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Essay Checker: Free Online Paper Corrector

Your Best Chance for an A+ Essay. Try Our Free Essay Checker Below.

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Why Should You Use a Free Essay Checker?

The simple answer? Good grammar is necessary, but it’s not easy. You've already done countless hours of research to write the essay. You don’t want to spend countless hours correcting it, too.

You'll get a better grade

Good grammar or its absence can determine if you get a good grade or a failing one. Impress your lecturer not just with how grammatically sound your writing is, but how clear it is and how it flows.

You'll save time

Essay writing can be a long and tedious process. ProWritingAid's essay checker saves you the hassle by acting as the first line of defense against pesky grammar issues.

You'll become a better writer

Essay writing is a particular skill and one that becomes better with practice. Every time you run your essay through ProWritingAid’s essay corrector, you get to see what your common mistakes are and how to fix them.

Good Writing = Good Grades

It’s already hard to know what to write in an essay. Don’t let grammar mistakes hinder your writing and prevent you from getting a good grade. ProWritingAid’s essay checker will help you write your best essay yet. Since the checker is powered by AI, using it means that grammar errors don’t stand a chance. Give your professors something to look forward to reading with clear, concise, and professional writing.

How Does ProWritingAid’s Essay Checker Work?

Your goal in essay writing is to convey your message as best as possible. ProWritingAid's essay checker is the first step towards doing this.

Get Rid of Spelling Errors

ProWritingAid’s essay checker will show you what it thinks are spelling errors and present you with possible corrections. If a word is flagged and it’s actually spelt correctly you can always choose to ignore the suggestion.

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Fix Grammar Errors

Professors aren’t fans of poor grammar because it interrupts your message and makes your essay hard to understand. ProWritingAid will run a grammar check on your paper to ensure that your message is precise and is being communicated the way you intended.

Get Rid of Punctuation Mistakes

A missing period or comma here and there may not seem that serious, but you’ll lose marks for punctuation errors. Run ProWritingAid’s paper checker to use the correct punctuation marks every time and elevate your writing.

ProWritingAid product image - punctuation student

Improve Readability

Make sure that in the grand scheme your language is not too complicated. The essay checker's built in readability report will show if your essay is easy or hard to read. It specifically zones in on paragraphs that might be difficult to read so you can review them.

What Else Can the Essay Checker Do?

The editing tool analyzes your text and highlights a variety of key writing issues, such as overused words, incohesive sentence structures, punctuation issues, repeated phrases, and inconsistencies.

ProWritingAid illustration- unnecessary word student

You don’t need to drown your essay in words just to meet the word count. ProWritingAid’s essay checker will help to make your words more effective. You'll get to construct your arguments and make sure that every word you use builds towards a meaningful conclusion.

Use more transition words in your essay

Transition words help to organize your ideas by showing the relationship between them. The essay checker has a built in Transition report that highlights and shows the percentage of transitions used in your essay. Use the results to add transitions where necessary.

ProWritingAid product image - student sentence variety

An engaging essay has sentences of varying lengths. Don’t bore your professor with long, rambling sentences. The essay checker will show you where you need to break long sentences into shorter sentences, or add more sentence length variation.

ProWritingAid product image - student passive voice

Generally, in scholarly writing, with its emphasis on precision and clarity, the active voice is preferred. However, the passive voice is acceptable in some instances. When you run your essay through ProWritingAid’s essay checker, you get feedback on whether you 'r e using the passive or active voice to convey your idea.

ProWritingAid illustration - power verb

There are academic specific power verbs like appraise , investigate , debunk , support , etc., that can add more impact to your argument by giving a more positive and confident tone. The essay checker will check your writing for power verbs and notify you if you have less than three throughout your essay.

ProWritingAid product image - repeats

It's easy to get attached to certain phrases and use them as crutches in your essays but this gives the impression of boring and repetitive writing. The essay checker will highlight your repeats and suggest contextually relevant alternatives.

ProWritingAid illustration - learn as you edit

Gain access to in-house blog reports on citations, how to write a thesis statement, how to write a conclusion, and more. Venture into a world of resources specific to your academic needs.

What Kinds of Papers Does ProWritingAid Correct?

No matter what you’re writing, ProWritingAid will adapt and show you where your edits are needed most.

