Typos, awkward phrasing, and grammar mistakes slip into writing even when I try to be careful.
That’s where AI grammar checkers help. They fix errors and smooth out language before I send a message or publish a post.
These tools are smarter, faster, and more accurate than before.
Whether I’m writing an email, school paper, or blog, there’s an AI tool that fits what I need.
I tested many grammar checkers. Some were free, some cost money.
I picked the 15 best based on free word limit, one-click fix, and extra features. Here’s what I found!
Table of Contents
What are AI Grammar Checkers?
I used to rely on built-in spellcheck and hoped for the best. Most of the time, it missed things or worse, suggested changes that made no sense.
Then I tried an AI grammar checker.
At first, I thought it would only catch typos. But it did more.
It spotted unclear sentences, fixed punctuation I didn’t realize was wrong. Even reworded a few clunky lines without losing my voice.
That’s when I understood what these tools really are.
AI grammar checkers aren’t just for catching errors. They analyze how words fit together, suggest better phrasing, and make writing easier to read.
They can even adjust tone, more formal for work, more relaxed for messages.
In this blog, you’ll find more about the best AI grammar checkers in detail, all tested and reviewed by me.
At a Glance: The Best 15 AI Grammar Checkers
| Tools | Free Word Limit | One-Click Fix | Cost of Upgrade |
|---|---|---|---|
| Scribbr | Unlimited | Yes | Pay-per-use |
| QuillBot | Unlimited | Yes | Starting from $4.17 per month |
| PaperRater | Unlimited | Yes | Starting from $7.95 per month |
| GrammarCheck | Unlimited | Yes | Starting from $12 per month |
| Toolsaday | Unlimited | No | Starting from $7.99 per month |
| ProWritingAid | Unlimited | No | Starting from $10 per month |
| Grammarly | Unlimited | No | Starting from $12 per month |
| Wordtune | Unlimited | No | Starting from $6.99 per month |
| ZeroGPT | 1000 words | Yes | Starting from $7.99 per month |
| LanguageTool | 2000 characters | Yes | Starting from $2.91 per month |
| Wordvice | 500 words | Yes | Starting from $9.95 per month |
| Ginger Software | 450 words | No | Starting from $3.99 per month |
| Ahrefs | 1024 characters | Yes | Free |
| Reverso | 360 characters | No | Starting from €4.21 per month |
| Engram | 50 words | No | Starting from $12.99 per month |
How I Tested These AI Grammar Checkers
I didn’t want to rely on claims or marketing blurbs—I wanted to see how each AI grammar checker actually worked. So I tested them myself.
Free Word Limit
The first thing I looked at was how much I could use for free. Some grammar checkers cut me off after 50 words, while others let me paste full paragraphs without any problem. The difference was noticeable right away.
One-Click Fixes
Next, I checked if the tool had a “fix all” button. A few let me correct everything in one click, which saved time. Others made me go through each suggestion one by one. It worked, but it took longer.
Extra Features
I also explored what else the tool could do. Some came with extra tools like paraphrasers, tone changers, or translators. These added more value than simple grammar fixes. A few were pretty barebones and focused only on basic corrections.
By comparing these areas, I could tell which tools were useful right away, and which ones felt too limited.
How Do You Choose The Best AI Grammar Checkers?
After trying several AI grammar tools, I’ve figured out what really makes one better than the rest.
Here’s what I always look for before deciding if a tool is worth using.
Free Word Limit
I start by checking how many words I can use without paying.
Some tools only allow a few sentences, which isn’t enough. The better ones let me paste full paragraphs or more before asking me to upgrade.
One Click Fixes
I check if the tool has a “fix all” button. It makes editing faster.
If I have to accept every change one by one, it slows me down. The best tools fix everything at once with a single click.
Extra Features
I also look for tools that do more than fix grammar. Paraphrasers, tone changers, and translators add real value.
These extras help when I’m writing different types of content or switching between languages.
If a tool does well in all these areas, it usually earns a spot on my list.
The Best 15 AI Grammar Checkers (Ranked)
I tested dozens of tools to see which ones actually improve writing and save time.
These 15 stood out for their free word limit, one-click fix, and extra features.
1. Scribbr
I stumbled on Scribbr AI Grammar Checker while fixing a last-minute essay in both English and German.
