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Free Online Proofreader

Perfect your writing with ProWritingAid's proofreading tool. Try it now for polished, error-free text.

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Our writing tool goes beyond proofreading

In addition to basic proofreading, ProWritingAid has over 25 tailored reports to help improve your writing.

Readability

Redundancies

Sentence structure

Overused words

Transition use

Inclusive language

Homonym confusion

Sentence length variety

Business jargon

Predicted read time

...and more!

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

Some reports provide quick grammar suggestions. Others go in depth and help you improve the strength and readability of your text.

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Proofreader FAQs

1. does prowritingaid autocorrect.

ProWritingAid provides recommendations so you can identify and correct writing errors. You have complete control over whether to accept or ignore these suggestions.

2. Can I proofread emails and social media posts?

Yes. As a matter of fact, ProWritingAid's browser extensions work across almost all websites and online apps, including Gmail, LinkedIn, and Google Docs.

3. How can ProWritingAid help?

ProWritingAid helps with a variety of writing tasks. It corrects grammar, spelling, and punctuation, while also enhancing vocabulary variety and more.

4. Is ProWritingAid free?

A free account allows you to edit up to 500 words at a time. If you want to edit larger documents, upgrading is necessary. You can find more information on our pricing page .

5. Can ProWritingAid paraphrase?

Yes! You can rewrite sentences with a single click using Rephrase. See multiple options to reword any sentence.

6. Does ProWritingAid have a plagiarism checker?

Yes! ProWritingAid’s plagiarism checker will check your work against over a billion webpages, 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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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

Customizable feedback to suit your style

We do not redistribute your documents

Add impact to reports

Improve your grades

Engage your audience

Inspire confidence

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?

Improve your resumé

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
• Duotrope Find and learn about publishers
• CreateSpace
• Amazon Kindle Direct Publishing
• 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.

Get your paper proofread by experts

Improve your paper with custom suggestions.

• Expert Check

Strengthen your writing

Give your paper an in-depth check. Receive feedback within 48 hours from writing experts on your paper's main idea, structure, conclusion, and more.

Find and fix grammar errors

Don't lose points over small mistakes. Our smart proofreader checks for grammar and writing mistakes so that you don't have to.

Check for unintentional plagiarism

Check your paper for unintentional plagiarism against thousands of sources.

What students are saying about us

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

- Natasha J.

"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.

Clean up your writing and fix mistakes with EasyBib online proofreading tools

It doesn’t matter if you’re a writing superstar or a beginner learning the basics—everyone can benefit from good proofreading.

• Begin by uploading your paper to the proofreading tool to start an automatic scan for spelling and grammatical errors you may have missed. You’ll also receive suggestions to help streamline your writing.
• For important papers that need extra attention, submit your drafts to Expert Check for personalized feedback from a writing expert.
• Finally, try the automatic plagiarism check for help with catching missing citations and accidental plagiarism.

Using these online proofreading services can help you build your best paper possible.

What do online proofreading tools do? 

Simple  online spell checkers only search for basic mistakes. Online proofreading tools go further. An initial EasyBib proofreading scan can catch complex errors like:

• Subject-verb disagreement
• Punctuation errors
• Sentence fragments
• Missing commas
• Run-on sentences
• Misused pronouns
• Word choice errors

Once your proofreading scan is complete, you review each card to see what error was found, an explanation of why it was flagged, and suggestions on how to correct it. This helps ensure that you understand and learn from the suggestion as you edit and improve your paper .

Custom feedback from experts 

Online tools are a great resource, but they can’t do it all. English is a tricky language, and sometimes, these tools can’t give you all the answers you need. To provide the specific feedback you need in those cases, there’s Expert Check from EasyBib Plus.

Expert Check provides a personalized, in-depth review of your writing by a live, professional proofreader. You can submit a paper at any time to receive detailed feedback on elements like:

• Development
• Organization
• …and other components

You’ll be given scores on these different elements, explanations of what was great, and suggestions on how to revise any areas that could be improved. It only takes  48 hours to submit a paper and receive a detailed proofreading report.  An EasyBib Plus subscription includes up to 15 Expert Checks each month.

Using Expert Check and the automatic EasyBib proofreading tool can save you time and help you turn in your best paper!

Why should I get my paper proofread? 

People may overlook an occasional typo or grammatical error in a casual text or email, but in academic writing, the standards are much higher. Small mistakes can affect your academic career in a big way.

College instructors expect your work to be clear, concise, and technically correct. That’s why proofreading is so important.

