The best grammar checker depends on what you write. Grammarly suits most business owners who want help everywhere they type, ProWritingAid suits long-form writers, LanguageTool suits people writing in more than one language, Hemingway Editor suits anyone who wants plainer writing, and QuillBot, Microsoft Editor, Ginger and Wordtune suit quick checks and rewrites.
Typos chip away at trust. A spelling mistake in a proposal, a muddled sentence on your website or a clumsy email to a client all make you look less careful than you are. A good grammar checker catches the slips you can't see because you've read the same paragraph ten times.
The tools below are well known and widely used. Some fix spelling and grammar, others focus on style, clarity or rewording whole sentences. I've focused on what each one is known for, so shortlist two and run the same piece of your own writing through both, such as a recent blog post or sales email.
What should you look for in a grammar checker?
- Accuracy. It should catch real mistakes without flagging correct sentences as wrong.
- UK English. Check you can set British spelling, so it doesn't change colour to color.
- Style and clarity. The better tools point out long sentences, passive voice and repeated words, not just errors.
- Where it works. Look for browser extensions and add-ons for the places you write, such as Gmail, Google Docs and Word.
- Tone and rewrites. Some tools suggest how to make a sentence friendlier, more confident or shorter.
- Privacy. If you write about clients or confidential projects, check how the tool handles your text.
Grammar checkers compared
| Tool | Best for | Stand-out feature |
|---|---|---|
| Grammarly | Most business owners | Checks wherever you type |
| ProWritingAid | Long-form writers | Detailed writing reports |
| LanguageTool | Writing in several languages | Multilingual checking |
| Hemingway Editor | Plain, readable writing | Highlights hard-to-read sentences |
| QuillBot | Rewording and quick checks | Paraphrasing tool |
| Microsoft Editor | Microsoft 365 users | Built into Word |
| Ginger | Quick corrections | Fixes whole sentences at once |
| Wordtune | Rewriting for tone | AI rewrites for clarity and tone |
Plans and features change often, so check each vendor's current plans before you commit.
The best grammar checkers for business writing
1. Grammarly
Grammarly is the best-known grammar checker. It works in your browser, in desktop apps and on your phone, and it checks spelling, grammar, punctuation, clarity and tone as you write.
Who it suits: busy business owners who write emails, posts and documents all day and want help everywhere.
What stands out: how easy it is to use. Once it's installed, suggestions appear in most of the places you write.
Watch out for: it can be quite eager with suggestions, so keep your own voice rather than accepting every change.
2. ProWritingAid
ProWritingAid combines a grammar checker with in-depth style reports. It looks at sentence length, repeated words, readability and pacing, and it's popular with authors and bloggers.
Who it suits: people who write long articles, guides or books and want to improve their writing over time.
What stands out: the reports, which show patterns in your writing that a simple checker would never mention.
Watch out for: there's a lot of feedback, which can feel overwhelming if you just want a quick spelling check.
3. LanguageTool
LanguageTool checks grammar, spelling and style in many languages, including British English. It works in the browser, in Word and Google Docs, and it has a free version.
Who it suits: businesses that write in more than one language or work with international teams.
What stands out: its language support. It's one of the strongest choices if English isn't the only language you write in.
Watch out for: the free version checks a limited amount of text at once, so long documents may need splitting up.
4. Hemingway Editor
Hemingway Editor focuses on readability. It highlights long, complicated sentences, passive voice and weak phrases in different colours and gives your writing a readability grade.
Who it suits: anyone whose writing tends to run long, and anyone writing website copy for busy readers.
What stands out: the colour highlighting, which makes it obvious where a reader is likely to get lost.
Watch out for: it's about clarity rather than grammar, so pair it with a spelling and grammar checker.
5. QuillBot
QuillBot is best known for its paraphrasing tool, which rewrites sentences in different styles. It also includes a grammar checker, a summariser and other writing tools.
Who it suits: people who often need to reword a sentence or shorten a paragraph.
What stands out: the paraphraser. It's handy when a sentence is correct but still doesn't sound right.
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Watch out for: rewriting tools can change your meaning, so always read the new version before you use it.
6. Microsoft Editor
Microsoft Editor is the writing assistant built into Microsoft Word and other Microsoft 365 apps. It checks spelling and grammar and offers suggestions on clarity and conciseness.
Who it suits: businesses that already write most of their documents in Word.
What stands out: convenience. If you're in Word all day, it's already there and needs no set-up.
Watch out for: it's at its best inside Microsoft's own apps, so it won't follow you everywhere you write.
7. Ginger
Ginger is a long-standing grammar checker that corrects whole sentences in one go. It also includes a rephrasing tool and translation features.
Who it suits: people who want simple, fast corrections without detailed style feedback.
What stands out: the sentence-level corrections, which fix several mistakes at once.
Watch out for: it's less detailed than Grammarly or ProWritingAid, so serious writers may want more depth.
8. Wordtune
Wordtune is an AI writing assistant from AI21 Labs. It suggests alternative ways to phrase your sentences, from more formal to more casual, shorter or longer.
Who it suits: people who know what they want to say but struggle to say it smoothly.
What stands out: the range of rewrites, which helps you find the version that sounds most like you.
Watch out for: it's a rewriting tool first, so use a grammar checker alongside it for the final polish.
How to choose the right grammar checker
Start with where you write. If you jump between email, social media and documents all day, a tool that works everywhere, such as Grammarly or LanguageTool, will catch the most mistakes. If you write mainly in Word, Microsoft Editor may be enough on its own. If English isn't your only language, LanguageTool should be on your shortlist.
Then think about what kind of help you want. For spelling and grammar, most of these tools will do. For clearer writing, Hemingway Editor and ProWritingAid go further. For rewording, QuillBot and Wordtune are the specialists. And whatever you choose, read your writing aloud before you press send. No checker beats your own ear.
If you want to sharpen your writing beyond the tools, read my tips to improve your writing. My post on why proofreading matters at work explains what's at stake, and if you use AI to draft, see how to stop AI writing sounding like AI.
Building a tool in this space? Here's how tools get considered for my roundups.
Frequently asked questions
What is the best grammar checker?
Grammarly suits most business owners, ProWritingAid suits long-form writers, LanguageTool suits multilingual writing and Hemingway Editor suits anyone who wants plainer writing.
Is there a free grammar checker?
Yes. Grammarly, LanguageTool, QuillBot and Hemingway Editor all offer a free version, though the extra style and rewriting features usually sit in their premium plans.
Can grammar checkers use British English?
Most of the well-known tools, including Grammarly, ProWritingAid and LanguageTool, let you set British English so your spelling stays consistent.
Do grammar checkers replace proofreading?
No. They catch many errors, but they can miss context and sometimes suggest the wrong fix, so read important writing yourself before you send it.
