Free Grammar Checker Online

Nothing makes you lose credibility faster than a grammar mistake. Feel confident in everything you write with ProWritingAid’s AI-powered grammar and style checking.

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Why do I need to grammar check my work?

Good grammar and well-structured sentences help your reader follow your ideas more easily so they connect with what you’re saying.

As a writer, your priority is effective communication

Whether you’re an author, business professional, blogger, or student, you want to get your ideas out of your head and into your reader’s. The best way to do this? Clear, well-constructed writing.

Polished writing is a sign that you have put in time and effort

Grammar errors distract your reader, and make it look like you haven’t bothered to take the time re-read and perfect your work. In other words, your reader thinks you just don’t care.

A great online grammar checker won’t just show you your mistakes

It’ll help you learn about your writing. Knowing your own quirks, habits, and common errors helps you become a better writer. That’s why ProWritingAid goes beyond great grammar checking.

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Passive voice screenshot

What kinds of grammar mistakes can software highlight?

English grammar isn’t easy, but the grammar report will help you zero in on key embarrassing mistakes.

Spelling Errors

Spelling mistakes are highlighted red in your text. If you click the word, you’ll be shown a list of suggested corrections.

Spelling errors screenshot

Commonly Confused and Misspelled Words

The software has also been programmed with a list of the most commonly confused words in the English language and will use the structure of the sentence to help you figure out when you have the wrong usage.

Misspelled words screenshot

Grammar Errors

Grammar can be a bit of a minefield, so we highlight all potential issues in blue. Perfect grammar is hard and there are so many ways to slip up.

Do you have subject—verb agreement? Did you write "it’s" when you really meant "its"? Have you accidentally written a sentence fragment?

ProWritingAid’s grammar corrector will catch errors as you write so you can make sure no grammatical mistakes slip through.

Grammar corrector screenshot

Punctuation Mistakes

How many times have you been tripped up by comma splices? Or semi-colons? Or apostrophes? A good punctuation corrector will help you learn the ins and outs of punctuation rules.

ProWritingAid’s suggested changes will always be accompanied by an explanation to help you understand the rules so that you don’t make the same mistake next time.

Punctuation Mistakes screenshot

What other common writing errors can I fix with a good grammar checker software?

Here are 8 of the most common English writing issues we can help you with:

  • Passive Voice
    Passive screenshot

    When you write in the passive voice, you make your writing less direct. Your reader has to wait until the end of the sentence to see who is completing the action. That means they’re missing vital information upfront, diluting your meaning.

    Automatically re-phrase your sentences in the active voice.

  • Hidden Verbs
    Hidden verbs screenshot

    Hidden verbs are a marker of indirect or weak writing. These are phrases where you’ve replaced a more powerful verb with a weaker verb + noun combination.

    Instead of writing that you’ll "make a decision," give your reader confidence by telling them that you will "decide" on something. This both cuts down the number of words your reader has to get through to reach your meaning and makes you sound more authoritative.

  • Redundant words
    Redundant screenshot

    Ever been distracted when a writer has said the same thing twice? Redundant words and phrases are when you use two synonyms when one would do—like "past history" or "true facts." This just creates noise in your writing. You want to avoid unnecessary words wherever possible.

  • Intricate vocabulary and jargon
    Jargon screenshot

    Complex ideas don’t always require the most complex words. In fact, if you’re writing something complicated, it’s best to focus on making your writing itself as simple as possible so the ideas shine through. The software will highlight jargon and complex words when there are simpler alternatives available.

  • Repeats
    Repeats screenshot

    Repeated words are tedious for your reader, and they often signal places where you could add more descriptive detail or move on to another point.

    The repeats report lets you see words that have been used too many times so that you can add more variety to your text.

  • Transition Words
    Transition screenshot

    Strong non-fiction writing uses one transition per four sentences. In other words, 25% of your sentences should start with a transition.

    Transitions are words like "additionally," "lastly," "contrastingly," and "consequently" that show relationships between ideas. They’re important in all kinds of writing, but especially in essays where transition usage is often included in grading rubrics.

    It’s worth checking your transition percentages, not only to make sure you’re using enough transitions, but that you’re using them meaningfully.

  • Sentence Length Variation
    Sentence screenshot

    Varying your sentence length is vital to keeping your reader engaged and making your meaning clear. Too many long sentences and your writing will sound dull; too many short ones and it will feel choppy and incomplete.

    The most engaging writing has a variety of sentence lengths. Use a visualization of your text by sentence length so you know exactly which areas might need a bit more variety.

