sentences that lack a subject, verb, or both.

Style
🔵

Style Issues

Flags wordy phrases, passive overuse, and other clarity improvements.

Style

📋 Most Commonly Confused Words in English

These are the word pairs that trip up even native English speakers. The grammar checker catches all of these automatically.

Confused Pair Correct Usage Example
their / there / they're Their = belonging to them. There = a place. They're = they are. "They're going to their house over there."
your / you're Your = belonging to you. You're = you are. "You're welcome to bring your laptop."
its / it's Its = belonging to it. It's = it is. "It's clear the dog lost its collar."
affect / effect Affect = verb (to influence). Effect = noun (the result). "The change will affect the effect on sales."
then / than Then = time sequence. Than = comparison. "She finished earlier than expected, then left."
lose / loose Lose = to misplace. Loose = not tight. "Don't lose the loose screws."
💡 Tip: The grammar checker flags these automatically, but understanding why they're different helps you write correctly from the start — not just fix errors after the fact.
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👥 Who Should Use This Tool?

🎓

Students

Catch errors in essays, assignments, and dissertations before submitting. A cleaner draft means fewer deductions for language errors.

💼

Professionals

Polish emails, reports, proposals, and presentations before sending to clients or senior management.

✍️

Content Creators

Check blog posts, social media captions, and video scripts for errors before publishing to maintain credibility.

🌍

Non-Native Speakers

Catch grammar patterns that are common mistakes for speakers of other languages — subject-verb agreement, article usage, and more.

📧

Job Seekers

Review cover letters and emails before sending to employers. A single grammar error can cost you an interview.

🏢

Small Business Owners

Ensure customer-facing copy — website text, product descriptions, social posts — is error-free and professional.

✅ Tips for Getting the Most from the Grammar Checker

  • 1
    Use it as a first pass, not a final check. This tool catches common errors quickly, but always read through your text manually after — especially for tone, clarity, and context-specific issues.
  • 2
    Review each correction before accepting. The "Fix All" button is convenient but sometimes a flagged item is intentional stylistic choice. Review suggestions individually for important documents.
  • 3
    Check in sections for very long documents. For documents over 2,000 words, paste and check in sections for faster, more manageable results.
  • 4
    Pair with our Paraphrasing Tool for clarity. After fixing errors, run problematic sentences through the paraphraser to improve flow and readability.
  • 5
    Read your text aloud after correcting. Your ear catches awkward phrasing that your eye misses. If a sentence sounds wrong when spoken, it probably needs rewriting.
Limitation to know: This tool uses rule-based detection, not machine learning. It catches common errors very reliably but may miss complex contextual issues — for example, using the right word in the wrong context. For critical documents, combine this tool with human proofreading.

Check Your Grammar Now

Free, instant, 100% private. No API calls, no signup required.

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❓ Frequently Asked Questions

How does this grammar checker work?
This tool uses rule-based pattern matching to identify common grammar, spelling, and style issues. It checks against a built-in dictionary and a set of grammar rules — all running locally in your browser using JavaScript. No external services or AI APIs are called.
Is my text sent to any server or stored?
No — never. All checks run entirely in your browser using client-side JavaScript. Your text is never sent to any server, third party, or AI service. Your content stays completely private on your device. When you close the tab, the text is gone.
What types of errors does it detect?
The tool detects over 20 error types including: common misspellings, repeated words, subject-verb agreement issues, missing capitalisation after periods, double spaces, commonly confused word pairs (their/there/they're, your/you're, its/it's, affect/effect, then/than, lose/loose), and basic style issues like sentence fragments.
Is it as accurate as Grammarly or other premium tools?
This tool uses rule-based detection rather than machine learning, so it catches common errors very effectively but may miss complex contextual issues that AI-powered tools detect. It is best used as a fast, private first-pass check. For critical professional documents, combine it with human proofreading.
What does the Fix All button do?
The Fix All button applies every suggested correction to your text at once. The corrected text replaces your original input so you can review the changes and make further manual edits. For important documents, we recommend reviewing each correction individually rather than using Fix All blindly.
Is there a word limit?
There is no strict word limit. However, for very long documents (over 2,000 words), checking in sections gives faster results and makes it easier to review corrections. The tool processes text in your browser so speed depends on your device.
Does it work for non-native English speakers?
Yes — this is one of the most common use cases. The tool is particularly useful for catching patterns that non-native speakers commonly struggle with, including subject-verb agreement, article usage, and confused word pairs. It currently supports English text only.
Does this work on mobile phones?
Yes. ToolsNest is fully mobile-responsive and works on Android and iOS browsers. You can paste and check text directly from your phone without installing any app.

🔧 Related Tools

🔄 Paraphrasing Tool 📝 Text Summarizer 🔍 Plagiarism Checker 📋 Cover Letter Generator 🔢 Word Counter 🤖 All AI Tools
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