  • Argumentative
  • Descriptive
  • Textual Analysis
  • Lab reports
  • Case studies
  • Literature reviews
  • Presentations
  • Dissertations
  • Research papers

Professors and students love using ProWritingAid

If you're an English teacher, you need to take a look at this tool - it reinforces what you're teaching, highlights strengths and weaknesses, and makes it easier to personalize instruction.

prowritingaid customer

Jennifer Gonzales

Only reason I managed to get an A in all my freshmen composition classes.

ProWritingAid customer

Chris Layton

Great tool for academic work. Easy to use and the reports and summary evaluation of your documents in several categories is very useful. So much more than spelling and grammar!

prowritingaid customer

Debra Callender

Questions & Answers

1. how do i use the essay checker online tool.

You can either copy and paste your essay in the essay checker field or upload your essay from your computer. Your suggestions will show once you enter text. You’ll see a number of possible grammar and spelling issues. Sign up for free to get unlimited suggestions to improve your writing style, grammar, and sentence structure. Avoid unintentional plagiarism with a premium account.

2. Does the essay checker work with British English and American English?

The essay checker works with both British English and American English. Just choose the one you would like to use and your corrections will reflect this.

3. Is using an essay checker cheating?

No. The essay checker won’t ever write the essay for you. It will point out possible edits and advise you on changes you need to make. You have full autonomy and get to decide which changes to accept.

4. Will the essay checker auto-correct my work?

The essay writing power remains in your hands. You choose which suggestions you want to accept and you can ignore those that you don’t think apply.

5. Is there a student discount?

Students who have an eligible student email address can get 20% off ProWritingAid Premium. Email [email protected] from your student email address to access your discount.

6. Does ProWritingAid have a plagiarism checker?

Yes! ProWritingAid’s plagiarism checker will check your work against over a billion web-pages, published works, and academic papers, so you can be sure of its originality. Find out more about pricing for plagiarism checks here .

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Find and fix grammar errors

Turn in your best work. Our smart proofreader catches commonly confused words, grammar issues, misspellings, and more.

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Improve the quality of your paper. Receive feedback on your main idea, writing mechanics, structure, conclusion, and more.

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What students are saying about us

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"Caught comma errors that I actually struggle with even after proofreading myself."

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check my essay grammar mistakes

"I find the suggestions to be extremely helpful especially as they can instantly take you to that section in your paper for you to fix any and all issues related to the grammar or spelling error(s)."

- Catherine R.

check my essay grammar mistakes

One, easy scan for grammar

Scan your paper to target common grammar mistakes such as punctuation errors, misused words, misspellings, and more. The EasyBib grammar checker will also help you build a more focused paper by finding and flagging text that could be improved.

Get started in three easy steps:

  • Upload or copy and paste your paper into the uploader.
  • Click “Check my paper.”
  • See how many grammar issues are flagged and review the suggested action for each.

With the EasyBib grammar checker, a polished paper is always within your reach.

Why is grammar such a big deal, anyway? 

Did your seventh-grade English teacher always nag you about your grammar? Did she send your papers back, covered in red ink? You may think that a few grammar mistakes aren’t the end of the world, but unfortunately, your teacher was right: technical errors can have a significant effect on your writing and academics.

It can be a hard pill to swallow, but  instructors and employers really do use the quality of your writing to judge your capabilities . If your work is full of grammar errors, you may wind up with a low grade. Beyond school, you could find yourself missing out on jobs or promotions.

As a student, you already know all about doing in-depth research and creating solid arguments for your papers. However, don’t overlook the importance of proofreading. Technical errors can jeopardize your credibility, and poor grammar and spelling may give your reader the impression that you don’t know what you’re talking about.

Cleaning up your grammar can help keep your academic career on track. Clear, concise writing shows off your great communication skills. An error-free paper  says you’re knowledgeable about the rules of grammar and also responsible enough to double-check your work for mistakes.

If grammar was never your strong suit, don’t worry. The EasyBib grammar checker can help you catch simple mistakes and polish your writing. Also, you can use the writing suggestions to help reinforce your understanding of grammar rules and ensure you express your ideas in the best ways possible.

check my essay grammar mistakes

Do I really need a grammar check? 

