20 Best Online Plagiarism Checker Tools

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plagiarism checker

One of the most common problems teachers encounter is a high amount of plagiarized papers submitted by their students.

Luckily for them, there are a lot of free plagiarism software out there that will help users check their content.

You might be surprised but people very often search for plagiarism detection software for Google search engine optimization.

These plagiarism checkers are usually paid but there are some free and freemium ones that are also useful.

Let’s see some of the best plagiarism checker tools on the internet, their features and how they work.

  1. Turnitin

Turnitin plagiarism checker is among top of its class and is mainly used for teachers and professors.

In terms of complexity, it is among the best-rounded with options such as:

  • Add a comment(allow professor to add a note to the document)
  • Original insights(shows the blog on which student found data)
  • Feedback(feedback for section of text)
  • Engage students(gives professor chance to grade work).

After you check for plagiarism, you are able to upload a report with all the details that will help student improve its writing.

  1. Grammarly

Grammarly is a bit different as it isn’t mainly focused on plagiarism.

This tool allows you to find all the mistakes you have in your text. It works rather easily and you can get reports from the website in no time.

Grammarly makes it even better that the tool has extension that can be downloaded and used in Google Chrome.

After you copy paste the article, Grammarly plagiarism detection tool will return a list with underlined issues.

There are also explanations leading you through the process.

Of course, I wouldn’t be talking about this tool if it didn’t have plagiarism feature. It is a rather rudimentary option but it works well in combination with its grammar checker.

  1. Quetext

Quetext tool is a relatively new tool revolving around Deep Search Technology.

This is one of the most advanced systems I have seen and it is definitely something that seasoned professionals should at least consider.

Although Quetext has a free version, you have to have in mind that this is mostly a trial option.

You will get all the features if you sign in and create a paid account.

It allows you to upload several files at the same time, there is no limit to the number of documents you can check.

Quetext can support texts up to 25.000 words long, you can get files in PDF format and it can exclude sources you don’t wish to be checked.

  1. Duplichecker

Duplichecker is one of the best examples of free content checkers.

Like some similar, basic plagiarism checkers it works by inserting copy pasted text into an empty box.

After that, the online tool will do its search through the Internet and find all the sources that have something in common with your text.

Of course, it is a bit limiting with only 1.000 words you can put in. It also gives just the basic data without advanced information regarding your article.

  1. Plagtracker

Plagtracker tool comes in two versions: free and paid.

If you choose to use free, you have limit of 3 plagiarism checks over a month.

But that isn’t the main reason why you should give this plagiarism software a chance.

First of all, Plagtracker paid version is really awesome.

After doing initial check, it will present you with a percentage of plagiarism and also, precise sentences that were copied will be shown.

On top of that, you will also get a list of sources where these plagiarized sentences were found.

If that wasn’t enough, there is a live support for all those who paid for Plagtracker monthly subscription.

  1. Plagiarisma

Most of the tools on this list are used straight from the web – you enter a text and you get results.

Plagiarisma’s uniqueness is the fact that you can also download the software.

This is a great option for all those who do not have Internet available at all times but still need to do their routine plagiarism check.

Besides that, there aren’t many differences when it comes to Plagiarisma and other duplicate checker tools.

  1. Copyscape

When it comes to the most popular checker for plagiarism, Copyscape takes the top spot.

Besides the fact that it’s very precise, it has an amazing comparison feature which allows you to easily compare two pieces of content by copying them directly in the tool or by simply placing their URLs into Copyscape.

Aside from this, this service can help you with the following things:

  • Check your entire site with a click of a button (up to 10 000 pages at once)
  • Analyse your own content and search for duplicate issues within it
  • Ignore results from particular siteswhich you own or don’t want to be taken into consideration
  1. Plagiarism Checker by Small SEO Tools

Small SEO Tools company has numerous resources that should help user with various tasks. This free plagiarism checker is one of them.

Rather easy to use, this software is often overlooked when it comes to checking whether a text is unique or not.

Like all other programs, you need to paste or write a text into an empty box. You can also upload a document from Google Drive, Dropbox or your own computer. Tool supports .docx and .txt file format.

You can start the process with a simple click of a button; tool will provide results before long.

Even though this plagiarism detector is free and straightforward, provided results are not ideal. You require additional browsing to access plagiarized sources which can be troublesome.

Still, Plagiarism Checker by Small SEO Tools is pretty solid if you require a quick answer.

  1. SafeAssign

A lot of these tools are focused on academic writers and essay papers.

SafeAssign is the best example.

Part of Blackboard platform, this software can check an academic paper for uniqueness.

It uses several databases to do so including:

  • Internet
  • ProQuest ABI/Inform database
  • Institutional document archives
  • Global Reference Database

Due to a high number of total documents being used, it is impossible to avoid being detected.

While the plagiarism checker is great, the tool as a whole is much more impressive. It provides a complete solution for professors who wish to see if an essay is unique or not.

  1. Viper Plagiarism

Viper Plagiarism is based on three main features:

  • Check
  • Scan
  • Compare

Once you login, you can access the Viper Plagiarism dashboard. You are able to upload several files at the same time.

Users can also choose a particular field for checking. This will provide more focused and quicker results. There are also some other features such as checking the word count.

When the process is done, you will get a report with all the sources where plagiarism was detected as well as percentage of plagiarism.

  1. PlagScan

PlagScan is a program that works well both for teachers and business owners.

Unlike some other tools on this list that give you basic data about a written document, PlagScan creates a thorough report.

Besides percentage of uniqueness, you will get a bar which shows you where plagiarism was detected within a document.

This doesn’t seem really important for short documents. However, if you have a longer piece, it is a great way to skip to sections where plagiarism was detected.