I could paste my text directly or upload a document from my laptop.
The Add to Chrome option turned out to be more useful than I thought. It let me catch small grammar issues while I wrote online.
What really helped was the support for multiple languages. Besides English, it worked with Dutch, French, German, Portuguese, Spanish, and even Swiss German.
I also liked that I could use three heading sizes plus body text.
Moreover, there were no specific limitations to the word count.
Limitation: None.
This is what I did step by step:
Step 1: I went to the Scribbr grammar checker and pasted my text into the box.
Step 2: The tool highlighted all the problems automatically and immediately.
Step 3: To fix the problems, I hit the Fix all errors button.
Step 4: Everything was fixed in an instant. All I did was copy the text and use it on my paper.
There was no need to upgrade.
2. QuillBot
I started using QuillBot to fix grammar and rewrite sentences, but the free version had a character limit, which made things hard.
That’s when I tried the premium version, and it helped a lot.
The grammar checker finds more errors and explains them clearly. It even helps with sentence structure and word choice.
I use the different writing modes too, like Formal or Shorten, depending on what I need.
The best part? The “Accept All” button. One click, and all the grammar mistakes were fixed at once.
It saved me so much time, especially when I was in a hurry.
Limitation: Paraphraser and plagiarism checker are reserved for premium users.
This is what I did step by step:
Step 1: I headed straight to the QuillBot grammar checker.
Step 2: I entered the text and let the tool check for grammar issues.
Step 3: I clicked on Accept to fix wrong grammar.
Step 4: As I fixed the grammar one by one, the writing score improved.
Step 5: The best feature is the Accept all button. One click and all the grammar was fixed.
I decided to upgrade my plan.
The grammar checker found more mistakes and gave better suggestions. It even caught confusing wording and helped me fix the tone.
I also loved the unlimited word limit, so I didn’t have to cut my text into pieces anymore.
3. PaperRater
Next, I tried PaperRater. I pasted the text into the editor, and it scanned everything on its own.
I didn’t click around or fix things manually. One button fixed all the errors at once.
I didn’t notice any word limit, which was a relief. I’ve had tools stop me halfway through before, but not this one. I could paste my text or upload a file directly from my computer.
There was also a toolbar where I could change the text size, layout, and structure. That made the editing process smoother.
It worked well for me when I wanted something quick and automatic. I didn’t have to think much; it just got the job done.
Limitation: None.
This is what I did step by step:
Step 1: I opened the PaperRater grammar checker on my device.
Step 2: After inputting the text, the errors were detected automatically.
Step 3: Then, I just hit the Fix all errors button.
Looks like this after all errors are fixed.
There was no need to upgrade.
4. GrammarCheck
I tried GrammarCheck with a long text, almost 900 words. It worked fine. I didn’t hit any word limit, which was a nice surprise.
I could fix all the grammar issues with one push of a button, instead of going about it manually.
The tool gave me access to its grammar checker without me needing to sign up or log in.
It supports American, European, Australian, New Zealand, Canadian, British, and South African English.
Additionally, it checks spelling and punctuation.
Limitation: Upgrade to deep check.
This is what I did step by step:
Step 1: I opened GrammarCheck on my browser.
Step 2: Once I entered the text about 872 words, I hit the button Free Check.
The tool underlined the words that need to be corrected.
Step 3: I could fix the grammar manually by clicking on each underlined word.
Step 4: I could also press the Fix Errors button and correct all the grammar automatically.
I wanted to find out what happens when I hit the Deep Check button.
So I did. And it took me to Grammarly’s paid plan page.
Since I already have a Grammarly subscription, I ran the deep check on Grammarly.
Got the same result as using Grammarly grammar checker.
5. Toolsaday
Toolsaday AI Grammar Checker felt different right away.
It wasn’t just for fixing grammar. It had a paraphrasing tool, story generator, email writer, summarizer, and even a plagiarism checker.
It showed mistakes by highlighting the words. I clicked one, and a small window popped up. It gave me a better word.
Then came the slow part. I had to accept each suggestion one by one. It took some time, but the final result looked clean and clear.
It helped with more than just grammar. It helped me write in different ways, all in one place.
Limitation: No “fix all” option.