Spotting grammar mistakes can be tough. If you’ve been working on a paper for a while, identifying a mistake among a sea of 1,000+ words can feel like finding a needle in a haystack. If writing has always been a struggle, the task may seem almost impossible.

Consider this:  even professional writers have their work checked. It’s part of the professional writing process. We all want to present our best work, and getting an external review helps us to achieve that.

Whether writing is your strength or your weakness, you can still benefit from a paper review from a service like the EasyBib grammar checker.

My spell checker isn’t enough?

Millions of people already rely on the built-in spell checkers available in word processors. Those integrated proofreading tools can point out simple spelling and grammar errors . If you spell definitely as “definately,” it will let you know.

Online integrated checkers can catch typos, but they can’t help you do a proofreading and editing rewrite. They aren’t set up to spot complex grammar problems. Often, those spell checkers miss punctuation errors or problems with sentence structures. They may fail to spot misused words or correct the use of passive voice.

Tools like the EasyBib grammar checker offer more than a simple checkup. They help you restructure sentences for greater clarity and conciseness. They can also identify confusing or unclear sections.

If you struggle with run-on sentences or sentence fragments, these spelling and grammar checking tools are a must.

They can turn a paragraph like this:

“Don’t say another word whipered the teacher. Its too late for me, but it’s not for you! This book was entirely written by my mother. Take it and travel to london to find the librarian who can help you finding the treasure. It is really a very long and tiring trip, but I think you might be able to do it on your own..”

“Don’t say another word,” whispered the teacher. “It’s too late for me, but it’s not for you! This book was written by my mother. Take it to London to find the librarian who can help you find the treasure. It is indeed a long and tiring journey, but I think you can do it.”

Tools like the EasyBib grammar checker help clear up confusion and streamline paper that otherwise may not cut it in college. Instructors expect clear, concise, and grammatically correct writing. A grammar checker can provide in-depth support for your proofreading and editing needs.

Okay, I’m sold. How do I get started? 

Simply go to the top of this page and upload your paper into the EasyBib grammar checker and click “ Check my paper ” to begin.

The checker scans your paper  and provides personalized grammar suggestions. It will tell you how many errors were found and provide a suggested action for each one. From there, you can review the suggestions and decide how to shape your paper.

Here are a few things you should know about the EasyBib grammar checker:

  • The first 5 grammar suggestions are free!
  • If you want more than 5 suggestions, an EasyBib Plus subscription gives you full access.
  • The comprehensive checker screens for more than 400 of the most common grammar errors.
  • It flags grammar errors, spelling mistakes, misused punctuation, and more.
  • Each flagged error comes with an explanation and suggestion for correction.

If you’d like another pair of eyes to review your work, EasyBib Plus also comes with Expert Check. With this service, you can submit your paper to a live proofreader who will provide personalized suggestions online to improve your paper. Subscribers can upload up to 15 papers to Expert Check each month to get personalized comments on your main idea, conclusion & more for their papers.

Worried about plagiarism? After getting a grammar check, you can easily run a plagiarism check with just a few clicks. The plagiarism checker compares your paper to billions of sources and detects plagiarism. If the checker spots similar phrasing, it lets you know right away, so you can rephrase your words or use a direct quote.

Try it today! The EasyBib grammar checker is ready for you 24/7. What are you waiting for?

Visit www.easybib.com for more information on helpful EasyBib writing and citing tools.

For informational guides and on writing and citing, visit the EasyBib guides homepage .

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Yes. This tool checks not only grammar, but also spelling, punctuation, word choice, and even style.

This tool is for anyone who writes in English, from students and learners to professionals, teachers, and even proofreaders. After all, even native speakers of English aren't immune to mistakes.

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Slick Write

Check your grammar in seconds.

Slick Write is a powerful, free application that makes it easy to check your writing for grammar errors, potential stylistic mistakes, and other features of interest. Whether you're a blogger, novelist, SEO professional, or student writing an essay for school, Slick Write can help take your writing to the next level. Curious? See why Slick Write is the best. Try the interactive demo , or check your own document . No software download or installation is required.

Why Slick Write?

