The 11 Best Plagiarism Checker tools in 2021

There are a lot of plagiarism checkers out there, many of which are completely free. Today, we will take a look at the 11 best plagiarism checkers available today.

Plagiarism Checker tools have been around since the days of Hotmail and WordPress. Google Docs, Dropbox, and other programs have been using plagiarism checker tools since the late 2000s—but in 2021, the tools have reached new heights and become safer, more affordable, and easier to use than ever before.

So, you’ve written your masterpiece. You’ve sat down with pen and paper and created a work of art. You’re proud of it. You post it to your blog and maybe even share it with friends. But then someone else posts the same exact thing, with a different title. This happens all the time, and it’s a problem. That’s where plagiarism checkers come in. They help you see when your work is stolen.

If you want to be taken seriously online, your material must be of excellent quality and devoid of plagiarism. Original material is also better for SEO, and copying someone else’s work will get you penalized by Google.

Contents Table of Contents:

Plagiarism Checker Software at Its Finest What is a Plagiarism Checker, and how does it work? What Are the Benefits of Using a Plagiarism Checker? The Advantages of Plagiarism Checkers FAQs about the Best Plagiarism Checker

There are many of plagiarism checking programs available to assist you. Not only can you verify your own work, but you can also look for any of your work that has been copied online. We analyzed and assessed the top choices to see which one is the finest plagiarism detector available.

  1. ProWritingAid
  2. Grammarly
  3. Copyscape
  4. Unicheck
  5. Duplichecker
  6. Whitesmoke
  7. SmallSEOTools
  8. Copyleaks
  10. Quetext
  11. Plagiarism Checklist

Continue reading for a more in-depth look at each tool.

1. ProWritingAid is a tool that helps you write better.

Plagiarism Checker for Artists and Screenwriters (Best Plagiarism Checker for Artists and Screenwriters)

Another big hitter aiming for world-class status is ProWritingAid. ProWritingAid is ideal for novelists, authors, and creative writers since it is one of the finest grammar and plagiarism checkers available. Manuscripts, literary works, and other full-length items are all checked using this instrument. It also checks for problems in punctuation, grammar, and style.

It operates directly within MS Word, making it very convenient to use. It also has Google Docs and Scrivener integration for quick access. ProWritingAid is available for Windows and Mac, as well as Chrome and Apple browsers. However, at $10 per month for ten scans, ProWritingAid is a little expensive.


  • It works in Microsoft Word.
  • All browsers are supported.
  • Full-length manuals, manuscripts, and even novels are screened.
  • Scrivener and Google Docs have useful connections.

⛔️  CONS:

  • It’s a little pricey at $10 for ten scans each month.

Grammarly is number two.

Overall, the Best Plagiarism Checker

Grammarly takes first place in the plagiarism checking competition. The software checks for correct language, punctuation, tone, and plagiarism using advanced algorithms. Grammarly also evaluates for readability and recommends vocabulary improvements as well as genre-specific writing style advice. For the Premium service, there are three price options (monthly, quarterly, and annually).

grammarly screenshot

Grammarly is available as a web app or as a mobile app for your phone, tablet, or other device. Grammarly also has plug-ins for major browsers and email programs, so your material is constantly checked whether you’re texting, emailing, writing a contract, or putting together a Word document. Grammarly has your back at all times!

You may check plagiarism for free by pasting the text into Grammarly’s plagiarism checker tool and seeing the results. Grammarly has partnered with ProQuest to use their academic resources as a backbone for its plagiarism detection program.

The plagiarism checker on Grammarly is by far the most accurate. For accuracy, writing experts and publishers swear on Grammarly’s plagiarism detector. Although you can scan text for free, you’ll need to upgrade to a premium subscription if you want to see the complete findings and use all of the fancy features. Grammarly has three tiers from which to select.


  • There are three different price options available.
  • Works in any browser or as an app on the web.
  • It’s simple to use.
  • Checks for plagiarism and is useful for academics (it utilizes ProQuest’s academic databases).
  • Plagiarism checker with the highest accuracy.

