Best Grammar Checker for Essays (Free Options Compared)
There is no single best grammar checker for every student. The right one depends on whether you need a free plan, what you write in (Google Docs or Word), the language you write in and how much you care about privacy. Here is a fact-based comparison to help you choose.
Updated 21 October 2026 · EssayWriting.com editorial team
- Grammarly, LanguageTool, ProWritingAid and QuillBot all offer free plans; Word and Google Docs have built-in checks.
- Checkers catch surface errors but miss correctly spelled wrong words, factual errors and citation formatting.
- Using a checker on your own writing is generally allowed; check your course policy for generative features.
How we compiled this: features below come from each provider's public website as of October 2026. We have not run our own accuracy benchmark, so we do not rank tools by accuracy. Plans and prices change often; check the provider's site before paying.
Grammar checkers compared
| Tool | Free plan | Where it works | Worth knowing |
|---|---|---|---|
| Grammarly | Yes | Browser extension, desktop app, Word, Google Docs | Paid plan adds tone and clarity rewrites; paid tiers include a plagiarism check |
| QuillBot | Yes | Web, browser extension, Word, Google Docs | Grammar checker sits alongside paraphrasing and citation tools |
| LanguageTool | Yes | Web, browser extension, Word, Google Docs | Supports many languages; core engine is open source |
| ProWritingAid | Yes, with limits | Web, desktop, Word, Google Docs, Scrivener | Detailed style reports (repetition, sentence length) useful for long essays |
| Microsoft Word Editor | Basic checks included in Word | Word | No extra install if you already use Word |
| Google Docs | Yes, built in | Google Docs | Spelling and grammar suggestions under Tools |
How to choose
If you only need clean, error-free essays
The free plan of any tool above, or the checker already built into Google Docs or Word, will catch most spelling and basic grammar errors. Start there before paying.
If you write long essays or dissertations
Style reports (overused words, sentence variety, readability) matter more than catching typos. Look for a tool with per-document reports.
If English is not your first language
Look for explanations of each correction, not just fixes, so you learn the rule. Multilingual support helps if you also write in another language.
If privacy matters
Your essays may contain personal information. Read the provider's privacy policy, check whether text is used to train models, and prefer tools that let you opt out.
Grammar checkers and academic integrity
Correcting spelling and grammar in your own writing is generally allowed. Rewriting tools that change your sentences or generate text are a grey area, and some schools treat heavy use as misconduct. Check your school's policy. A grammar check is not the same as a paraphraser or an AI writer.
A five-minute proofreading routine
- Run the checker and accept only corrections you understand.
- Read the essay aloud; tools miss real words used wrongly (their/there, affect/effect).
- Check every citation against your style guide (APA or MLA).
- Check names, dates and numbers by hand.
- Read the first and last sentence of every paragraph to test flow.
Related
What grammar checkers catch, and what they miss
| Usually caught | Often missed |
|---|---|
| Misspellings | Correctly spelled wrong words (form/from, trial/trail) |
| Subject-verb agreement | Ambiguous pronouns (which "it"?) |
| Missing articles and commas | Factual errors and wrong dates |
| Repeated words | Weak arguments or unsupported claims |
| Some passive voice and wordiness | Citation formatting errors |
This is why a checker is the first step of proofreading, not the last. Use it to clear the noise, then read for meaning.
Free vs paid: what you actually get
Across the main tools, free plans generally cover spelling, basic grammar and punctuation. Paid plans generally add some combination of style and clarity suggestions, tone detection, sentence rewrites, longer document limits and, for some tools, plagiarism checking. Exact features and limits change, so compare the current plan pages before paying. For most school essays, a free plan plus careful reading is enough.
How to test a grammar checker yourself in 10 minutes
- Take a paragraph from an old essay that your teacher marked up.
- Paste it into two or three free tools.
- Compare which tools flagged the errors your teacher found, and which suggestions were wrong or unhelpful.
- Check whether each tool explains why a change is needed.
- Pick the one that caught most of your real mistakes with the fewest bad suggestions.
Your own writing habits matter more than any general ranking. A tool that consistently catches your typical errors is the best one for you.
Grammar checker settings worth changing
- Language variant: set US, UK, Canadian or Australian English to match your school, or the tool will "correct" correct spellings.
- Formality or goal: choose academic or formal where available so suggestions fit essay style.
- Ignored words: add technical terms and names from your subject so they stop being flagged.
- Data settings: look for options about whether your text can be used to improve the product.
Common grammar issues in student essays
| Issue | Example | Fix |
|---|---|---|
| Comma splice | The data was clear, the conclusion was not. | Use a full stop or semicolon, or add "but". |
| Its / it's | The company changed it's policy. | its (possessive); it's = it is. |
| Affect / effect | The policy effected students. | affected (verb); effect is usually the noun. |
| Dangling modifier | Walking to class, the rain started. | Walking to class, I noticed the rain start. |
| Unclear "this" | This shows the problem. | This delay shows the problem. |
Accessibility and device support
If you write on a phone or tablet, check whether the tool has a mobile keyboard or app. If you use a screen reader, test whether suggestions are announced clearly. Many students write across several devices, so a tool that works in both Google Docs and a browser is often the most practical choice.
Quick answers to common questions
Do grammar checkers work for UK English?
Most let you choose a variant such as UK or US English in settings.
Frequently asked questions
What is the best free grammar checker for essays?
Several have usable free plans, including Grammarly, QuillBot, LanguageTool and ProWritingAid, and Google Docs and Word have built-in checks. The best choice depends on where you write and what you need explained.
Is using a grammar checker cheating?
Fixing spelling and grammar in your own writing is generally allowed. Tools that rewrite or generate text may break your school’s rules, so check the policy.
Do grammar checkers catch everything?
No. They miss correctly spelled wrong words, factual errors and citation formatting. Always proofread by reading aloud.
Is Google Docs grammar check good enough?
For basic spelling and grammar, often yes. Dedicated tools add style reports and explanations.
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