How to check a dissertation or paper for plagiarism

Checking your work yourself before a defense or journal submission saves you from an unexpected score. Below are the steps to run the check properly and use the result.

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1. Find out the requirement

The minimum originality and which system's result is accepted are set separately by each university, council or journal. Ask your supervisor or department for the written requirement — it is the most reliable source.

2. Prepare the file

Upload a text-based DOCX or PDF — scanned image PDFs cannot be read. Keep the reference list and quotations in place: they are shown separately in the result. A large work (for example 150–600 pages) is checked in full, in parts, in PlagiatX.

3. Read the result sentence by sentence

The overall percentage alone is not enough: see which sentence matches which source. Red sentences match a source; yellow ones are likely AI-written. A properly formatted quotation is not plagiarism, but its share should not be excessive.

4. Fix honestly and check again

Rewrite the flagged parts in your own words, with your own analysis and a reference to the source. Synonym swappers and "humanizer" services damage the text, and an experienced reviewer will notice. After editing, check again and see how the score changed.

5. What to check besides plagiarism

A committee looks at more than the percentage: structure, the elements of the introduction, tasks matching conclusions and citations matching the reference list also matter. PlagiatX has a separate "Thesis review" service for this: every issue with its page and quote, with a plagiarism and AI check included.

Questions

Which plagiarism checker's result is accepted?

That is up to the university or journal. Many look at results from several systems; get the exact answer from your department or the editorial office.

Will my checked work become a source for others?

No. In PlagiatX a checked text is added to the database only with your consent.

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