⛔️  CONS:

  • To get all of the features, you must subscribe to a premium subscription.

3. Using Copyscape

Best for Plagiarism Checking in Bulk

Copyscape is another online plagiarism detector that you may use for free. You may input a URL and have it compare that page’s content to the rest of the internet. If that’s all you need, the free version is great, but the Premium version gives you a lot more bang for your money.

copyscape screenshot

Bulk checking, plagiarism case management, the ability to copy/paste text to assess, testing your whole website at once (up to 10,000 pages), and additional features like an API to verify material on your site automatically are all included in Copyscape.

They charge 3 cents each search (up to 200 words) and then 1 cent for every 100 words beyond that. Copyscape is a good alternative to Grammarly, but it may become expensive if you need to check a lot of material.


  • Side-by-side comparison tools are built-in.
  • It’s very simple to use.
  • It’s quite good at identifying plagiarism.

⛔️  CONS:

  • It’s not cheap to use; the more words you have, the more money you’ll spend.
  • Incorrect highlighting of correctly referenced sources on occasion.

Unicheck is number four.

Unicheck is a great alternative to Copyscape and other plagiarism checkers for authors who want to be sure their work is unique. More than 1,100 schools claim to utilize the tool, which is ideal for academics.

On their website, there are an amazing amount of college and school logos scrolling. The feedback from users is a mixed bag. The majority of users give the program a 4.5-star rating, praising its accuracy, simplicity of use, and large database.

unicheck screenshot

Unicheck, unlike other programs, has a one goal: to identify and correct plagiarism, which it does well. Although academics are their main target market, they also provide a commercial tool. Even for those on a tight budget, the prices are reasonable.


  • Even low-income kids can afford it.
  • It’s ideal for scholarly work.
  • Accurate.
  • It’s simple to use.
  • Your papers (privacy) are not saved in their database.

⛔️  CONS:

  • The free edition only allows you to create one page.
  • There are no advanced editing options available.

Duplichecker is number five.

Plagiarism Checker for Free

Duplichecker is another strong competitor, especially for instructors, students, and aspiring young authors. You don’t have to pay anything to utilize it since it’s totally free. To use Duplichecker, just copy and paste your text into the box and press the button to start the procedure.

duplichecker screenshot

A plagiarism checker, a word counter, a spell checker, and a grammar checker are just a few of the features available with Duplichecker. The UI is a bit dated, but the system functions effectively and is, once again, completely free to use. The sole restriction is that you are only allowed to check 1000 words at a time.


  • It is entirely free to use.
  • Students, instructors, and young writers will like this book.
  • It’s very simple to use.

⛔️  CONS:

  • The user interface is outdated.
  • At any one moment, you are limited to 1000 words.

6. Plagiarism Checker by Whitesmoke

Excellent for both teachers and students.

Another great tool for both students and instructors is Whitesmoke. It compares content samples to billions of websites to determine whether they’ve been reused, duplicated, or stolen. It isn’t as well-known as Grammarly, but it is efficient and effective, and the Word and Outlook interfaces make it convenient to use on the go.

whitesmoke screenshot

Whitesmoke is a full-featured software that includes grammar and punctuation checks. They claim to be able to “detect more mistakes than any other technology on the market.” Whitesmoke is a Windows-based program that may be used with any Microsoft-compatible program. It also converts text into 50 other languages.


  • Integrations with Microsoft Word and Outlook.
  • Plagiarism detection that works.
  • A built-in translation tool is included.
  • All web browsers are supported.

⛔️  CONS:

  • There are no Mac applications available.
  • It’s very pricey.

SmallSEOTools is number seven on the list.

SmallSEOTools is another excellent tool for detecting plagiarism in your content. It’s not as strong or useful as Grammarly, but it’s free and contains a grammar checker, word counter, spell checker, paraphrase tool, and language translator.

