What Are Plagiarism Checkers?

31.03.23 Plagiarism checker Time to read: 6min

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Plagiarism has become an extremely worrying issue in higher education in the majority of countries. The number of students’ assignments with apparent instances of plagiarism appears to increase exponentially.

It is attributable mainly to the proliferation of the internet and digital technology, the increasing workload of professors, a total and absolute disregard for copyright, and a decline in academic culture or the fear of expulsion.

Consequently, numerous educational institutions continue to recognize the importance of adopting a severe policy of plagiarism prohibition and employing stringent steps to identify it promptly. Plagiarism checkers can be helpful tools to do so.

Plagiarism Checkers – In a Nutshell

Even though plagiarism is not everyone’s cup of tea, it can be prevented. Being accused of plagiarism, especially when it’s a matter of carelessness, may be incredibly upsetting. Writing a technical or scientific article demands mastering the correct citation of sources.

  • Always utilize plagiarism checkers for peace of mind.
  • The internet offers a variety of options for detecting plagiarism, some of which are free.
  • However, if you are writing a substantial document, such as a master’s thesis or dissertation, you may wish to employ professional plagiarism checkers.
  • Using your instincts is the greatest approach to finding a trustworthy plagiarism detector. If you are skeptical of a software provider detecting plagiarism, you can never go wrong with such intuition.
  • There are numerous anti-plagiarism software suppliers available. You can never go wrong if you study and consider the criteria outlined in this article.

Definition: Plagiarism checkers

Plagiarism checkers employ sophisticated database tools to search your content for matches with existing materials. Universities utilize them to evaluate student papers. You can also use professional plagiarism checkers to examine your work before submission.

Plagiarism checkers browse and index web information, comparing your writing to a database of already-existing web content to identify instances of similarity. Exact matches are highlighted using keyword analysis.

The checker displays a plagiarism percentage on the user’s end, flags the plagiarism instances, and cites the sources.1

How to avoid point deductions

Point deductions can also be caused when citing passages that are not written in your own words. Don’t take a risk and run your paper through our online plagiarism checker. You will receive the results in only 10 minutes and submit your paper with confidence.

To the plagiarism checker

Differences between plagiarism checkers

While most plagiarism checkers operate similarly, there are variances between them that influence the types of plagiarism they can identify.

Database size

Not all plagiarism checkers share the same database. This can result in substantial variations in outcomes.

Typically, free plagiarism checkers have limited databases. This indicates significant gaps in their capacity to locate matches, particularly with less accessible internet content. The highest-quality plagiarism detectors have more extensive databases, which improves their ability to find matches.

Quality of scanning

Likewise, the quality of the scanning software varies widely. Many free checkers can only identify precise matches. These checkers are unlikely to flag your work if paraphrased too closely or neglected to include a citation.

Quality plagiarism checkers use ‘fingerprinting’ to detect non-exact matches between paraphrased and altered material. Here, the software examines pieces of sentences to identify structural similarities.

Similar to an actual fingerprint, each fragment of your text should be unique and distinct from existing document fingerprints. These checkers are capable of identifying matches if they exist.

Plagiarism checkers: Cost-free vs. chargeable

When searching the internet for plagiarism checkers, you will find two options: professional detectors that charge a fee and free plagiarism checkers.

Each alternative has its benefits and drawbacks, so you should carefully examine the two choices.

Free Plagiarism Checkers

Today, the Internet is inundated with service providers that offer free plagiarism checkers. No one can be faulted for choosing a free checker, but it is essential to be aware of the disadvantages of the free ones.


  • No costs


  • Vague data protection policies
  • Untrustworthy service providers
  • Hidden fees for the complete software package
  • Word count and character constraints

The apparent benefit of free plagiarism detection is that it will save you money. However, you risk your document’s authenticity not being adequately verified.

