10+ Best Grammar and Plagiarism Checker Tools (Free & Paid)

10+ Best Grammar and Plagiarism Checker Tools (Free & Paid)

Last updated on September 21st, 2023

If you’re an entrepreneur, own a website, run a business, or are thinking of working with a pool of writers, you’d know the importance of grammatical correctness and originality of content.

Poorly written content with even minute grammatical or spelling mistakes can destroy the credibility of your brand. And if your content is found to be plagiarized from another source? Well, that can lead to not just a loss of reputation but even legal lawsuits.

The best grammar checker online tools can help you catch grammatical errors and refine your content to tailor it to a particular audience. Meanwhile, the best plagiarism checker can ensure that the work you publish online is authentic and original.

Well, here’s a curated list of effective plagiarism and grammar checkers handpicked by our experts!

While there are tons of tools to check grammar and free plagiarism checkers, what ultimately matters is the quality and effectiveness of the tool. We’ve included the best free grammar and online plagiarism checkers to help you pick the ideal option for your requirements and budget.

1. Grammarly

Grammarly is one the most popular grammar checker tools out there, used by 20+ million users. It’s widely accepted in the industry and used by writers and bloggers to check grammar, spelling, and punctuation and even improve the tone and style of their writing.

Grammarly has extensive third-party integrations and browser extensions and even uses AI-based algorithms to learn and suggest real-time updates.

G2 Rating: 4.6/5

Key Features

  • One of the most extensive and easy-to-use grammar and spelling checkers
  • Robust AI-based algorithm to make suggestions based on the context of your writing
  • Plagiarism checker available for the paid version
  • Extensive third-party integration and browser extensions


  • Free
  • Premium – Starts at $12 per month
  • Business – Starts at $15 per month

2. Hemingway Editor

Hemingway is more than a grammar checker tool—it’s also widely used to improve readability and writing style. Once the text is added to the editor, it provides instant feedback and recommendations and helps make the content more readable and impactful.

G2 Rating: 4.4/5

Key Features

  • Writing style and grammar checker
  • Third-party integrations and browser extensions
  • Mainly used to improve the overall readability of text and get grade ratings for your writing
  • Incorporates Automated Readability Index technology
  • Can be used online and offline


  • Online version – Free
  • Desktop version for Mac and Windows – $19.99 (Lifetime)

3. Pro Writing Aid

ProWritingAid is an online grammar-checking tool ideal for editing and fixing simple grammar errors like punctuation and spelling and making other grammatical edits.

The best thing about this tool is that it integrates with third-party document interfaces like Google Docs, Gmail, WordPress, Microsoft Office, and most web browsers, making it easy to use across platforms.

G2 Rating: 4.5/5

Top Features

  • Spelling and grammar checker
  • Improves your writing score by recommending readability checks, clarity suggestions, jargon reduction, etc.
  • Provides learning resources to help make you a better writer
  • Mac and Windows support
  • Third-party integration and browser extensions
  • Plagiarism check available
  • Extensive writing reports and scores


  • Free
  • Premium – Starting at $79 per year 
  • Teams – Starting at $96 per year 

4. WhiteSmoke

WhiteSmoke is a grammar checker and proofreading solution that corrects spelling, grammar errors, punctuation, and even style.

It also has a translator and dictionary of 50+ languages and 100+ built-in templates using NLP (Natural Language Processing) for text analysis and understanding patterns in your writing.

G2 Rating: 5/5

Key Features

  • AI-based NLP text analysis
  • Editing for correctness in sentences, punctuation, and spelling
  • Expert grammar correction
  • Plagiarism check available
  • Translation in 50+ languages and dictionary


  • Web – Starts at $5 per month
  • Premium – Starts at $6.66 per month
  • Business – Starts at $11.50 per month

5. Zoho Writer

Zoho Writer is a great online writing tool that packs amazing features. It uses machine learning to detect and suggest context-aware suggestions, subject-verb agreement, and punctuation errors.

The word processor is also perfect for documents and files and can do away with the need for a separate writing document.

G2 Rating: 4.4/5


  • AI-powered writing assistant
  • Checks for spelling, style, and readability and suggests updates
  • Includes the Flesch-Kincaid index and a polysyllabic words/run-on sentences detector


  • Free for individuals
  • Business plans come paid but are included in the Zoho WorkDrive

6. Copyscape

Copyscape is a cloud-based plagiarism checker that is most extensively used by platforms and bloggers to identify the originality of the content. This is one of the best free plagiarism checkers, as it allows you to perform unlimited scans for web copies and gives accurate results.

G2 Rating: 4.5/5


  • Allows search in batches
  • Compares content side by side
  • Provides scores and checks for duplication within your content
  • User-friendly and supports offline content indexing


  • Free
  • Premium plans start at $0.03 per search (200 words)

7. Unicheck

Unicheck is a plagiarism checker that provides a detailed report on your content by searching from web pages, institutional library files, and educational databases.

The report can be used to check for plagiarism and comes with extensions to be used with web browsers or apps (Google Docs/Microsoft Office).