• Unclear, poorly written work sends a message that you aren’t giving your classwork your best effort.
• Technical errors can even send the message that you’re not ready for college-level work.
• Work that is perceived as rough will likely get low marks, affecting your class grade.

As a result, bad writing can cause your grades and your academic reputation to suffer. If you’re hoping for internships, mentorships, or letters of recommendation, turning in poorly done work can lead to losing out on valuable opportunities.

There’s no doubt that papers take a lot of effort to write. A stellar essay requires a plan, an outline, and research. No wonder so many of us feel burned out when a first draft is finished. It’s tempting to immediately submit an essay as soon as it’s finished so you can forget about it. However, taking a moment to do some proofreading can be a literal grade saver.

Luckily, you can do an online check of your paper using EasyBib proofreading tools.

Why use EasyBib online proofreading tools? 

Having a resource such as the EasyBib proofreading tool is like having a personal tutor you can carry in your pocket. It’s available to help with checking your paper any time of the day or night.

It will also give you honest, helpful feedback without any judgement. Best of all, you can rely on EasyBib proofreading tools over and over again—there’s no limit to how many papers or revised drafts you submit.

Here’s a summary of everything EasyBib proofreading tools can do:

• Look for 400+ of the most common grammatical errors.
• Check your paper day or night.
• Allow you to upload an unlimited number of papers.
• Look beyond typos to find ways to improve your paper’s writing flow and style.
• Provide feedback that is judgement free.

Help! It’s not just proofreading, I’m also terrible at citing sources.

If you struggle with citations, you’re not alone. Citing sources is often students’ least favorite task. But, failing to cite your sources properly can damage your paper’s credibility. It can even lead to getting your essay flagged for plagiarism.

The EasyBib proofreading tool also has an option to  scan your paper for unintentional plagiarism . If there is duplicate text online, the tool points it out for you to rewrite or to cite it as a direct quote. There are also EasyBib citation tools that can help you create in-text citations and build your reference or works cited page.

I’m a student on a budget. I can’t afford a personal tutor or private proofreader. What are my options? 

If you need a final proofread before you submit your essay but don’t want to look through a freelance marketplace, a subscription to EasyBib Plus can help. It’s free to upload a paper to the online proofreading tool, and the first five suggested grammar corrections are available for free.

EasyBib Plus also offers  online plagiarism scans and Expert Check proofreading by a professional proofreader. In summary, a subscription to EasyBib Plus unlocks a full suite of proofreading tools to help you turn in an error-free paper every time. You can sign up for a free 3-day trial or enroll in a low-cost monthly subscription. *

*See Terms and Conditions

What’s the bottom line when it comes to proofreading? 

Proofreading is an important part of the writing process. Spelling and grammatical errors can tank your grade and put your GPA at risk. Unintentional plagiarism can destroy your academic career. Don’t let it happen to you!

Using online proofreading ensures that your work gets an assessment that strengthens your writing and makes it shine. EasyBib proofreading tools help you turn in your best work. Sign up online for a free three-day proofreading trial today! *

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 .

• AI Detector
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Proofreading Tool

Proofread your papers with a proofreading tool.

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Proofreading Tool - Essay Checker & Proofreader | Grammica

Essay Checker  

Our Professional proofreading tool provides you free essay proofreading services. It proofread your papers without grammar, spelling, and punctuation mistakes. Essay checker Proofread your papers or essays using our advanced grammar check, spell check, and punctuation checker. It also covers all general mistakes such as writing style errors, misused words, typographical errors, spelling, and grammatical errors in just a few simple steps. 

Our professional grammar check software supports English, Spanish, French, Chinese, Japanese, Russian, Dutch, Italian, Tagalog, Swedish, Austrian, Belarusian, Breton, Catalan, Danish, Esperanto, Galician, German, Greek, Khmer, Persian, Polish, Portuguese, Romanian, Slovak, Slovenian, Tamil, Ukrainian, etc. You need to enter or copy-paste your text into the provided box, then click "Check Text." Our essay checker scans your text and highlights potential errors with different colors based on the type of error. Click on the error word to learn more about it and how to fix it. If you disagree with our recommendation, click Ignore.

Essay Proofreader  

Professional online editing and proofreading services proofread your research papers more precisely so that no standard grammar rule will be ignored. It suggests alternate grammar prediction words to fix spelling and grammar mistakes. We offer grammar check, spell check, and punctuation checker that makes your essay error-free. Online proofreader supports English grammar, Spanish grammar, French grammar, Chinese grammar, Japanese grammar, Russian grammar, and more than 20 other languages.