The grammar checker is lightning fast

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English is a difficult language, so using correct grammar and diverse vocabulary will set you apart from the crowd. Using good sentence structure and wording improves your content's impact and readability while building your readers' trust. Slick Write goes beyond spell checking to teach you the habits of effective writers. How does your writing rate?

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The job market is competitive. Gain an advantage, impress employers, and land more interviews by demonstrating professionalism and superior communication skills on your resumé.

Get the extensions

Using an extension is the easiest way to submit your work to Slick Write. They are available for Chrome and Firefox .

Bust your writer's block, and create new metaphors by playing the word association game . To begin, type a word or phrase in the box below, and hit enter. To quickly find associations for your own text, highlight a word or phrase in it, and use the toolbox popup.

The associator learns contextual word associations from real literature, so it may return offensive results.

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  • Submission Limit There is a limit of 200,000 characters, which is approximately 30,000 words. Anything longer should be submitted in smaller chunks, or it will be automatically trimmed.
  • No document It looks like you forgot to enter your document. Paste it in and try again.
  • Structure This tab shows sentence structure within the context of the document. Hover over a sentence to see its word count. Select a word or phrase, or click a sentence to get more information.
  • Quotes This tab shows your quotations highlighted as Slick Write sees them.

More information »

  • Sentence type flow Pieces with good flow will make use of all four sentence types, varying them to keep the reader interested.
  • Sentence length flow Sentence length is indirectly related to sentence type, and is a good indicator of flow. Flow can be altered by adding, removing, lengthening, shortening, combining, or splitting sentences. Long sentences will be indicated by a red line on the graph. Sentences that flow poorly with their surroundings will be orange, and the source of the problem can often be found in a nearby sentence.
  • Word length flow Word length is a minor contributor to overall flow, but even minor variations are signs of good rhythm.
  • Passive Voice Index This is a measure of how frequently the passive voice is used. Consider revising your document if it scores over 100.
  • Prepositional Phrase Index This is a measure of how frequently prepositional phrases are used. Consider revising your document if it scores over 100.
  • Average sentence length Sentence length is a major contributor to the level of education required to read a body of text.
  • Sentence length standard deviation This is a measure of the amount of variation in the length of a text's sentences. In texts that have broad appeal, this tends to fall between 50 and 90% of the average sentence length. You can increase this number by making long sentences longer, and short ones shorter.
  • Sentence deviation to length ratio This is a measure of the sentence variety, and a major contributor to flow. Most novels score between 0.5 and 0.9, and popular ones often score near the high end of the range. You can increase this number by making long sentences longer, and short ones shorter.
  • Just the stats preset Use this preset when you're only interested in the stats tab. Critique and Flow will be hidden.
  • Honesty preset This preset checks for common indicators of deception, either by lying or omission, and is based on the findings of this study . Areas with high concentrations of these indicators should be viewed with skepticism. Note that the presence or absence of these indicators does not guarantee that a statement is true or false, and that the study was done on spoken communications, so it might be more applicable to interviews and speeches. As always, use your brain.
  • Doubled words A word used twice in a row may be a typo.
  • Commonly confused words This will check for the internet's most frequently confused words and notify you if it looks like you misused one. It is experimental and probably the least reliable feature. Consult a dictionary when necessary.
  • Sentences starting with the same word A word should not be used to start more than one sentence in a single paragraph.
  • Misplaced conjunctions It is considered poor style to place coordinating conjunctions at either end of a sentence. Placing a subordinating conjunction at the end of a sentence is against the rules.

It is said that one day, passive voice will bring weakness to your prose.

More information » Even more information »

  • Overwriting Words like "very" and "really" make sentences wordier and weaken your message. These can be deleted in almost all cases without affecting the meaning of the sentence.
  • Abstract words Abstract words lack specificity and overusing them can make even simple concepts difficult to understand. There are times when abstract words are desirable or even necessary; it would be difficult to write about math or programming without mentioning variables or functions, but you should use more specific terms whenever possible.
  • Wordy and redundant phrases These phrases make your writing more difficult to understand. In most cases, they can be replaced with one or two words, or even deleted.
  • Legalese These antiquated, arcane words and phrases will make your writing look like a contract.
  • Double negatives Double negatives are almost always poor style.
  • Adverbs They aren't bad in small quantities, but consider revising your document if more than 5.5% of its words are adverbs. Adverbs ending in "-ly" are considered the worst offenders.
  • Adjectives They aren't bad in small quantities. A few of the words on this list can also function as other parts of speech. You have been warned.
  • Contractions In formal writing, the use of contractions is considered a fault.

