10 Best Free Grammar Checker Online Tools in 2021

Whatever you’re thinking of writing, it’s always worth using a grammar checker tool. They help you find any grammatical and spelling errors, and some of the better ones will even help you to improve your style. This article will look at the 10 best free grammar checker tools to help give your writing that extra boost.

One thing worth remembering is that free grammar checker sites will usually come with limited features, as most will offer premium versions of their software.

However, the free versions are usually enough for someone who’s fluent in English to give their writing a check over.

Grammar checkers often have a range of features, including things like punctuation checker and grammar checker tools.

That said, don’t rely on them completely, as different websites will give different answers, and can often miss more nuanced mistakes that a person wouldn’t.

The 10 best free grammar checkers are:

  1. Grammarly
  2. ProWritingAid
  3. LanguageTool
  4. Online Correction
  5. Hemingway
  6. Paper Rater
  7. GradeProof
  8. Ginger Online
  9. WhiteSmoke
  10. Jetpack

Before we look at these sites in a bit more detail, it’s worth thinking about what to expect from a grammar checker tool.

Obviously it should always have punctuation corrector and grammar checker, but there are other things worth looking out for.

Here are the main things to consider when deciding which grammar checker tool is right for you:

Ease of use

Which grammar checker you choose will depend largely on its ease of use. After all, if you’re a competent writer who just wants a final check on their document, then you should choose a site that’s more in-depth.

Some grammar correctors also comment on things like redundancy, repetition, and sentence structure.

However, if you feel less confident about your writing ability then it can be helpful to choose a grammar checker tool with fewer features.

If you want to concentrate on the fundamentals of spelling and punctuation, then these will be much more helpful.

If you want to get an idea of what any of these free grammar checkers are like, look up some tutorials online.

Plenty of people have shared content that’ll help you get a feel for the software before you try it on your document.

Type of grammar checker tool

All grammar checker tools will be either online or offline services. Some might offer both, but this will usually only be the case if you purchase the premium version.

Most free grammar checkers will be online, or as browser or WordPress plugins.

The one you choose will depend largely on when and where you write.

Most people writing on a computer will probably have access to the internet all the time, but an offline grammar checker tool can often be helpful too.

The best free grammar checker for you will depend on where you plan to use it.

Most companies will offer their service across all major platforms, and many have integration for mobile devices.

It shouldn’t be a problem to find your favourite free grammar checker tool, but always check your device and OS is supported.


Getting the best free grammar checker with all the right features can be challenging, particularly if you’re looking for one with more in-depth writing statistics.

However, many free grammar checkers support a range of useful features that can help you improve your writing.

Along with spell check, punctuation corrector, and grammar checker tools, many sites will also offer things like plagiarism detector and comments on your writing style.

These can be very useful, but also very dangerous for the quality of your writing.

This is particularly true for something like a plagiarism detector. Almost all writers will want to check the originality of their content, but plagiarism detectors are often too good at their job.

It should then be your job to read through what it flags up and look out for less common uses of work you thought to be original content.

Integration with other software

Many of the best free grammar checker tools can be integrated into other software, which can be really helpful if you work in a cloud-based environment.

They basically become a hyped-up version of the original spell check, and can save you having to copy and paste your document into their service.

If you work on a particular word processor, make sure the grammar corrector you’re thinking of using supports it.

This should be the case if you use Google Docs or WordPress, but double check for things like Microsoft Office or WPS Office.

Similarly, most of the best grammar checkers offer plugins for all the major browsers such as Google Chrome, Mozilla Firefox, Opera, Safari, and Microsoft Edge.

The Best Free Grammar Check Tools 2021

Now that we’ve established what it is you should be looking for, you’ll have a much easier time deciding which is going to be the right one for you.

Here are the 10 best free grammar check tools, with a bit of information about their features.

1. Grammarly

Grammarly is probably one of the best-known online grammar and punctuation checker tools. It’s free to use, and offers grammar check plugins for Chrome, Safari, and Firefox.

It can correct over 150 types of mistakes, including checking sentence structure and repetition.