This is what I did step by step:
Step 1: I started by going to Toolsaday grammar checker.
Step 2: I input the text and pressed the button Check Grammar.
Step 3: The tool highlighted the wrong words. I pressed the button Check Grammar again.
Step 4: I clicked on the highlighted word, and a new window popped up. Then, I just chose the suggested word.
Step 5: I accepted all the suggestions one by one. It took some time.
I upgraded the free plan. Things changed fast.
Now I could paraphrase up to 10,000 characters at once!
Besides, I got access to all modes. Formal, casual, even custom ones.
6. ProWritingAid
This tool caught lots of grammar and style issues. But I had to go through and fix each one by hand.
I wish it had a one-click option to fix everything at once. That would save time.
I liked the Chrome extension. It let me check my writing inside emails and web forms.
That saved me from copying and pasting text back and forth.
Still, I had to click each suggestion to fix things. It felt a bit slow when I was in a rush.
The tool offered other tools like a plagiarism checker, a paraphrasing tool, a virtual reader, and more.
Limitation: No one-click solution.
This is what I did step by step:
Step 1: I opened the ProWritingAid grammar checker on my browser.
Step 2: I pasted the text into the box. The tool scanned automatically.
Step 3: A box appeared on the right showing suggestions for grammar improvement.
I clicked on the word to correct it on the paper.
Step 4: I did so until 0 suggestions were left.
Then, I copied the content and used it in my document.
7. Grammarly
I use Grammarly’s AI Grammar Checker almost every day.
When I finish writing, I paste the text into Grammarly’s editor and get instant feedback on mistakes.
But I don’t accept everything blindly. I always go through the suggestions and fix them manually, because sometimes it’s just off.
Besides grammar, it gives me extra tools to check for plagiarism, sentence clarity, and even helps with rewrites.
I also like seeing the content score. It tells me the word count, readability, and vocabulary strength, which helps me improve my writing overall.
Sometimes, I ignore the browser extension and just work directly in the editor. It’s cleaner that way.
Limitation: Sometimes flags correct sentences as incorrect.
This is what I did step by step:
Step 1: I opened Grammarly on my browser and clicked on New doc.
Step 2: I pasted a 1000-word essay and let the tool scan for grammar errors.
The red lines represent grammatical errors.
Step 3: I clicked on the wrong word on the right side panel. I clicked Accept to correct the word.
I had to correct these words manually, all 159 of them.
Since this is a free tool, I didn’t feel like upgrading to a paid plan.
8. Wordtune
I tried Wordtune because I wanted more than just grammar fixes.
First, I signed in with my Google account. The editor looked clean and easy to use. It didn’t seem to have a word limit, which I liked.
One thing that stood out is that it can expand or shorten your sentences.
It also suggests synonyms and offers smart context-based edits.
If I didn’t like a sentence, I used the Rewrite tool to make it sound better.
But it doesn’t fix all grammar errors at once. I had to review and apply changes one by one.
Wordtune felt like a creative assistant, not just a grammar checker.
Limitation: Doesn’t fix all grammar issues in one go.
This is what I did step by step:
Step 1: I accessed the Wordtune grammar checker.
Step 2: I dropped a 1000-word essay into the empty space.
The tool automatically underlined the grammatical errors.
Step 3: When I clicked on the underlined word, the tool showed me the correct grammar.
All I did was click on the blue word, and it was fixed.
I followed this process for every wrong word until all the problems were fixed.
Step 4: The tool also allowed me to experiment with the content.
For example, change the tone to Formal or Casual.
I didn’t see a reason to upgrade because I was happy with the free plan.
9. ZeroGPT
Let me share my experience with ZeroGPT AI Grammar Checker.
I pasted my messy text into the editor, clicked once, and it cleaned everything up. No need to check each word myself.
Saved me a lot of time.
It rewrote the whole thing with proper grammar, and green highlights showed me exactly what changed.
But ZeroGPT isn’t just a grammar tool.
It also checks for AI-written content, plagiarism, and even summarizes or paraphrases. There’s a translator and a word counter too.
The part I liked most was the Statistics report. It gave me details like reading time, keywords, character count, and more.
Limitation: Upgrading doesn’t help with grammar checking.
This is what I did step by step:
Step 1: I opened the ZeroGPT grammar checker on my browser.