The boxer decked his opponent.

  • Profanity Profanity should not be used in formal writing outside of direct quotations.

The critic's scathing review hit the nail on the head .

  • Similes Similes and metaphors should be used sparingly. This option will detect most common types of similes.
  • "Said" replacements Some people think that these substitutes for "said" are weak or obnoxious, especially if overused.

Her dress was long , and it touched the floor.

Her long dress touched the floor.

  • Gender-specific pronouns Avoid using gender-specific pronouns in formal writing when the subject's gender is unknown.
  • Weasel words Like abstract words, weasel words and phrases lack specificity. At best, they convey uncertainty. At worst, they can be used to "weasel out" of telling the truth in a straightforward manner. When checking a document that is speculative by nature, you might want to disable this detector.
  • Third person pronouns According to this study , high concentrations of third person pronouns may indicate deception.
  • Bias language These words and phrases often show the author's bias.
  • Uncommon words Uncommon words will increase the document's reading difficulty.

Hot peppers burn my mouth, but I eat them anyway .

Since burritos taste good , I like to eat them.

  • Sentence fragments A sentence must have at least one noun and one verb. Anything that does not is a fragment, and if it occurs outside of dialog, it should probably be rewritten.
  • Long sentences Long sentences tend to be more difficult to read, making them good candidates for trimming or splitting. Alternatively, parallelism may be used to improve their readability, though this will not decrease the ARI score.
  • Success with Style: Using Writing Style to Predict the Success of Novels
  • Grammar Girl For your obscure writing questions
  • Basic Prose and Style Mechanics An excellent, concise resource
  • Television Tropes & Idioms Tricks of the trade
  • Writing Realistic Injuries An invaluable article for anyone who writes action or horror
  • Online Etymology Dictionary Learn the history of English words
  • Scribophile Discuss the finer points of writing with other novelists
  • Suggestions from the official See Sharp Press blog Learn about the mistakes that will keep your novel from being published.
  • Smashwords Easy ebook distribution for indie authors
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  • Creative Writing Prompts and Exercises Spark your creativity
  • RhymeZone A popular rhyming dictionary
  • Seventh Sanctum Name generators and more
  • Apache OpenOffice The best free office software
  • Literature & Latte Makers of the popular Scrivener editor

Did you find a bug? Do you want us to add a new feature? We would love to hear about it.

Free AI Proofreader

Submit work you’re proud of with scribbr’s academic proofreading tool.

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AI Proofreader

The only proofreading tool configured to your academic writing needs

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We’ve been editing academic texts for 10+ years. With permission, we’ve used 1000s of academic documents to train the tool specifically to correct academic writing.

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Trained by top-notch native English editors

2% of editors are accepted at Scribbr. That’s a lower acceptance rate than Harvard (3%). The tool has been trained by these editors to look for common mistakes in academic writing.

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Because it’s specialized in academic texts, Scribbr’s proofreading tool offers higher accuracy than other tools. It goes beyond checking grammar, identifying spelling, punctuation, and other common mistakes in academic writing.

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It keeps your formatting intact

All corrections will be done automatically in your document. Keeping your format intact. No copy-pasting is needed!

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Upload unlimited documents and get free assessment reports for every document. The report will show you how many and what kind of mistakes you’ve made.

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How it works, upload, check, and correct all your writing assignments.

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2. The proofreader processes your document

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3. Accept or reject tracked changes

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4. Earn higher grades on your assignments

Never again get a lower grade because of pesky grammar mistakes

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Frequently asked questions

Our AI Proofreader has been trained on academic texts. It also addresses commonly confused words, and it’s more accurate than Word’s autocorrect feature. Word’s autocorrect feature usually operates on a word level, whereas our AI Proofreader can proofread on the sentence and, to an extent, even the paragraph level. Because it’s more accurate and fixes more than just grammar mistakes, our AI Proofreader identifies and corrects more mistakes overall. Furthermore, because you check your document with our AI Proofreader after you’ve finished writing it, your workflow won’t be interrupted.

