Plagiarism detector: learn how to check academic papers – Link


Committing plagiarism – sometimes even without intention – is a student’s nightmare

Often, when writing an academic paper, it is difficult to know when the quote or reference used can become a copy of someone else’s creation, incurring plagiarism – which is considered a crime of copyright in Brazil.

This week, a possible case of plagiarism involving the master’s thesis of Kassio Nunes Marques, President Jair Bolsonaro’s nominee for a future vacancy in the Federal Supreme Court (STF), rekindled this concern among students. But technology can help those who don’t want to be accused of anything: several websites and software plagiarism detector.

But what is even considered plagiarism?

According to the copyright law in force in Brazil today, it is considered plagiarism:

– Cite someone else’s work in the text, without citing the source;

– Paraphrase the work written by someone else, changing some of the words

– Use someone else’s ideas without referring to the author

– Copy and paste a text from the internet and present it as your own

How do these plagiarism detection services work?

Most services are available on online sites or on software that can be downloaded to a computer. Most of them have a very simple operating system: from a text selected by the user, they search the internet and file repositories to understand if the same text has been written before.

It is a system that serves mainly to detect the first case of plagiarism mentioned above, with an exact copy of the words. In order to capture similar paraphrases or reasoning, a system of machine learning and language processing is necessary, capable of understanding similar constructions and synonyms – which is much more advanced and demands much more processing.

Can you trust these plagiarism detection services?

If your intention is to check if a work was copied directly from the internet or if it cites the work of a previously published article, these softwares will do the job.

If the idea is to understand if there was a paraphrase or use of someone else’s ideas – the famous “copy, but it doesn’t do the same” -, it is necessary to check the specifics of each service.

Free plagiarism detectors

With support for more than 190 languages, allows the user to paste the text, a URL or a file from Google Drive to check if it commits plagiarism on the network. It is free and supports not only text files, but also spreadsheet and presentation files, as well as epub, a format used for e-books.


THE stroke is a free site that scans the internet for excerpts similar to the original work. It has instant results and brings a timeline as a differential, which lets you know when each copy was published on the network.


Created in Brazil, the program free it has a simple system and can be used in both Portuguese and English. THE CopySpider it also allows the user to choose the level of rigor he wants to perform in his search.

Paid plagiarism detectors

Check for

Available on the internet, the system payment do Check for has the ability to scan multiple files and scan not only on the internet, but also on scientific articles, magazines and newspapers, which often have paid access. Need registration.

Turn It In

One of the most popular platforms for academic papers, Turn It In uses a base of 60 billion websites, 600 million school papers and 150 million scientific articles to make their comparisons. It is available in Portuguese and also works on mobile phones and tablets, but it is paid.

AntiPlagiarist & AntiCutandPaste

Developed by the same company, the two services allow copy checking in several ways. The first is more suitable for academic work and allows checking multiple documents at the same time – in formats such as Word, PDF, HTML and RTF. The second is used to check excerpts in which programming code was copied, pasted and changed, for languages ​​such as C ++, Java, Visual Basic, Delphi, among others. Both can be downloaded for Windows and Linus and have free trials. The version pay do AntiPlagiarist custa US$ 10; a do AntiCutandPast, US$ 20.


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