Our free automated proofreading software is programmed to proofread your research papers or blog posts precisely with in-depth analysis. We use advanced data processing algorithm technology to ensure that every grammar rule is taken to account while checking. We have a large vocabulary database that can help you fix your spelling and grammar mistakes by suggesting English words and phrases. Our grammar and spell check will detect writing style errors, misused words, spelling errors, and grammar mistakes that other simple sentence checker tools will not detect.

Frequently Asked Questions

What is proofreading.

According to the Cambridge dictionary, it is a process of detecting and correcting errors in your text before it is published. If you are a content writer or blogger, then you know content is king. If you want to survive, you need to write high-quality content. We developed our online essay proofreader to identify spelling, grammar, punctuation, and syntax errors in your essay. We suggest fixing those errors by providing grammar suggested words from our huge English word database.

Why is proofreading so important?

The final stage of editing before publication is known as proofreading. It is an essential part of an editorial cycle. Any publications center will go through the proofreading stage before they publish it. In this stage, you need to find and resolve grammar, spelling, punctuation, capitalization, typographical errors, and style guide formats errors.

What are the benefits of proofreading?

The Online professional proofreading and editing tool is a web-based application. It is highly secure with SSL encrypted connection. Once you paste your text into an online proofreading service, it will scan your text in real-time. We have a sophisticated error detection and correction algorithm that compares every word of your article and provides an error-free final version.

It is useful for teachers, students, bloggers, and content writers. It is one of the best ways to learn how to avoid making the same mistakes repeatedly. It improves your writing skills and provides error-free content. We optimize our applications for many browsers and devices. We have millions of happy customers all over the world.

How does the proofreading tool work?

Follow below easy steps to use the tool:

1.  Open Proofreading Tool

2. Write or Copy-paste your essay or research paper. Choose American English or Australian English or Canada etc country language that you want to check your text. We support checking English, Spanish, French, Russian, Chinese, Japanese, and more than 28 other languages. 

3. Click on “Check Text” then an online proofreader will scan your entire text and highlight your grammar and spelling mistakes with a different color.

4. Click on the highlighted word to get grammar suggested words to fix the error.

How to proofread professionally?

Our free proofreading online tool is easy to use and we requires no additional software installation. We build our essay checker with advanced sentence correction technology that suggests multiple suggestions to fix your errors. Our essay proofreader is trusted by teachers, students, writers, and bloggers all over the world. We make your content SEO-friendly, plagiarism-free.

If you are seriously facing spelling and grammar problems for your papers, you have taken the right decision by choosing our tool. Our automated proofreading tool error detection and correction mechanism will help to solve your grammar mistakes, spelling errors, and syntax errors.

What other tools grammica offer?

Grammica.com offers not only a grammar checking service and also offers Proofreading, Spinbot, Word counter, Paraphrasing tool, and a lot more text-related tools. These tools are useful for students, writers, bloggers, and teachers. We designed our tools professionally to give you accurate results, and we are trusted all over the world.

Instructions :

1. Enter or Paste your text into the box provided.

2. Select a country language that you wish to check.

3. Click "Check Text" to begin the proofreading process.

4. Proofreader identifies grammar and spelling mistakes in your essay.

5. The advanced error correction algorithm suggests multiple words to fix the error.

1. The advanced error correction algorithm suggests multiple words to fix the error

2. It has a unique approach to identify and rectify errors.

3. proofreader software is highly secure & optimized for high speed.

4. It is compatible with modern devices and browsers all over the world.

5. No additional software installation and registration required.

Save texts and enjoy a better writing experience

More than a Grammar Checker Free Grammar Checker

Languagetool is an ai-based grammar checker. paste your text or start typing below to check grammatical errors, and spelling mistakes across languages., 2000+ organizations trust our ai-based grammar checker.

• European Union
• Spiegel Magazine
• Deutsche Presse-Agentur (dpa)
• Algemeen Nederlands Persbureau (ANP)
• Max-Planck-Gesellschaft
• Bertelsmann Stiftung
• Schweizer Radio und Fernsehen (SRF)
• IP Australia

Try the LanguageTool Editor for a Better Writing Experience

Create your free account.

• Distraction-free writing experience
• Personal Dictionary
• Statistics help you stay on the write path
• Texts are securely stored
• Access even more suggestions for advanced punctuation, style, and typography with the “Picky Mode”
• Choose between dark and light appearance

Our Browser Add-On Works Anywhere on the Web

Receive tips on how to improve your text while typing an e-mail, a blog post, or just a simple tweet. Whatever language you’re using, LanguageTool will automatically detect it and provide suggestions. To respect your privacy, no text is stored by the browser add-on.