Rest assured: Your documents are safe. The document you upload is deleted immediately after it’s been processed by our AI Proofreader, and your processed document will automatically be deleted from our servers after 12 months. If you’d like to delete the stored copy of your document sooner, you can do so manually through your user profile at any time. For more information, please consult our articles on how we ensure the security of your documents.

For now, the AI Proofreader only corrects based on the conventions of US English. We will add other dialects at a later stage.

You can only upload .docx (Word) files to the AI Proofreader.

Absolutely! The AI Proofreader is particularly useful for non-native English speakers, as it can detect mistakes that may have gone unnoticed.

There’s no need for any downloads! You can use our AI Proofreader right in your web browser. Just upload your document and sit back; you’ll receive a revised version of your document within 10 minutes.

No; the AI Proofreader currently focuses on grammar, spelling, and punctuation errors. If you’re interested in detecting any potential plagiarism in a document, we recommend that you consider our Plagiarism Checker . The AI Proofreader is included for free in that service.

Absolutely! Every change suggested by the AI Proofreader is indicated as a tracked change in Word. You can decide which changes to accept or reject in your document, and, if you’re feeling confident, you can even accept all of the changes with just one click.

The cost is $9.95 per document, no matter the length. You won’t pay more based on the number of words or characters. Our AI Proofreader is ideal for academic papers and dissertations!

The exact time depends on the length of your document, but, in most cases, the proofreading will be completed within a maximum of 10 minutes.

No.To make sure that your reference list isn’t disrupted, we’ve implemented suppression rules in our model.

No. You can, however, get a free report that tells you exactly how many and what kinds of mistakes there are in your document.

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Grammar Checker: Correct Writing Grammar For Free

Use our free grammar checker to scan your text for any and all mistakes. This free online grammar corrector highlights what you need to improve upon. Get checking today!

Grammar Checker: Correct Writing Grammar For Free

Run a Free Grammar Check Online Using Our Tool

Among all the grammar checkers online, our tool proved to be the most intuitive and accurate. It only requires you 3 steps to complete online grammar check for free:

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Paste any document or text that you need to have checked for grammar mistakes into the input box.

Our free online grammar checker will highlight any grammatical mistakes, spelling errors, or things that can be improved.

Now you can click on the highlighted word or phrase, and see exactly what suggestion was given.

Important notice

Note that the text you provided must be under 400000 characters. Otherwise, our grammar tool won't be able to process it.

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StudyCrumb’s Grammar Checker Filled With Benefits

Using our grammar checker online can get you loads of benefits! After all, it isn't all about fixing words and providing an all-encompassing professional grammar check.

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Our online free grammar corrector does not overlook the "big picture" of meaning in your text. It will help you create a wholesome cohesive work.

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Learn from AI that knows all the how's and why's of good writing. Online grammar editor can show you what you should write to make your text even better.

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Now you can forget about the daunting task of putting an apostrophe or comma in the right place. This free grammar fixer website will do it for you for free.

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StudyCrumb's sentence grammar checker can showcase all commonly confused words and replace them with what you need.

Need Expert Help With Grammar Check?

StudyCrumb offers you much more than a content grammar checker online. We gathered the best specialists who can create an error-free paper based on your needs.

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Backed by qualified writers, we provide unique academic papers tailored to clients specific requirements. Have an expert compose a customized paper and cope with grammar from the ground up.

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Take your writing to a whole new level with our editing and proofreading services. Our academic proofreaders will check grammar and polish your writing according to all collegiate standards.

Why Choose StudyCrumb

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Options of Our Free Writing Checker

So, what exactly can you do with our free online writing checker? It's a neat little handy tool that can show what must be fixed in your text, for sure. It highlights your mistakes, yes. But what do those highlights mean? Here's a quick description.

If your word is colored red, then an online writing checker found some kind of a misspelling. Click on it to find possible options. Choose a new word to replace your mistake with. It will be fixed automatically after that.

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This option presents tons of choices for you. From a typographical error where your word is of the wrong case to orthographic with a punctuation mark missing. Once again, you'll have to click it to find out what is what.

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Other Tools You May Like

StudyCrumb offers you more than just an online grammar checker. We’ve designed a whole bundle of free writing tools that can improve your academic experience. Check them out below!

