Sentence diagram

Grammar Check

Use this online grammar check to improve your grammar.

Grammar Checker - Linguisoft
   Current Writing Style: Casual

Grammar Writing Rules: Casual Writing Style Rules--(linked to Linguisoft's proprietary Grammar engine: Check your English text for all types of mistakes: grammar, spelling, punctuation, style, and more. References: The Chicago Manual of Style, 17th Edition, APA Style, MLA Style, The Elements of Style, William Strunk--Note: Recheck your corrections. New: Expanded text length: 4500

This tool is powered by the API provided by: Google NLP API is not used.

Grammar check

Spelling errors are highlighted and underlined in red, grammar errors in dark-green, grammar style check errors in light green, and punctuation check errors in purple.

Red - Indicates a spelling error.
Green - Indicates a grammar error.
Green - Indicates a style error.
Purple - Indicates a punctuation error.

Online Grammar Check Correction Click on the underlined error to see the suggested correction and error explanation. Click on the suggested correction to replace the error.

Click “Ignore error for this word” to Ignore the error or click “Ignore this type of error” for other mistakes. We recommend that you review the results after making corrections. Often, corrections create new sentence structure combinations, and the text should be rechecked for the best legibility.

Free yourself from embarrassing mistakes.

What is a grammar checker?

Grammar checking software scans your writing and then highlights and offers suggestions to correct grammar, style, spelling, and punctuation errors.

Why do we need grammar checker software?

Naturally, grammar, style, and spelling mistakes are inevitable because even the best writer still can slip up. Often, proofreading your own writing is awkward, and a "second set of eyes" can prove to be extremely helpful. Good grammar software locates mistakes that you may not normally catch. Rewrite the text with the suggestions offered.

How does the grammar checker know whether my writing is incorrect?

The grammar checking software uses stored parsing algorithms for every word and how the word can be used in good sense to parse your writing. This information is used to determine word order and phrasing in order to evaluate how it fits with standard grammatical textbook and stylebook rules.

A human editor is still the best.

Humans still beat computers with good writing sense. However, not many of us have access to a professional human copy editor. Using good grammar and spelling check software is the next best thing to improve your writing. It's somewhat like “having your English teacher looking over your shoulder while you write.”

Next, we'll explain some grammatical qualities of a good grammar checker.

Advantages of a good grammar checker: Structural Clean Writing.

Grammar Rules

Grammar Rules

Essentially, grammar is a system of rules that constitute a language and the logic of choice and order of our words. Proper grammar makes the relation between the words become clear, and we can communicate better without creating confusion. Knowledge of these grammar rules will help you to communicate better.

Good grammar checking software scans underlying deep sentence structure that results in clean concise writing.


A sentence is made of clauses, and a clause is a group of words that has both a subject and a predicate. Every complete sentence is made up of at least a clause. Clausal Diagram

The two clause categories are Independent and Dependent Clauses. And basically, seven types of clauses create sentences. A good clausal checker tool analyzes these seven sentence clause types: Independent/Main Clause, Subordinate Clause, Coordinate Clause, Relative Clause, Noun Clause, Adjective Clause, and Adverb Clause (includes implied Elliptical Clauses).

Transformational Clausal Structure

A good grammar checker checks underlying Transformational clausal structure and Thematic deep sentence structure correlation.

Try a simple sentence check such as this in any grammar checker: The problems you can encounter in a single sentence is often complex.
A deep sentence scan will indicate the verb error after an implied relative 'that' clause.

Sentence Structure

Sentence structure is the grammatical arrangement of a sentence and consists of four types: Simple, Compound, Complex, and Compound-Complex. Sentence Structure Diagram

A good sentence checker tool knows and analyzes sentence structure rules such as (1) a complete sentence must include a subject and a predicate, (2) a compound subject includes two or more subjects, (3) an independent clause consists of a subject and a predicate, etc.

A good sentence checker tool is programmed to know these grammatical rules (and also the many exceptions to these rules).

Learn More:

Which grammar checker is the best? How do the current crop of checkers compare, and how well do they actually work? An honest comparison study can show the structure checking depth of the current crop of checkers: Take a look at the study. Grammar Checkers: Comparison Tests.

Write Precisely. Try a Phrase Usage Style Check.

1. Choose simple words.

Avoid bookish and overly formal words and phrases. Write 'use' instead of 'utilize', 'near' instead of 'close proximity', 'help' instead of 'facilitate', 'for' instead of 'in the amount of', 'start' instead of 'commence'.

