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Plagiarism Check for Master Theses: What You Should Know

How do you avoid plagiarism in a master thesis? How can you use plagiarism checking optimally to prevent plagiarism?

by Marco WarzechaUpdated 19 March 2026Reading time 7 min

If you are in the middle of your master's dissertation, you know how much work goes into a project like this. You research, read and write so that your findings come across as convincingly as possible. But have you thought about a plagiarism check? Many students do not realise how easily they can slip into plagiarism without meaning to. It is surprisingly easy to borrow a phrase or an idea while writing and forget to cite the source properly. No need to panic, though: below you'll find out how a plagiarism check lets you confirm that your master's dissertation contains no accidental plagiarism.

In this article we explain what plagiarism actually is, why a plagiarism check matters so much and how to run one without any fuss. With our tips you will avoid the most common traps and make sure your work meets academic requirements. That way you can hand in your dissertation with confidence and focus on what really counts: your research and the results of your hard work.

Illustration of a student using a plagiarism check to find out whether her master dissertation contains plagiarism

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What is plagiarism?

While working on your master's dissertation, you will probably spend a lot of time reading and analysing existing research. That knowledge helps you shape your own arguments and answer your research questions. But there is a trap here too: if you work other researchers' words or ideas into your text without making that clear, you are committing plagiarism. In other words, you are passing off someone else's intellectual property as your own. With master's dissertations, which are often more extensive than undergraduate ones and demand more independent work, the pressure can be especially high. The risk of plagiarising by accident rises when you are stressed or lose track of your sources.

What types of plagiarism are there?

There are several types of plagiarism. They include complete plagiarism, where an entire piece of work is copied; translation plagiarism, where texts in another language are translated and used without a reference; and copy-and-paste plagiarism, where passages from other works are taken over word for word without being marked as quotations. Other forms are paraphrasing without a reference, ghostwriting, plagiarism of ideas, plagiarism of structure, careless citation and self-plagiarism, where you reuse your own earlier work without saying so. Every one of these undermines the authenticity and academic integrity of your work, which is why careful citation and the originality of your research are essential.

Dealing with your own texts from past assignments

Reusing text you have already submitted for an earlier assignment counts as self-plagiarism. Self-plagiarism is a problem because it breaks the assumption that every piece of submitted work has been produced originally and specifically for the current assessment. To avoid it, cite your own earlier work as a source whenever you draw on it, exactly as you would with anyone else's. This shows that you know where the ideas come from and are handling them transparently.

What happens if your work contains plagiarism?

UK universities treat plagiarism as academic misconduct and investigate it under their own procedures. UCL, for example, lists plagiarism and self-plagiarism explicitly among the conduct it investigates and penalises. Depending on how serious the case is, the outcome can range from a reduced mark to a failed dissertation and, in the worst case, exclusion from the university. That makes it all the more important that your master's dissertation is completely free of plagiarism, and a plagiarism check is a great way to hand it in with peace of mind.

Illustration of a student writing her master dissertation and looking at the stages of the process

What is a plagiarism check and why does it matter for a master's dissertation?

A plagiarism check is a digital process that helps make sure an academic text, such as a master's dissertation, is original and authentic. Specialist software compares your text systematically with a large database of published work. Depending on the provider, that database can include journal articles, books, conference papers, online sources and other dissertations. The aim is to find matches, or “hits”, that could point to sources that have not been cited properly or to potential plagiarism. With GoThesis you can check your dissertation for plagiarism online.

The check helps you confirm that your dissertation is original and that every source you used is cited correctly. That matters not only for avoiding academic misconduct but also for the integrity and quality of your work. Universities use specialist software to check submitted work for plagiarism too. By running a check yourself, though, you can act first and make sure your dissertation meets these standards. A thorough check helps you spot and correct unintentional mistakes before you submit, so you avoid consequences such as a poor mark or, in the worst case, an academic penalty.

How do you run a plagiarism check on your master's dissertation?

Running a plagiarism check on your master's dissertation is easier than ever thanks to the many online tools available. They scan your text and compare it with a broad pool of academic publications, books, articles and web sources, looking for matches that could point to incorrectly cited sources or outright plagiarism. This is how the process usually works:

  1. Upload your text: choose the plagiarism checker you prefer and upload your dissertation. Accepted formats vary, but Word documents and PDFs are usually fine, and sometimes plain text files as well.
  2. Start the check: the software now scans your work and compares it with the sources available to it.
  3. Analyse the results: once the check is finished, you receive a report. It shows where potential plagiarism was found and often gives a similarity score indicating how much of the text may have been copied.
  4. Correct any plagiarism: go through the highlighted passages carefully. If you find you have cited something incorrectly by mistake, you can fix it now. It is important to mark both direct quotations and paraphrased content correctly.

Example: let's say you have written a chapter on the financial impact of climate change on agriculture. The plagiarism check shows a high match with an article that has already been published. You go back over your text and realise you forgot to mark a quotation as such. Now you can put that right and protect the integrity of your master's dissertation.

Choosing the right plagiarism checker

When choosing a tool, keep a few factors in mind:

  • Data protection: choose a tool that handles your data securely and does not store or share it without your consent. Ideally the service complies with the UK GDPR and the EU GDPR, and its servers are located in the UK or the EU.
  • Size of the database: the more comprehensive the database, the more likely the tool is to recognise lesser-known sources too.
  • Cost: there are free and paid tools. Free tools often limit the number of words per check or offer fewer features.

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Check for plagiarism easily with this privacy-friendly tool

The GoThesis plagiarism and AI check:

AI and plagiarism check for dissertations at GoThesis

You can check your dissertation with GoThesis in just a few steps, whether it is an undergraduate or a master's dissertation. Upload your work and you will receive a detailed analysis in no time, so you can hand it in with confidence.

The three steps at a glance:

  1. Open the GoThesis AI and plagiarism check.
  2. Upload your final dissertation.
  3. Receive a detailed PDF report by email showing plagiarism and detected AI-generated text.

Note: if you are still looking for the right topic for your dissertation, GoThesis can suggest one too. Enter your interests, your degree programme and other details, and the AI will propose a topic that fits your requirements.

The advantages of the GoThesis AI:

  • Generate a personal topic for free in a few clicks
  • No registration needed
  • Table of contents, research questions and more on request
  • Comprehensive thesis guide to support your work
  • Online plagiarism check with a large database, including a PDF report

Summary:
The GoThesis AI offers solid support for the first steps of a dissertation, whether you need a research proposal or other help. Try the GoThesis AI tools now.

Tip: Looking for more tools that don't necessarily rely on AI? We introduce 26 useful tools and apps for your studies.

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