Step 2: After inputting the text, I pressed the Check Text button.
Step 3: The tool rewrote the text with proper grammar. The green highlights indicate corrected words.
Step 4: Then, I clicked Statistics.
Step 5: It gave me an analytical report of the reading level, reading time, keywords, characters, words, and more.
Upgrading the plan wasn’t going to help much when it comes to grammar checking.
I use the upgraded plan of ZeroGPT for AI detection and plagiarism checking only.
10. LanguageTool
I started using LanguageTool to catch small mistakes.
The premium plan helped me fix deeper grammar issues, like unclear sentences and wrong word choices that I didn’t notice before.
One feature I really like is the style suggestions. It shows when I’m too wordy or repeat the same word again and again.
I also write in other languages sometimes. With Premium, I get smart corrections not just in English, but in German and Spanish too.
Now I use it for almost everything I write.
Limitation: Restricted to 2000 characters in the free version.
This is what I did step by step:
Step 1: I accessed LanguageTool on my browser.
Step 2: After I input the text within 2000 characters (358 words), the tool automatically highlights incorrect words in yellow.
Step 3: I clicked on the highlighted words listed on the right-hand corner.
Step 4: I just clicked on the blue word to fix it. I did the same for all 43 words.
I started using LanguageTool’s free version for grammar help, but after a while, I wanted more.
So I upgraded to the premium plan.
It helped me fix advanced grammar errors, like unclear sentences and wrong word choices, that the free version missed.
One of my favorite parts is the style suggestions. It tells me when a sentence sounds too wordy or when I repeat the same word too often.
I also write in more than one language sometimes. With Premium, I get corrections in multiple languages, not just English.
11. Wordvice
I tried Wordvice AI Grammar Checker for a short article.
The free version worked well, but it only allowed 500 words. I wanted to check longer content, so I got the $9.95 per month plan.
I liked how easy it was to use. I clicked on each grammar issue, reviewed the suggestion, and chose to Accept or Ignore.
The Double-tick button fixed all grammar mistakes at once. That saved me time.
With the paid plan, I could check up to 10,000 words per submission.
I also got access to other tools like a paraphraser and academic editing features.
Limitation: 500 words cap in the free version.
This is what I did step by step:
Step 1: I accessed the Wordvice grammar checker on my browser.
Step 2: After pasting my text, I pressed the Check Grammar button.
Step 3: The tool displayed all the grammatical errors on the right-side panel.
Step 4: By clicking on each issue, I could review it. Then, choose to Accept or Ignore it.
Step 5: Then I found the Double tick button. Clicking it fixed all the grammatical errors in one go.
Since I wanted to check grammar for larger content, I opted for the paid plan.
By getting the $9.95 per month plan, I gained access to other tools, not just the grammar checker.
Most importantly, I could submit and check the grammar of about 10,000 words per submission.
12. Ginger Software
I gave Ginger’s grammar checker a try.
After that, I got full access to features like translations in 40+ languages.
I used it to turn English text into Spanish and listened to it using the text-to-speech tool.
The personal trainer was a nice bonus. It gave me practice exercises based on my usual grammar mistakes.
Ginger works only in US and UK English for now. I downloaded it on both my laptop and phone, and I added it to Chrome.
One thing I didn’t love: it fixes sentences one at a time. That slowed me down sometimes.
Limitation: Restricted to 450 words in the free version.
This is what I did step by step:
Step 1: I opened Ginger Software in my browser.
Step 2: I pasted my text in the box and clicked Rephrase.
Step 3: Suggested grammar fixes were displayed below the box. I just selected the one that I liked.
It was kind of a bother that I had to fix each sentence one by one.
Step 4: I pressed Done and Copy.
After upgrading, I also got unlimited access to translations in over 40 languages.
I used it to turn English drafts into Spanish. Also, I could listen to them out loud using the text-to-speech tool.
The personal trainer was another surprise. It gave me short exercises based on my usual mistakes.
13. Ahrefs
Ahrefs AI Grammar Checker felt simple and smooth. It didn’t overwhelm me with rules or pop-ups.
I liked how fast it worked. I didn’t have to read long explanations or go through steps. It let me focus on writing, not correcting.
The tool just highlighted the wrong words in red and showed the right ones in blue next to them.