2. Avoid Wordy Expressions. Don't ramble with wordiness.

Students use three or more words when one word is good enough. Why?

Use specific words for a longer phrase. Do not use more words than necessary to express a thought. Good concise writing uses only the words you need to express an idea. No extra litter. Great writing doesn't need fancy words.

Use 'while' instead of 'during the time that', 'because' instead of 'because of the fact that', 'now' instead of 'at the present time', and 'if' instead of 'in the event that'. A simple term conveys the same idea and is easier to read and remember.

A good phrase usage style check eliminates these types of writing style errors.

3. Redundancy Reduces Conciseness.

Redundant phrases repeat or express the same thought again.

Some common examples of redundant phrases:

  • free gift
  • circle around
  • close proximity
  • small in size
  • the reason why
  • true facts
  • basic fundamentals
  • past history
  • collaborated together
  • consensus of opinion
  • in spite of the fact that

A good phrase usage style check eliminates redundant phrases.

4. Write short sentences.

Keep sentences short for the same reason that you keep paragraphs short: they’re easier to read and understand.

Use a Readability Check to determine reading ease. Use a Readability Statistics Analysis to zoom in and tailor each sentence to target your specific audience.

Catch embarrassing punctuation errors

What are the 14 English Punctuation Marks?

The 14 punctuation marks that are used in the English language:

  • Period, question mark, exclamation point
  • Comma, colon, and semicolon
  • Dash and hyphen
  • Brackets, braces, and parentheses
  • Apostrophe, quotation marks, and ellipsis

Some common punctuation errors:

  • 1. Missing an apostrophe:
    Wrong: The mans dog barked.
  • 2. The Comma Splice:
    Wrong: He was there, she was here.
  • 3. Multiple Punctuation Marks:
    Wrong: This is amazing!!!!
  • 4. Incorrect hyphenation:
    Wrong: It was pre-eminent.
  • 5. Commas in a series:
    Wrong: We have dogs, cats and a hamster.
  • 6. Missing comma with dates:
    Wrong: It was April 1 1989 when the accident happened.

A good punctuation check will check for these types of errors.

Catch more errors

Grammar Context

college students

A good proofreader identifies more grammatical errors with better accuracy.

Some examples of spell-checking errors in context: Checking homophones in context, checking multiple words and phrases such as "Ne wYork", and contextual word compounding such as "air port, can not, setup, set up, make up, makeup, back up, backup, workout, work out", etc. Many compound words have different verb, noun, and adjective forms.

Some examples of grammar errors in context: Checking for double negatives, double references, dangling modifiers, unclear pronoun reference, verb tense shift, improper parallelism, etc.

Error corrections include explanations that help to improve writing skills.

Deep-syntactic Dependency

Deep-syntactic dependency structures

Most grammar tools claim to be accurate yet rarely catch common contextual spelling and grammar mistakes. Only grammar checking tools that assign Deep-syntactic dependency structures to a sentence can potentially catch in-depth contextual errors.

Use the truly best grammar checker

Overlooked grammatical mistakes can diminish writing quality. Improve it, and write error-free content.

We wrote our own core grammar engine that uses proprietary research for the correcting of spelling, grammar, punctuation, style, and misused word mistakes.

Our writing rule sources include The Chicago Manual of Style, 17th Edition, APA Style, Manual - Modern Language Association, The Elements of Style, William Strunk, AP Style - Associated Press, APA - American Psychological Association, and many more.

These rank as the professional standard guides of style, usage, and grammar for writers.

Strunk and White - Elements of Style We extensively use "The Elements of Style" as our prominent style reference and recommend it as a manual desk reference. "The Elements of Style" was listed as one of the 100 best and most influential books written in English since 1923 by Time. Many contemporary authors still recommend it highly. Their praise tends to focus on its characterization of good writing and how to achieve it, grammar being just one element of that purpose. [The Elements of Style-Wikipedia]

A powerful free English grammar checker

A good professional grammar checker tool helps you to significantly improve your writing quality.

We created a base of over 300 English writing rules with time-proven algorithms to correct common grammar and spelling mistakes, including verbs, nouns, pronouns, prepositions, homophones, punctuation, phrases, dependent and independent clauses, and more.

This research created a configurable tool base for school students, academia, professionals, and writers who need extra help with grammar, punctuation, and style.

Francisco_de_Goya Our target writing styles include Literary and creative, Performative, Interpretive and academic, and Researcher/Scholar.