Grammarly also offers an explanation as to why you’ve made a mistake, which is very helpful for those looking to improve their writing. It’s a great free grammar checker tool for almost everyone.

10 Best Free Grammar Checker Tools

Grammarly app is available for iPhone and Android so you can correct grammar errors on your iPhone and Android devices. You can also install free Grammarly Windows 10 app on your PC or laptop.

2. ProWritingAid

ProWritingAid claims to offer not only top grammar checker tools, but also mentoring on your writing and style.

It can help you correct things like vagueness and voice, while obviously helping with your spelling and grammar.

The free version offers 19 reports on your writing and a 500-word limit, but there are premium versions if you like it.

Due to its extensive range of features, this is more suited to those looking for a more in-depth analysis of their writing.

3. LanguageTool

This is a great free grammar checker because it works in languages other than English.

LanguageTool can be a great help for those working on translation documents, as you can compare them side-by-side. The full version does require download, but you can have a free online trial first.

This is a great accessible tool for writers of all abilities, and it gives helpful and easy to see corrections.

While its user interface might be a bit basic, this can make improving grammar much easier.

4. Online Correction

This is a free online grammar checker tool, and highlights spelling, grammar, and structure errors in different colours.

This makes it easy to see where you make common mistakes, which is the first step to learning from them. It also offers punctuation corrector alongside.

Online Correction

Online Correction is simple and easy to use, and has an auto correct feature. This can be very useful, but also very damaging.

Sometimes it can infer the wrong meaning from something, so always check its suggestions before you auto correct.

5. Hemingway

Hemingway, This free grammar check tool comes as either a browser plugin or an app, meaning you can access it on most devices.

It scores your writing on its readability, which is obviously very useful.

Along with things like a punctuation corrector, this covers voice, flow, and style. However, this is more suitable for more experienced writers who are confident in their spelling and grammar.

6. Paper Rater

Paper Rater is an incredibly popular grammar check tool, and this is mainly because it also detects plagiarism.

It’s used by writers of all types, and offers spelling, grammar, and punctuation checks.

Many freelance writers recommend Paper Rater because of its massive catalogue of documents; it has over 10 billion! It’s less geared towards students, but it’s helpful for them too.

7. GradeProof

GradeProof is a very in-depth writing tool that checks all features of your writing, and is powered by AI.

It learns about your writing style, and so can offer more personalized comments. Writers of all levels will definitely benefit from this feature.

You can access a version of the free grammar checker online, but there’s also a premium version with more features.

If you find you like this grammar checker tool, then it’s definitely worth upgrading.

8. Ginger Online

Ginger Online looks a lot like Word, and so can be a good option for those used to this software.

You can write directly in the app, and then it automatically checks your work. It has both free and premium versions.

This is a great choice for writers of all levels, and both native and non-native speakers.

The premium versions come with plenty of helpful features to improve your writing.

You can download the best grammar checker app for Android, iPhone and iPad.

Ginger free download version is available for Windows 10, but It is not compatible with Mac OS. Mac users can use Safari or Chrome extension for checking writing text.

9. WhiteSmoke

This grammar checker also offers a punctuation corrector and builds a writing report.

It gives you a breakdown of your score and offers ways you can improve your writing.

WhiteSmoke is a good option for more experienced writers looking to pick apart their work for more complicated solutions.

It’s definitely one of the best free grammar checkers, so is worth looking into.

10. Jetpack

Jetpack is a plugin for WordPress that offers free grammar checker and punctuation corrector.

It helps to proofread your posts while you’re writing them, and prevents you from publishing silly mistakes.

It comes with a range of options for checking your work, and all of these are really accessible.

Jetpack is suitable for bloggers of all abilities, and is a great WordPress plugin.


These are the best free grammar check tools, and hopefully one will be suitable for your needs. Remember, this will largely be based on your writing ability, and what you need from a grammar checker.

If you find one you like, and plan on using it regularly, it’s definitely worth upgrading to a premium version.

These have so many more features that the free grammar checker tools, and will improve your writing massively.

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