One click on “Accept edits,” and everything changed instantly. It fixed the sentence right there.
For basic grammar checks, this tool did the job well.
I didn’t feel like I needed to upgrade. For free, it worked better than I expected.
Limitation: Restricted to 1024 characters.
This is what I did step by step:
Step 1: I started by opening the Ahrefs grammar checker.
Step 2: I entered the text and hit Check Grammar.
Step 3: The tool highlighted the wrong words. Next to them, suggested the right grammar in blue.
Step 4: With one click on Accept edits, everything was fixed instantly.
I didn’t see the need to upgrade this tool for grammar checking.
14. Reverso
I first used Reverso’s free grammar checker.
It worked well, but the 360-character limit was a problem. So I switched to the premium plan.
Now I can check full pages without cutting them up. I also use the rephraser as much as I want. No word limit.
The grammar fixes are automatic, which is not something most tools offer.
It also helps with translation. I write in English and French, so that’s useful.
Limitation: Restricted to 360 characters in the free version.
This is what I did step by step:
Step 1: I opened the Reverso grammar checker on my browser.
Step 2: I input the text and the tool automatically fixed the grammar.
It also offered me an option to translate the text into another language.
It also offered me an option to translate the text into another language.
Step 4: I also clicked on the Rephrase button to see what happens.
Step 5: To paraphrase, I had to click on a sentence. I could only paraphrase one sentence at a time.
I started using Reverso’s free grammar checker to fix small mistakes, but it had limits. So I decided to try the premium plan.
I no longer had to limit myself to 360 characters.
Also, I could use the rephraser as much as possible for unlimited words.
15. Engram
Engram is a grammar checker that I discovered on my journey.
It has a 50 word cap, which is weird. Other tools gave me 500 words or more for free.
To use this tool, I had to upgrade later. Once I did, I got unlimited proofreading, paraphrasing, and translating.
Suddenly, I had access to seven paraphrasing styles, whereas the free version only allowed Standard and Formal styles.
Then I discovered privacy mode. I turned it on, and my writing stayed private; nothing was sent to outside services like ChatGPT.
Now, I write freely without worrying who’s reading my drafts behind the scenes.
Limitation: 50 words per search.
This is what I did step by step:
Step 1: I opened the Engram grammar checker on my browser.
Step 2: After typing 50 words, I pressed the Submit button.
Step 3: Since I had a few corrections, I just clicked on Accept.
Step 4: After that, I clicked on Go to Paraphrase.
Step 5: Then, I clicked on the Paraphrase button, and new text popped out on the right side.
I clicked Accept, and the issues were fixed.
I clicked Upgrade.
Instantly, the first thing I noticed was unlimited proofreading, paraphrasing, and translating. No more cut-offs.
Now I could choose from seven different paraphrasing styles— Standard, Formal, Academic, Casual, Shorter, Longer, and Easier.
One more thing: privacy mode.
When I turned it on, none of my input was saved or sent to external APIs like ChatGPT.
FAQs
How Do AI Grammar Checkers Work?
Paste or type your text, click “check,” and it highlights errors. Then I accept suggestions individually. Some tools offer explanations, showing why each correction matters.
Are AI Grammar Checkers Free?
Many AI grammar checkers offer free versions. You can use them without signing up, but they may limit text length or features. Upgrading gives full access.
Can AI Grammar Checkers Replace a Human Editor?
It’s great for catching errors fast. But it lacks context awareness. For nuanced writing like academic papers or novels, a human editor is still better.
Are AI Grammar Checkers Always Accurate?
They catch common errors with ~98% accuracy for grammar and punctuation. Still, context matters. Always double-check suggestions for tone and flow.
Do AI Grammar Checkers Have Limits?
Free tiers often limit text length per check, frequency, or access to advanced features like style suggestions or unlimited submissions.
Do AI Grammar Checkers Support Different English Dialects?
Yes—many tools let you switch between American, British, Canadian, and Australian English. This ensures spelling and style match your region.
Bottom Line
I tested and used all 15 grammar checkers myself, not just for features but for how they actually perform.
I looked at word limits, speed, and whether I could fix everything with one click. Some tools stood out with extra features that made writing smoother.
These are the ones I’d actually use.
I hope this blog was helpful!
