The free report tells you if your text contains potential plagiarism and other writing issues. The premium report gives you the resources you need to review issues in detail and resolve them.
| Free report | Premium report (from $19.95) |
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Plagiarism Checker
Grammar Checker
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Plagiarism Checker
Grammar Checker
AI Detector
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Scribbr’s free plagiarism checker estimates the risk of plagiarism by calculating the percentage of text in your document that’s similar to other sources.
A moderate or high risk of plagiarism means that the plagiarism software detected several similarities worth reviewing.
Note that similarities are not necessarily plagiarism. You will need to decide on your own whether your text needs revision or citation.
Information can often be found in more than one place. For this reason, other sources citing the same information you used can come up in your Sources Overview.
The important thing is to make sure you’ve cited the source of the material. Try to find the original source, but if you can’t find it, it’s best to cite the source where you found the information.
Similarities in your document are highlighted for quick and easy review. Each color corresponds to a source in your Sources Overview at the right side of your report.
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.
No, you will never get a 100% match because the Scribbr Plagiarism Checker does not store documents in a public database.
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.
No, the Self-Plagiarism Checker does not store your document in any public database.
In addition, you can delete all your personal information and documents from the Scribbr server as soon as you’ve received your plagiarism report.
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…
If you copied a fragment from a source and the Plagiarism Check did not find it, there are four possible explanations.
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 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.
To cater to this, we have the Self-Plagiarism Checker at Scribbr. Just upload any document you used and start the check. You can repeat this as often as you like with all your sources. With your Plagiarism Check order, you get a free pass to use the Self-Plagiarism Checker. Simply upload them to your similarity report and let us do the rest!
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.
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!