They also offer a slew of SEO tools to assist with keyword density and density while producing content aimed at increasing website traffic.

smallseotools screenshot

SmallSEOTools also contains comprehensive backlink tools, metadata resources, website monitoring, proxy, and domain administration tools, as well as backlink tools to evaluate your website for SEO-friendliness. That’s only the beginning; this free service has hundreds of additional features to help you improve your website and make it simpler to discover on the internet.


  • It is entirely free to use.
  • Hundreds of SEO, word counting, grammar, and other add-on tools are available.

⛔️  CONS:

  • Website has a lot of ads.
  • The interface is not very user-friendly.
  • Other plagiarism checkers are more effective.

Copyleaks (nine)

Copyscape’s biggest adversary is Copyleaks, but everyone has competitors. Copyleaks not only searches the internet for duplicates of your material, but it also protects your copyright. Even if your work is free of plagiarism, your original text may appear elsewhere on the internet because it was stolen without your consent.

copyleaks screenshot

One of Copyleaks’ features is that it detects these infractions and alerts you to them so you may fix them. Teachers will benefit from the software since it enables them to examine 100 pages/essays at once. They offer a mobile app and a language translator, but unless you pay for the premium edition, you are restricted to just 2500 words each month.


  • At a time, check 100 pages (great for teachers).
  • There is a mobile app provided.
  • There are built-in translations.
  • Copy-protection software

⛔️  CONS:

  • The free edition has a monthly word restriction of 2500 words.
  • You are limited to 100 pages per month on the paid business plan. is a website that checks for plagiarism., an award-winning plagiarism program created by computer scientists, academics, and professional writers, is popular among instructors, students, researchers, and professional writers.

They provide a free and premium version, as well as various languages and are supported by Verisign, the BBB, and Truste. They prioritize security and protect customer data with SSL encryption, firewalls, and offsite backups.

checkforplagiarism screenshot

Customers may choose from a variety of price options at CheckForPlagiarism. Students, for example, would pay just $20, instructors will pay $85, and professionals will spend $95 and above. This company takes plagiarism extremely seriously, so if you’re looking for a tried-and-true service that respects academic standards and protects your material with top-notch security, this is the solution for you.


  • There are both free and paid versions.
  • Verisign, the Better Business Bureau, and Truste have all given their seal of approval.
  • Excellent security and backups are built-in from the start.
  • Students and companies have several price options.

⛔️  CONS:

  • Educators and business professionals will find it too expensive.

10. Inquiry text

Quetext is a decent alternative to Google’s plagiarism detector, but it isn’t the finest. It’s easy to use and comes with a free trial. The free trial, however, is limited to 500 words.

Quetext compares documents to internet sources and books, but not academic papers, thus it’s lacking a key component. As a result, instructors and students will find it less helpful.

quetext screenshot

It may function well for other purposes, but without a large database against which to compare text, it may miss things that other plagiarism checks do not. Quetext may be a good fit for you if your requirements are basic.


  • A built-in citation function will assist you in properly citing sources.
  • For a limited time, you may get a free trial to see how it works.
  • Plagiarism checker that is rather helpful.

⛔️  CONS:

  • The free trial is just 500 words long.
  • To use, you must have a monthly membership.
  • Plagiarism will not be checked against scholarly publications and sources.
  • Some users have expressed their dissatisfaction with false-positive findings.

11. Plagiarism Detection

Plagiarism Hunt is a free online plagiarism detector that acts as an all-in-one tool, filtering text through several of the major plagiarism checkers on Google, including Turnitin, Unicheck, Plagscan, and RepostSEO. You may either copy/paste text or upload a file into Plagiarism Hunt.

plagiarismhunt screenshot

Your work will be checked for plagiarism for free using one of the many internet tools available. For $6, you can view a full report. You may spend $45 to have anything checked against four of the most popular plagiarism detectors. The terms are clear, and the site is easy to navigate.


  • See how much of your work is plagiarized right now.
  • One of the checkers is free to use.
  • A comprehensive report is available at a low fee.
  • It’s compatible with Windows, Mac, and mobile devices.
  • Files may be sent in a variety of formats (doc/docx/pdf/txt).
  • Security – your files are not saved on their server.