Over 1 million users trust LanguageTool with their writing

Top-rated grammar checker for Firefox with over 1 million users

Over 4 million users trust LanguageTool with their writing

Top-rated grammar checker for Chrome with over 3 million users

Do you speak a foreign language?

The most international writing tool.

There are over 7,000 languages and various multilingual countries in the world. LanguageTool helps as an international spell checker in several languages, including:

+ more than 30 other languages and dialects

Reach your potential with statistics.

This feature helps you stay consistent with your writing by tracking your productivity. It also provides an overview of languages used, errors made, and suggestions applied, so you can see for yourself how your writing skills have improved.

Elevate Your Writing With the Grammar, Spell, and Style Checker for Windows

Experience LanguageTool’s advanced spelling, style, and grammar suggestions right in all your favorite writing apps.

Supported Apps

Elevate Your Writing With the Grammar, Spell, and Style Checker for macOS

Integrates with your favorite office program.

Get the best out of your docs and deliver error-free results, whether you’re working on a dissertation, essay, book, or you just want to note something down.

Google Docs Add-on

Check all your texts in Google Docs for grammar and spelling mistakes with the free browser add-on.

macOS App for Microsoft Word

LanguageTool for macOS allows you to check text in Microsoft Word and most of your favorite Mac apps.

Microsoft Word Add-in

Works with Windows, Mac, and even the online version. Requires Word 2016 or later or Office 365.

Text checking for LibreOffice

• Use it in LibreOffice

Correct Spelling

Do you fall victim to typos and misspellings way too often? LanguageTool finds every mistake and underlines it in red. Spell every name, phrase, and word the write… eh, the right way!

Check Grammar

Grammar rules have never been so easy! LanguageTool will help rid your writing of all grammar gaffes, like incorrect subject-verb-agreement, wrong plural forms, or misuse of grammatical forms.

Fix Punctuation

Commas and dashes and hyphens… Proper punctuation can be tricky—LanguageTool ensures you’re using them right. It can even help you form complex sentences and tell you when you’ve used too many exclamation points!

Confirm Casing

It’s all about the capital, right? And the lowercase letters, too. LanguageTool corrects incorrect casing, whether you’re writing capitalized names, months, places, or national identities.

Improve Style

LanguageTool helps your writing be as stylish as you are by detecting overused phrases, foreign terms, redundant words, and improper word choice. All you have to do to find the best style is look out for the blue underline.

Paraphrasing Tool

Looking for the right words? LanguageTool's paraphraser makes them easier to find by using artificial intelligence to rephrase your sentences to be more formal, fluent, simple or concise.

Frequently Asked Questions

Make your text sound professional and avoid embarrassing style, punctuation, and grammar mistakes

LanguageTool corrects spelling mistakes , but it also offers a full writing analysis of all possible texts. In addition to spelling, grammar, and word choice, language style is also corrected. Plus, it serves as a punctuation checker to ensure your writing is flawless.

LanguageTool excels at identifying and correcting punctuation errors , including commas. Its punctuation checker can differentiate between optional and required commas, ensuring your writing is polished. Plus, it can handle even the most complex sentence structures with its advanced comma check.

The error display and suggestion cards are shown automatically and directly while typing. This means that texts can be checked and corrected in just a few moments. To see synonyms, simply double-click on any word.

LanguageTool masters more than 30 languages and dialects. Its main languages are English , Spanish , German , French , Dutch , and Portuguese . In its English version, you can choose between six standard varieties (US, UK, Canada, Australia, New Zealand, and South Africa).

LanguageTool is available in two versions. The free version corrects spelling as well as simple punctuation and some style mistakes. Only the Premium version will show you all errors and give you the best possible text. Team accounts for companies are also available.

LanguageTool is not bound to a specific program or website. There are several extensions and add-ons available, so it can be used in all common internet browsers. In addition, you can find a dedicated text editor as an app for iOS, macOS (Apple), and Windows. All you need is just one user account.

LanguageTool now offers an A.I.-based paraphraser in addition to correction. This can help you to rewrite entire sentences to make them simpler, shorter, or more formal.

If you have to write a term paper, bachelor thesis or master thesis at a university, LanguageTool can help you to be sure that it is free of errors. The writing assistant’s style check is also particularly helpful for other academic texts in schools or at publishing houses. By the way, students get a discount for LanguageTool.

Unleash the professional writer in you with LanguageTool Premium

Go well beyond grammar and spell checking, and impress with clear, precise and stylistically correct writing.

Purdue Online Writing Lab Purdue OWL® College of Liberal Arts

Finding Common Errors

Welcome to the Purdue OWL

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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.

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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