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All you have to do is type in or paste your text below this instruction and click Check Grammar to get all the results. Click on the highlighted spelling error or grammar improvements for more options.

Purdue Online Writing Lab Purdue OWL® College of Liberal Arts

Finding Common Errors

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Welcome to the Purdue OWL

This page is brought to you by the OWL at Purdue University. When printing this page, you must include the entire legal notice.

Copyright ©1995-2018 by The Writing Lab & The OWL at Purdue and Purdue University. All rights reserved. This material may not be published, reproduced, broadcast, rewritten, or redistributed without permission. Use of this site constitutes acceptance of our terms and conditions of fair use.

Proofreading is primarily about searching your writing for errors, both grammatical and typographical, before submitting your paper for an audience (a teacher, a publisher, etc.). Use this resource to help you find and fix common errors.

Here are some common proofreading issues that come up for many writers. For grammatical or spelling errors, try underlining or highlighting words that often trip you up. On a sentence level, take note of which errors you make frequently. Also make note of common sentence errors you have such as run-on sentences, comma splices, or sentence fragments—this will help you proofread more efficiently in the future.

  • Do not solely rely on your computer's spell-check—it will not get everything!
  • Trace a pencil carefully under each line of text to see words individually.
  • Be especially careful of words that have tricky letter combinations, like "ei/ie.”
  • Take special care of homonyms like your/you're, to/too/two, and there/their/they're, as spell check will not recognize these as errors.

Left-out and doubled words

Read the paper slowly aloud to make sure you haven't missed or repeated any words. Also, try reading your paper one sentence at a time in reverse—this will enable you to focus on the individual sentences.

Sentence Fragments

Sentence fragments are sections of a sentence that are not grammatically whole sentences. For example, “Ate a sandwich” is a sentence fragment because it lacks a subject.

Make sure each sentence has a subject:

  • “Looked at the OWL website.” is a sentence fragment without a subject.
  • “The students looked at the OWL website.” Adding the subject “students” makes it a complete sentence.

Make sure each sentence has a complete verb.

  • “They trying to improve their writing skills.” is an incomplete sentence because “trying” is an incomplete verb.
  • “They were trying to improve their writing skills.” In this sentence, “were” is necessary to make “trying” a complete verb.

See that each sentence has an independent clause. Remember that a dependent clause cannot stand on its own. In the following examples, green highlighting indicates dependent clauses while yellow indicates independent clauses.

  • “ Which is why the students read all of the handouts carefully .” This is a dependent clause that needs an independent clause. As of right now, it is a sentence fragment.
  • “ Students knew they were going to be tested on the handouts, which is why they read all of the handouts carefully .” The first part of the sentence, “Students knew they were going to be tested,” is an independent clause. Pairing it with a dependent clause makes this example a complete sentence.

Run-on Sentences

  • Review each sentence to see whether it contains more than one independent clause.
  • If there is more than one independent clause, check to make sure the clauses are separated by the appropriate punctuation.
  • Sometimes, it is just as effective (or even more so) to simply break the sentence into two separate sentences instead of including punctuation to separate the clauses.
  • Run on: “ I have to write a research paper for my class about extreme sports all I know about the subject is that I'm interested in it. ” These are two independent clauses without any punctuation or conjunctions separating the two.
  • Edited version: " I have to write a research paper for my class about extreme sports, and all I know about the subject is that I'm interested in it ." The two highlighted portions are independent clauses. They are connected by the appropriate conjunction “and,” and a comma.
  • Another edited version: “ I have to write a research paper for my class about extreme sports. All I know about the subject is that I'm interested in it .” In this case, these two independent clauses are separated into individual sentences separated by a period and capitalization.