G2 Rating: 3.4/5


  • Provides instant notification on finding suspicious content in a document or text
  • Provides privacy using encrypted text
  • Offers a personalized dashboard and comparison tool
  • Detects plagiarism and calculates scores in real time


  • Personal plan – Starts at $15 per month
  • Business plan – Starts at $15 per month
  • Tailored plans for K-12 and higher education institutions

8. PlagiarismCheck.org

PlagiarismCheck.org is a trusted plagiarism checker used by universities, teachers, students, and several other platforms to detect plagiarism and text manipulations. They have plans for individuals, businesses, as well as K-12 and educational institutions, with different features tailored for these customers.

G2 Rating: 5/5

Key Features

  • Advanced algorithms to detect plagiarism and text manipulations
  • Unlimited checks starting from the basic plan
  • Integrations with third-party tools and docs
  • Grammar and spelling checkers included
  • Citation generator to help cite proper sources


  • Individuals –
    • Basic plans starting at $5.99 per month
    • Premium plans starting at $45.49 per month

9. Duplichecker

Duplichecker is another fantastic free plagiarism checker available online that supports multiple file formats like .txt, .docx, .doc, .rft, and more.

G2 Rating: 4.6/5


  • Free plagiarism checker that allows plagiarism checks for a maximum of 1000 words at a time
  • Copy-paste directly into the search box or upload documents
  • Offers plagiarism comparison and rephrasing suggestions
  • Extremely user-friendly


  • Free
  • Premium starts at $25 per month

Suggested Reading : Top 10 Content Writing and Marketing Courses With Certifications

10. iThenticate

iThenticate is a plagiarism checker trusted by researchers, publishers, and scholars, as it compares input text with 10,000+ cited journals and 1500+ publishers worldwide.

G2 Rating: 5/5


  • Trusted plagiarism checker that compares submissions with 15000 publishers and 10000 cited journals
  • Ideal for checking plagiarism in educational or research documents, as it can be used for academic articles, books, conference papers, scientific, technical, and medical journals


  • Single User Plan starts at $100 per month
  • Multiple User Plan starts at $300 per month

11. Copyleaks

Copyleaks is a great plagiarism checker that allows users to check for plagiarism in more than 100 languages. The AI-based algorithm helps detect plagiarism, paraphrased content, and similar text by comparing with extensive databases on the internet.

G2 Rating: 5/5


  • Professional plagiarism checker with automated grading and comprehensive reports
  • Plagiarism checks in 100+ languages using AI-based anti-plagiarism software
  • Ability to compare two files and get recommendations


  • Free Plan – 10 pages per year
  • Premium starts at $9.16 per month, allowing checks for 1200 pages per year

How to Choose an Ideal Grammar and Plagiarism Checker Software?

When choosing the best plagiarism checker or the best grammar checker online, it’s important to check the various features and understand which is best suited for your requirements. Some of the key factors include:

The Ease of Usage

Online tools should be easy to work with and uncomplicate your life. So, select user-friendly tools that can be used on multiple platforms to help you check grammar and plagiarism quickly and without much hassle.

Free vs. Premium Features

While the best free online grammar checkers and free plagiarism checkers come with excellent features apt for the general audience, there are times when you may need advanced features that come at a price.

Paid tools often include advanced features, quality checks, and AI-based recommendations, which help improve the quality of the content and even facilitate comprehensive plagiarism checks across wider databases to make the results highly accurate and professional.

The Quality of the Results

When it comes to content that will be published online or on a platform, content quality is crucial. If the content is not as per business standards or lacks the flair required for the particular audience, the chances of ranking on Google are dismal. So, use a professional grammar checker and the best plagiarism checker that is widely accepted and recommended in the industry.


With these professional grammar-checking tools and online plagiarism checkers, proofreading and verifying the originality of content is a breeze.

Most of these tools come with free features, but there are paid options too, which are ideal, especially if you have a professional or business website/blog. While no one tool can meet all your requirements, you can look at the pros, cons, and features of each and choose the right one to help you level up your content game. 


  1. Who needs a grammar and plagiarism checker?
    Plagiarism and grammar checkers are used not just by universities and scientific research publications but also widely adopted by online publications, websites, blog owners, business owners, and writers to check their work before publishing.
  2. How can I check my grammar and the uniqueness of the content?
    There are several free and professional grammar-checking solutions available that can help identify basic spelling errors, punctuation mistakes, and grammatical issues. Most tools use AI and advanced algorithms to recommend updates based on the context of your content, making sure that it is checked thoroughly for grammar and uniqueness.
  3. Are all the grammar and plagiarism checker tools free?
    No. While there are free plagiarism and free grammar-checking websites, most premium tools are paid. Some have a freemium option for the basic features, while the advanced functionalities will be accessible only after a subscription.
  4. Which is the best grammar-checking tool?
    Although there is no clear answer to this question, Grammarly is undoubtedly one of the most widely accepted and popular tools. It can improve writing by checking for correctness of grammar, spelling, and punctuation, as well as enhance the clarity of your writing.
  5. How do tools to check grammar help professional writers?
    A professional grammar-checking tool doesn’t just spot the usual typos and grammatical errors; it also helps writers refine and rewrite their content based on the selected audience, industry, and tone.
  6. Is using a grammar and plagiarism checker safe?
    Yes, all the tools mentioned in this article are safe to use and follow strict user policy frameworks. Furthermore, since most are cloud-based, it ensures they do not share personal information or store it with a third party.
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