Most free plagiarism checkers are based on subpar algorithms that check only a few phrases of your work. Your dissertation or thesis may contain unintentional instances of plagiarism.2

It would be best to employ a professional, fee-based plagiarism detector for important academic assignments, such as a master’s thesis or dissertation. Remember that paying for the verification of your research paper is an investment worth making.3


  • Finds considerably more instances of plagiarism than free tools
  • Identifies instances of plagiarism even in documents that have been altered
  • Will not store or sell your files
  • Money-back satisfaction guarantee with available live support
  • Self-Plagiarism Checker enables the detection of self-plagiarism


  • Not free

What cannot be detected by plagiarism checkers?

Although plagiarism checks are constantly changing and becoming more accurate, they cannot yet identify everything.

Ideas and non-text plagiarism

If an idea has been thoroughly reworked or translated, it can be difficult for plagiarism checkers to recognize it as plagiarized. They cannot also assist with other non-textual forms of plagiarism, such as the plagiarism of photographs.

Other non-text items such as translated writings and ideas are also a source of plagiarism, with the same negative implications as more readily detectable forms of plagiarism.

Text from internal databases

Most educational institutions have their in-house database of uploaded work from current and previous students in addition to the usual plagiarism checkers they use.

Typically, this database is not shared with third parties. This means that your educational institution, and not a commercial plagiarism detector, will likely be the only entity capable of identifying instances of student plagiarism.

Even said, educational institutions sometimes allow other institutions to access their internal database to better detect plagiarism and other forms of academic dishonesty among students. Self-plagiarism and submitting a friend’s work as your own are still considered plagiarism and have the same repercussions.1


Plagiarism is passing off another person’s work as one’s own. Institutionally distinct meanings of plagiarism exist within educational contexts. Plagiarism is regarded as a breach of academic and journalistic integrity.

As a rule, plagiarism should be kept to 15% of the article/paper/overall essay’s word count. When quoting another source word-for-word, it is standard practice to include citations.

Copying from books, articles, websites, or another student’s paper and passing it off as your own is deliberate plagiarism. Alternatively, accidental plagiarism can arise in a variety of ways:

  • Citing another author’s work incorrectly
  • Failure to paraphrase another’s work, even while properly citing it
  • Reusing your own earlier articles and accidentally presenting them as a new concept

The accuracy relies on the plagiarism detection software you employ. Numerous free plagiarism checkers do not detect all instances of plagiarism or incorrectly label content as plagiarized.

Plagiarism checkers use sophisticated database tools to look for similarities between your writing and previously published material. For them to be accurate, the algorithm (which identifies plagiarism) and the database size must be considered (with which your document is compared).4


1 Bailey, Jonathan. “The Limitation fo Every Plagiarism Checker.” PlagiarismToday. December 07, 2011. https://www.plagiarismtoday.com/2011/12/07/the-limitation-of-every-plagiarism-checker/.

2 Evans, Magie. “The Pros And Cons Of Using A Plagiarism Checker For Teaching Or Learning.” FreeYork. March, 2022. https://freeyork.org/r/the-pros-and-cons-of-using-a-plagiarism-checker-for-teaching-or-learning/.

3 Werner, Maxime. “What Is The Importance of Using a Plagiarism Checker to Check Your Thesis?” SkillsYouNeed. Accessed March 21, 2023. https://www.skillsyouneed.com/rhubarb/plagiarism-checker-thesis.html.

4 Quetext. “Plagiarism Checker by Quetext.” Accessed March 21, 2023. https://www.quetext.com/plagiarism-checker.


Lisa Neumann

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About the author

Lisa Neumann is studying marketing management dual at IU Nuremberg and working towards a bachelor's degree. She has already gained practical experience and regularly writes scientific papers during her studies. For these reasons, Lisa is a perfect fit as a BachelorPrint employee. In this role, she emphasizes the importance of high-quality content and wants to help students navigate their stressful lives. Being a student herself, she knows what matters and what is important.

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