Comma Splices

  • Look closely at sentences that have commas.
  • See if the sentence contains two independent clauses. Independent clauses are complete sentences.
  • If there are two independent clauses, they should be connected with a comma and a conjunction (and, but, for, or, so, yet, nor). Commas are not needed for some subordinating conjunctions (because, for, since, while, etc.) because these conjunctions are used to combine dependent and independent clauses.
  • Another option is to take out the comma and insert a semicolon instead.
  • Comma Splice: “ I would like to write my paper about basketball , it's a topic I can talk about at length .” The highlighted portions are independent clauses. A comma alone is not enough to connect them.
  • Edited version: “ I would like to write my paper about basketball because it's a topic I can talk about at length .” Here, the yellow highlighted portion is an independent clause while the green highlighted portion is a dependent clause. The subordinating conjunction “because” connects these two clauses.
  • Edited version, using a semicolon: “ I would like to write my paper about basketball ; it’s a topic I can talk about at length .” Here, a semicolon connects two similar independent clauses.

Subject/Verb Agreement

  • Find the subject of each sentence.
  • Find the verb that goes with the subject.
  • The subject and verb should match in number, meaning that if the subject is plural, the verb should be as well.
  • An easy way to do this is to underline all subjects. Then, circle or highlight the verbs one at a time and see if they match.
  • Incorrect subject verb agreement: “ Students at the university level usually is very busy.” Here, the subject “students” is plural, and the verb “is” is singular, so they don’t match.
  • Edited version: “ Students at the university level usually are very busy.” “Are” is a plural verb that matches the plural noun, “students.”

Mixed Construction

Read through your sentences carefully to make sure that they do not start with one sentence structure and shift to another. A sentence that does this is called a mixed construction.

  • “ Since I have a lot of work to do is why I can't go out tonight .” Both green highlighted sections of the sentence are dependent clauses. Two dependent clauses do not make a complete sentence.
  • Edited version: “ Since I have a lot of work to do , I can't go out tonight .” The green highlighted portion is a dependent clause while the yellow is an independent clause. Thus, this example is a complete sentence.

Parallelism

Look through your paper for series of items, usually separated by commas. Also, make sure these items are in parallel form, meaning they all use a similar form.

  • Example: “Being a good friend involves listening , to be considerate, and that you know how to have fun.” In this example, “listening” is in present tense, “to be” is in the infinitive form, and “that you know how to have fun” is a sentence fragment. These items in the series do not match up.
  • Edited version: “Being a good friend involves listening , being considerate, and having fun.” In this example, “listening,” “being,” and “having” are all in the present continuous (-ing endings) tense. They are in parallel form.

Pronoun Reference/Agreement

  • Skim your paper, searching for pronouns.
  • Search for the noun that the pronoun replaces.
  • If you can't find any nouns, insert one beforehand or change the pronoun to a noun.
  • If you can find a noun, be sure it agrees in number and person with your pronoun.
  • “ Sam had three waffles for breakfast. He wasn’t hungry again until lunch.” Here, it is clear that Sam is the “he” referred to in the second sentence. Thus, the singular third person pronoun, “he,” matches with Sam.
  • “ Teresa and Ariel walked the dog. The dog bit her .” In this case, it is unclear who the dog bit because the pronoun, “her,” could refer to either Teresa or Ariel.
  • “ Teresa and Ariel walked the dog. Later, it bit them .” Here, the third person plural pronoun, “them,” matches the nouns that precede it. It’s clear that the dog bit both people.
  • “Teresa and Ariel walked the dog. Teresa unhooked the leash, and the dog bit her .” In these sentences, it is assumed that Teresa is the “her” in the second sentence because her name directly precedes the singular pronoun, “her.”

Apostrophes

  • Skim your paper, stopping only at those words which end in "s." If the "s" is used to indicate possession, there should be an apostrophe, as in “Mary's book.”
  • Look over the contractions, like “you're” for “you are,” “it's” for “it is,” etc. Each of these should include an apostrophe.
  • Remember that apostrophes are not used to make words plural. When making a word plural, only an "s" is added, not an apostrophe and an "s."
  • “ It’s a good day for a walk.” This sentence is correct because “it’s” can be replaced with “it is.”
  • “A bird nests on that tree. See its eggs?” In this case, “its” is a pronoun describing the noun, “bird.” Because it is a pronoun, no apostrophe is needed.
  • “Classes are cancelled today” is a correct sentence whereas “Class’s are cancelled today” is incorrect because the plural form of class simply adds an “-es” to the end of the word.
  • “ Sandra’s markers don’t work.” Here, Sandra needs an apostrophe because the noun is a possessive one. The apostrophe tells the reader that Sandra owns the markers.

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