Our target writers include Novelist, Satirist, Short story writer, Playwright, Screenwriter, Speechwriter, Biographer, Critic, Editor, Essayist, Historian, Blogger, Columnist, Journalist, Memoirist, Letter writer, Technical writer, and Report writer.

Use our free online grammar check to help you write better

Our online grammar checker has much more grammar, style, spelling, and punctuation checking power. Grammar Checkers: Comparisons Testing study compares the current group of grammar checking proofreaders.

Submit your writing only after revising and proofreading with Grammarian Online. Rely on a reliable professional to improve your writing.

Check your way to success

Successful writing is extremely easy and accurate with our professional grammar proofreader software. The Linguisoft Grammar Checker helps you to write better and revise more efficiently. You’ll never need to ask for help with English grammar rules again. Learn from your own mistakes as you correct your text and avoid repeating the mistakes in the future. Learning to write better is remarkably easy. Start improving your writing by making your writing better. Try the checker for checking papers and essays.

Clean Writing™

Clean Writing™ without grammar, spelling, and punctuation mistakes is essential with concise writing. Clean writing can make the difference between a good grade and a perfect grade. Comprehensive communication skills and effective error-free writing are necessary to reach a target audience. Revising with our grammar check cleanses your writing. Use your best writing skills to connect with your target audience.

Time Proven

Our time-proven conceptual design has deep fine-tuned parse algorithms that find deep sentence structure and clausal errors that most grammar proofreaders cannot find.

Fast, easy, and reliable. Write better and improve your writing skills. Check your grammar online free.

Yes. It's the World's First Grammar Checker.

A good grammar checking tool scans underlying deep sentence structure that results in clean concise writing. We have the knowledge and expertise. We created the first contextual grammar checker software Sensible Grammar, Sensible Software over four decades ago. (The image zooms for closeup.)


We also have a Premium PRO Version.

Write Better. Go Pro3. Our premium pro version catches many MORE errors.

Looking for more? With premium, you’ll have everything that comes with the free online check, plus so much more advanced checking, full integration, and many other features. Avoid manual copy/paste and keep the formatting of your original text. Correct your text in Twitter, Facebook, Mail, Gmail, forums, blogs, etc.

Use it for book writing, copywriting, business communication, freelance writing, blogging, school homework, class assignments, doctorate thesis, PhD dissertation, etc. Use our premium app as a seamless extension of Pages, Microsoft Word, Scrivener, Safari, Firefox, Outlook, PowerPoint, OpenOffice, or any app. Fine-tune your writing skills with the best professional grammar check proofreader solution.

Besides using our own research, we also use Apple's NLP Natural Language framework to supplement our own algorithms to determine semantic distance and to train and deploy natural language models. Anyone dedicated to writing should definitely consider our full-featured premium vers=ion. Although a desktop version of the software is available for purchase, it’s also completely free to try here.

Our premium grammar checking software app scans readability and human interest; it tags the above text as:

* Readable grade level: 8th grade
* Reading Age: 13 years old
* Readable by: 56% of Adults
* Human Interest: Highly Interesting

Grammar check markup/similar words 11 Most Common Grammar Mistakes to Check For In Your Writing

And our checking software catches them for you:

1) They’re vs Their vs There

Their less likely to cause trouble. They're less likely to cause trouble.

Their is a new house down the street. There is a new house down the street.

2) Its vs It’s

Its a good day today. → It's a good day today.

3) Then vs Than

It was larger then the requirement stated. It was larger than the requirement stated.

4) Dangling Modifiers

Having walked on the bridge, a wallet was found. While having walked on the bridge, we found a wallet.

5) Lose vs Loose

I will not loose my wallet. I will not lose my wallet.

6) Farther vs Further

The student read farther in the textbook. The student read further in the textbook.

7) Subject Verb Agreement

A small percentage of the people wants a job. → A small percentage of the people want a job.

Twenty dollars are due. Twenty dollars is due.

8) Use of Commas

We have dogs, cats and a hamster. We have dogs, cats, and a hamster.

9) Who vs That

The lady that just joined went with us today. The lady who just joined went with us today.

10) Less vs Fewer

Less people attended than before. Fewer people attended than before.

11) Between vs Among

The money was divided between the four players. The money was divided among the four players.

This grammar checking tool finds and corrects hundreds of thousands of complex writing errors — so that you don’t have to! Connect with your audience through more concise content. Use the best writing solution, and write successfully with a professional grammar checker tool. Language is supposed to be fun. Have fun with it.

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