  • Repeated Sentence Starts
    Repeated screenshot

    Repeating the same word at the beginning of several sentences also makes your writing sound tedious. And it’s more common than you think. Change up your sentence structure to make your writing more compelling.

Passive screenshot

When you write in the passive voice, you make your writing less direct. Your reader has to wait until the end of the sentence to see who is completing the action. That means they’re missing vital information upfront, diluting your meaning.

Automatically re-phrase your sentences in the active voice.

To start seeing real improvement in your writing skills, you need to go beyond just correct grammar. Use an editing software to help you focus on your style, clarity, and structure, with thousands of useful rules and reminders programmed in.

What are the 20 writing reports?

ProWritingAid analyzes your writing and shows you how to make it better through 20 tailored reports.

It’s just like having a real-life writing coach guiding you

Some reports provide quick grammar suggestions that will allow you to polish up a short piece of writing. Other reports will go in depth and help you improve the strength and readability of your text.

Common errors screenshot
  • The Writing Style Report
  • The Realtime Report
  • The Grammar Report
  • The Style Report
  • The Overused Words Report
  • The Clichés and Redundancies Report
  • The Sticky Sentence Report
  • The Readability Report
  • The Sentence Length Report
  • The Pronoun Report
  • The Transition Report
  • The Consistency Check

What do online grammar checkers do?

Editing software is like your regular spell check, but with superpowers.

Comparison to Published Writing

Using artificial intelligence, the software has analyzed millions of published books and articles and discovered a wealth of information. Those professional writers know what they are doing and it’s a great way to learn.

Grammar Structures

The software is able to break down most sentences into their various parts and recognize if you are using a problematic grammatical structure or word choice. For example, if you use a plural noun followed by the singular form of a verb, a prompt will pop up suggesting a change.

Document Analysis

These suggestions are based around your text on its own. Have you consistently used US English, or have you jumped between US and UK English? Have you used the same word multiple times within the same paragraph so that it sounds repetitive and strange?

Like Microsoft Word’s spell checker, the online grammar checker shows suggestions to help you make your writing more accurate, correcting your spelling mistakes and punctuation errors as you write.

What type of content should I check?

You should check any text that will be read by someone else.

For business writers improves your:

  • emails
  • reports
  • pitches
  • cover letters
  • resumes
  • contracts
  • strategies
  • marketing copy

For creative writers improves your:

  • stories
  • articles
  • memoirs
  • blog posts
  • social posts
  • essays

For students improves your:

  • essays
  • lab reports
  • assignments
  • applications

Questions & answers

  1. Should I use a punctuation checker too?

    Yes! Punctuation acts like signposts in your writing. It helps your reader follow your ideas and understand your sentences. Punctuation checking is essential if you want your writing to be clean and clear.

    ProWritingAid has punctuation checking built in so you can do everything in one place. The grammar report will highlight any pesky misused commas, missing apostrophes, and more.

  2. Does editing software work as an essay checker for students?

    Yes! Better writing means better grades.

    Schools and universities around the world use editing software to help their students write better essays. Sloppy spelling and silly grammar mistakes lead to poor grades. A good spelling and grammar check means you will find errors before you hand your assignments in. Teachers love essays that are clean, clear, and polished.

  3. Can I track my editing progress as I go?

    The hardest part of editing is always knowing where to begin.

    It’s important to know what you are doing well and where you could improve at all stages. Good editing software points you toward the key changes that will have the biggest impact on your writing, while also acknowledging your wins.

    ProWritingAid’s goals show how you score against real-world targets for the key editing elements for your document type. Your scores change as you edit so you can monitor your progress in real time.

    If you’re unsure how to start improving your score for a certain goal, the handy information button has you covered with videos and articles.

  4. Is there software to compare my writing with my favorite author?

    ProWritingAid allows you to compare your writing to an author from your genre in areas like dialogue tags, conjunction starts, sentence length variety, and more.

    You don’t need to match your scores directly to Agatha Christie’s to write a good thriller, but it can be useful to see how successful writing breaks down in terms of writing technique. You’ll see where your favorite authors bend the rules, or notice which writing quirks help make their prose unique to them.

  5. Can I check for grammar mistakes in email? And on social media?

    Yes! You can use our grammar checking browser extensions (Chrome, Safari, Firefox, and Edge) to check your writing on nearly every website out there, like Facebook, Twitter, and Medium, as well as on web-based email providers like Gmail and Yahoo.

    Using the browser extensions, you’ll feel more confident that you are sharing error-free content every time you Tweet, share, or post


Feel confident in everything you write