Like with other tools, you will be able to see reference sources.

PlagScan uses three different colors to point out:

  • exact match sections
  • possibly altered text
  • quotations.

This is especially great for teachers as it shows them what was purposely copied, what was rewritten and what was used as a quote.

The tool allows teachers to leave comments which can help students learn based on their mistakes.

  1. Paper Rater

Similar to Grammarly, Paper Rater is a tool that doesn’t only help you with uniqueness but can also improve your grammar.

It has numerous great features such as plagiarism detection, grammar and spelling checker, writing instructions, vocabulary builder and so on.

When you submit a paper, it will not only compare it with other sources but it will help make it better.

There is no need to download it and it is easily accessible.

Paper Rater is one of those tools that are tailor-made for professors as it allows them to leave a feedback for students.

  1. WriteCheck

Currently WriteCheck is still in its development phase. However, based on reviews, it is definitely one of the more complex and thorough tools on the market.

The software has numerous options that should help during tutoring process. Its grammar feature is especially interesting pointing out spelling and grammar mistakes while helping with mechanics, usage and style.

There is no subscription as people are paying based on usage rate.

WriteCheck has several options making it great for longer essay papers.

  1. Plagium

In terms of a plagiarism checker that is free and has numerous options, there isn’t anything better than Plagium.

Free programs are similar when it comes to use: you simply copy paste or upload a file, click on a button and tool retrieves results.

Plagium is unique as it provides numerous filters which you can use.

You can detect plagiarism within a file, text or URL. There are also options to perform quick search, deep search and file comparison. On top of that, you can also add some advanced filters helping you segregate sources based on relevancy.

  1. iThenticate

Most of the tools that I mentioned today are focused on teachers and students. Of course, all of them can be used by companies but they are the secondary focus.

iThenticate is different in that regard as its main focus is on blogs, government and non-profit organizations and legal firms.

It uses a database with more than 100,000 publications. It also uses numerous web sources for reference.

Created by the same people who made Turnitin, iThenticate provides a unique dual view allowing you to instantly compare your file with a source in which plagiarism was detected.

Additionally, this software allows you to store all your files and put them in folders for later use.

  1. NoPlag

NoPlag has a free version with certain limitations. Thing that was most interesting to me is that a user is placed within a queue having to wait from 1 to 10 minutes.

Free version also has a limit when it comes to total number of words you can check: it doesn’t go beyond 500. This makes it almost impossible to use properly.

Paid version is much better and provides similar options like other plagiarism checker tools. Nevertheless, if I had to choose, I would opt for some other programs on this list.

  1. PlagiarismChecker.com

Don’t mistake this tool for Plagiarism Checker made by Small SEO Tools as they are different services.

Regardless, both of them are really similar in terms of features.

Plagiarismchecker.com allows you to check a text or a URL. There isn’t anything special when it comes to this software. Like most other free tools, it all comes down to copy pasting a text. Then, you will get results mentioning all the sources.

The most notable thing regarding this website is the fact it provides numerous resources.

Besides plagiarism checker, you also have articles about copyright infringement and how you can protect yourself from plagiarism. In that sense, you can find all the relevant information in one place.

  1. Copyleaks

Copyleaks works based on credits. This makes for very flexible pricing.

When it comes to the tool itself, there isn’t anything special worth mentioning; it works similar to other tools on the list and doesn’t have any special features or filters.

Best thing about it is that it has API so you are free to modify it as you see fit. There is also an add-on for Microsoft Word allowing you to check for uniqueness as you go.

Copyleaks is great for business websites and educators.

  1. Whitesmoke

Whitesmoke is another wholesome platform on my list.

It has 3 main features:

  • Grammar check
  • Plagiarism check
  • Translator

While plagiarism tool is great by itself, the other features also have to be mentioned. With this software you are able to improve content and modify it in numerous ways.

Software provides suggestion that will help you improve style and create sentences that make more sense and are better for readers. Each time tool notices something off, it will provide a list of suggestions that can be used as an alternative.

It also has to be mentioned that there are more than 100 templates which can be used for letter and various documents. If that wasn’t enough, there is also a dictionary tab.

  1. Dustball

Dustball is your ordinary plagiarism checker. It doesn’t provide much but luckily, you can use it for free.

All you have to do is copy paste your text into a box or upload it as a Word document.

If you wish, you can also download it on your computer. Thing that I don’t like about it is the fact that free version is really slow. By getting paid one, this issue is eliminated of course but this shouldn’t be the case in the first place.

My favorite plagiarism checker

To be honest, I don’t use plagiarism tools that often. Still I wouldn’t say they are useless; even if your post is completely unique and based on personal ideas, there is still a chance that exact sentences can be found online.

This is mainly due to numerous web sources being available to us. Even if you’re not trying, you are likely to copy something by simply writing articles.

Please have in mind that we all have different needs and while some will be satisfied with a basic version, others will required a more sophisticated software. Nowadays there are a lot of programs that add grammar support and can help you with writing style. These tools are really awesome and if you have the money and wish to improve quality of content, you should definitely consider them.

Every now and then I use a duplicate checker tool named Advego Plagiatus but given that it is in Russian, I didn’t want to include it in this review.

What is your own choice to check for plagiarized content? Which plagiarism checker do you use?

Share your experience in the comments below!

Also, make sure to join my Facebook community and check my YouTube channel!

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4 years ago

Hey! Great list! I’m a content writer and I need such tools all the time! A also like Unicheck and it’s worth to be mentioned in this great list of tools.

Mohamed Ali
Mohamed Ali
4 years ago

Thank you very much

4 years ago

Hey Nikolay , Amazing article.. I was searching for such tools ,Thanks for this list