⛔️  CONS:

  • When using the free version, you can’t select which checker to use.
  • Payment is required for comprehensive reports.
  • The website is badly written, with hundreds of grammatical errors, giving it a shaky legitimacy.

What is a Plagiarism Checker, and how does it work?

A plagiarism checker is software that compares a sample of text to hundreds of internet sources, books, academic publications, and scholarly papers in search of language that has been re-used or stolen without permission. Even subtleties that suggest stolen material may be detected by good plagiarism checkers. Most require a fee, although some plagiarism checkers are free to use.

What Are the Benefits of Using a Plagiarism Checker?

The majority of individuals utilize a plagiarism checker to ensure that no portion of their work has been copied. They are sometimes used by academics to verify that students properly cite sources and quotations.

The Advantages of Plagiarism Checkers

Using a plagiarism checker has many advantages. The following are the most frequent reasons for using a plagiarism checker:

  • Assuring the originality and distinctiveness of material supplied by others.
  • Making sure you aren’t plagiarizing anybody else’s work by checking your own writing.
  • Searching for paraphrasing and repurposing material without properly crediting sources.
  • Make use of the other features, such as grammar, spelling, use, wordiness, style, and punctuation correction.

FAQs about the Best Plagiarism Checker

In basic terms, what is plagiarism?

To “plagiarize,” according to the Merriam-Webster online definition, is to “take and pass off (another’s ideas or words) as one’s own.” To utilize (another’s work) without giving credit to the creator. To plagiarize works of literature. Plagiarism is, at its most basic level, a kind of deception, with severe repercussions.

What are the four different kinds of plagiarized material?

Direct, self, mosaic, and unintentional plagiarism are the four kinds of plagiarism. Direct indicates that the author was aware that they were plagiarizing. Self-plagiarism occurs when you reuse your own work that has previously been submitted. Mosaic is when someone takes bits and pieces from a variety of various publications and assembles them to create something new. Someone forgets to properly cite a reference or give credit to the original author by accident.

What plagiarism-checking program may I use?

There are a plethora of tools available, and the information may be overwhelming. Check out our list of the top plagiarism checkers to help you narrow down your options and discover the best plagiarism checker for you.

What is the best plagiarism checker?

ProWritingAid is regarded as the finest online plagiarism detector by the majority of customers. Grammarly is a close second, with Copyscape and Duplichecker following closely behind. Some are free or provide free trials, while others need paid memberships.

Is there a plagiarism checker that is free?

Although there are a few free plagiarism checkers available, most of them include restrictions such as word limits or how frequently you can use them. The premium versions are usually considerably more comprehensive and useful. There is almost certainly a subscription plan that will meet your needs, depending on what you need.

Which free plagiarism checker is the best?

What is the best free plagiarism checker? It depends on your needs and how you plan to utilize it. Although Grammarly is the market leader, you can also obtain excellent results using ProWritingAid and other programs like Copyscape and Duplichecker.

Is the plagiarism detector accurate?

Most of the best plagiarism checkers are trustworthy, however the degree of accuracy may vary depending on which one you choose. Some are better than others, so read reviews and compare statistics before committing to a plan.

What is a satisfactory plagiarism score?

Typically, you’d aim for a 0% score, which indicates that the whole work is original and free of plagiarism. In terms of acceptability, however, most editors and scholars consider anything less than 15% to be acceptable.


Depending on your requirements, one or a combination of the tools listed above should be sufficient to ensure that your work is free of errors and plagiarism. Most will assist you in correcting any errors and improving your vocabulary so that you sound your best regardless of what you’re writing.

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Frequently Asked Questions

Which is the best plagiarism checker tool?

There are many plagiarism checker tools available, but the best one would be

What is the most accurate plagiarism checker free?

The most accurate plagiarism checker free is

Which is better Grammarly or Quetext?

Quetext is a free online grammar checker and spelling tool. Grammarly is a paid online grammar checker and spell-checker.

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