How accurate is Scribbr’s plagiarism checker?

Extensive testing proves that Scribbr’s plagiarism checker is one of the most accurate plagiarism checkers on the market in 2022.

The software detects everything from exact word matches to synonym swapping. It also has access to a full range of source types, including open- and restricted-access journal articles, theses and dissertations, websites, PDFs, and news articles.

How can I change the settings of my plagiarism report?

You can change the settings of your report by clicking on the gear icon which is displayed just above the similarity score.

The settings allow you to exclude search repositories or ignore small matches, quoted material, or references in your bibliography.

Settings plagiarism report

What can I do if I am not satisfied with the results of the Plagiarism Checker?

Are you not satisfied with the results of the Scribbr Plagiarism Checker, or are you experiencing difficulties with the document? Find out what to do when…

  • you cannot see your plagiarism results:Try opening the results in Google Chrome, or request a PDF copy.
  • you see an error message in the header of your document:Don’t worry – you can ignore the error message.
  • you see “Error! Bookmark not defined” in your table of contents:Don’t worry – this error doesn’t affect your results.
  • you are not satisfied with your similarity score:The similarity score shows you what percentage of your text the software found in sources in the Turnitin database. That means we cannot change your score.

    However, you can reduce the similarities yourself by following our simple guides to interpreting the report and avoiding plagiarism. Then the similarity score of your submitted paper will be much lower. If you want to see your new score after following these guides, you can purchase a second check.

  • you are not 100% happy with our service:Read about our 100% happiness guarantee and fill in the feedback form. We will contact you within 24 hours.

Why did the Plagiarism Check not find my copied fragment?

If you copied a fragment from a source and the Plagiarism Check did not find it, there are four possible explanations.

You paraphrased the fragment

If you paraphrased the original text by using different words and/or changing their order, the fragment will no longer be detected by the plagiarism software.

You can test this by searching the fragment in double quotation marks on Google. If no results are returned, you successfully paraphrased. Note that you still need to cite the source of the original idea.

However, if Google did return a result but our software did not highlight it, this might mean that…

The source is not part of our database

The Turnitin database used by the Scribbr Plagiarism Checker contains 99.3 billion current and historical webpages and 8 million journal articles and books. However, it’s possible that the source you used is an inaccessible publication or a student paper that is not part of our database.

Even if you’re certain that the source is publicly accessible, it might not yet have been added to the database. Turnitin is constantly updating its database by searching the internet and adding new publications. You can expect the source to be added in the near future.

The “Exclude Small Matches” number is set too high

By default, the plagiarism report shows similarities of 9 words or more. If the fragment you copied is shorter than that, it will not be shown in the report.

You can manually adjust the minimum length in order to show shorter similarities. Find out how to do that here.

Your document was not readable

If you uploaded a PDF file, it is possible that your document is not machine readable or was converted to an image instead of text. As a result, no similarities will be found.

To test if the text in your PDF is readable, you can copy and paste the document into a text editor (e.g. Microsoft Word, Notepad, TextEdit). If the text editor shows the same text as the PDF, then the text will also be readable by our plagiarism software.

If you know that you used a fragment, but it wasn’t found by our plagiarism software, it’s best to paraphrase or quote it anyway (and be sure to cite the source). It’s always better to be safe than sorry!

What languages are supported by the plagiarism checker?

Scribbr’s plagiarism checker offers complete support for 20 languages, including English, Spanish, German, Arabic, and Dutch.

The complete list of supported languages:

  • Arabic
  • Bosnian
  • Croatian
  • Czech
  • Danish
  • Dutch
  • English
  • Finnish
  • French
  • German
  • Greek
  • Italian
  • Norwegian
  • Polish
  • Portuguese
  • Russian
  • Serbian
  • Spanish
  • Swedish
  • Turkish

I ordered the Scribbr Plagiarism Checker in combination with Proofreading & Editing. When should I start the Plagiarism Checker?

If you purchased a Plagiarism Checker in combination with our Proofreading & Editing service, you can start the Plagiarism Checker anytime at your convenience.

Scribbr recommends using the Plagiarism Checker after you have received your document and gone through all of the edits. Then you can upload the most recent version of your paper and avoid having to manually transfer changes from one document to another.