Plagiarism Checker (Wikipedia, Open Research & Your Files)
Which passages of your text appear in Wikipedia, open research or your own sources?
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- Free preview: the overall match percentage and the counts, with the first half of the matched passages (up to 3) and where they were found.
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Your text
Where to search
Titles and abstracts in OpenAlex; abstracts and open-access full texts in Europe PMC.
Your own sources
Options
When you press Check, up to 60 phrases of 8 words from your text are sent from your browser as searches to the services you chose. Your text itself is not uploaded: what they find is compared with it on this device.
Checking…
The text or the options changed since this check. Check again to update it.
Matched passages
Sources with matches
| Source | Compared | Share of your text | Words | Open |
|---|
Side by side
- Matched passage
- Matched, lightly edited
- Left out (quotation or reference list)
Your text
Source
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About the Plagiarism Checker (Wikipedia, Open Research & Your Files)
Paste a text or open a Word, PDF or text file of up to 10,000 words, and the checker looks for its passages in Wikipedia, in open-access research (titles and abstracts in OpenAlex, abstracts and open-access full texts in Europe PMC) and in your own sources — the files or texts you add. It picks the most distinctive eight-word phrases of every paragraph, searches for them as exact phrases, downloads the articles those searches find, and aligns each one with your text to mark the passages that are identical or only lightly edited.
The report gives the share of your text found in those sources, each source’s share, every matched passage with where it was found, and the two texts side by side. Quotations and the reference list can be left out, so properly quoted and cited text does not count. It does not search the whole web or paywalled databases: it tells you what these open sources contain, not everything that exists.
How to use it
- Paste your text, or choose a Word (.docx), PDF, OpenDocument, RTF, HTML, Markdown or text file. The page shows how many words will be checked (up to 10,000).
- Choose where to search: Wikipedia (pick its language) and open-access research. Add your own sources if you have them — a classmate’s essay, a website you saved as a file, a chapter of a book.
- Leave “Ignore quotations” and “Ignore the reference list” on to count only uncited text, and pick the shortest passage to report (8 words by default).
- Press Check for plagiarism. The phrases are searched one request at a time, so a long text takes a little while; Stop ends the searches and checks what was found so far.
- Read the overall share and the matched passages; select one to see it beside the source. Without a pass the free preview shows the share, the counts and the first matched passages; a pass or Ways to unlock gives every source, the side-by-side view of all matches and the text, PDF and CSV reports.
Examples
“Chlorophyll is any of several related photochemical catalysts and green pigments found in cyanobacteria and in the chloroplasts of algae and plants.” (pasted into an essay without quotation marks)
Matched passage of 22 words, found in the Wikipedia article “Chlorophyll”
Your text: “… plant drought tolerant millet varieties, because their deep roots …” · source: “… plant drought tolerant millet types, because their deep roots …”
One passage marked “edited”: the exact runs on either side of the changed word are joined, so the change does not hide the match
The same Wikipedia sentence inside quotation marks, with “Ignore quotations” on
0% for that sentence: quoted text is left out of the check
Common uses
- Students checking an essay or thesis chapter for passages they forgot to quote or cite before handing it in.
- Teachers checking an assignment against Wikipedia and against sources they collected.
- Writers and editors checking an article for text lifted from Wikipedia or from research abstracts.
- Researchers checking a draft for sentences that repeat published abstracts too closely.
How the check works
Your text is split into paragraphs and sentences. In each paragraph the checker picks runs of eight words that stay inside one sentence and are made of long, uncommon words rather than “the”, “of” and “and” (one run per paragraph, one more for every further 120 words, up to 60 in all). Those runs are searched for as exact phrases, a few at a time, in Wikipedia’s search, in OpenAlex (titles and abstracts) and in Europe PMC (abstracts and open-access full texts).
The Wikipedia articles and open-access papers found most often are downloaded, and each is compared with your whole text by the same matcher as Document Similarity Checker: every shared run of at least the chosen number of words is found and grown to its full length, the longest first, so no word is counted twice. Runs that follow each other in both texts with up to three changed words between them are joined into one passage marked “edited”.
Reading the percentage
The overall share is the number of your compared words inside matched passages divided by all your compared words; a word found in two sources counts once. Each source’s share is the part of your text found in that source alone. No percentage decides whether something is plagiarism: one long passage copied word for word matters more than many short stock phrases, and a high share made of properly quoted, cited text is no problem at all. Read every match and check that it is quoted and cited.
What it searches, and what it cannot
- Wikipedia, in the language you pick.
- OpenAlex: titles and abstracts of scholarly works, open data about hundreds of millions of papers, books and theses.
- Europe PMC: abstracts, and the full texts of open-access articles, in the life sciences and medicine.
- Your own sources: the files and texts you add, compared in full on your device.
It does not search the whole web, news sites, essay banks, or paywalled journals and books, and it cannot see a paper’s full text unless Europe PMC has it as open access. A clean result means none of these sources contains your passages, not that the text is original everywhere.
MySmartCoPilot is not affiliated with or endorsed by Wikipedia, OpenAlex or Europe PMC; the checker uses their public search services.
Limitations
- Up to 10,000 words at a time; check a longer thesis chapter by chapter.
- Only Wikipedia, OpenAlex, Europe PMC and your own sources are searched: not the whole web or paywalled databases.
- Paraphrases, translations and reordered sentences are not found; only identical and lightly edited passages are.
- The searches use phrases from your text, so a passage that none of the picked phrases comes from can be missed when its source is not among the articles downloaded.
- OpenAlex allows each internet connection a daily number of searches; when it is used up, OpenAlex is left out until the next day and the page says so.
- Scanned PDFs have no text layer: make them searchable with OCR first.
Privacy
Sends data to online services
Your document stays on your device. Only the short phrases the checker picks are sent, as searches, to Wikipedia, OpenAlex and Europe PMC, from your browser and without cookies; the articles they find are downloaded and compared on your device. Your own sources are never sent anywhere. Only your option choices are remembered in this browser.
Frequently asked questions
What do I get without a pass?
Without a pass, Plagiarism Checker (Wikipedia, Open Research & Your Files) shows the overall match percentage and the counts, with the first half of the matched passages (up to 3) and where they were found. Until you unlock it, the result can’t be downloaded or copied. A Pro, Premium or Ultimate pass, a one-time payment that never renews, unlocks the full result. The pricing page lists the passes and their prices.
Is this a full internet plagiarism check?
No. It searches Wikipedia, open-access research (OpenAlex and Europe PMC) and the sources you add, which covers a large share of what students and writers copy from, but not the whole web or paywalled journals. The page says exactly which sources were compared.
Is my essay uploaded or stored?
No. The checker sends only short phrases from it as searches, the way you would type them into a search box, and compares the articles it finds with your text on your device. Nothing is stored on a server.
What percentage counts as plagiarism?
None by itself. Your school or publisher decides what is acceptable. A high share made of quotations you cite is fine; one uncited paragraph copied word for word is not, whatever the percentage. Turn on “Ignore quotations” and read each matched passage.
Why is a passage marked “edited”?
Because it matches the source except for up to three changed words in a row — a swapped synonym, an added adjective. Light rewording like that still counts as copying in most academic rules.
Can I check against my own files?
Yes. Add Word, PDF or text files (or paste texts) under “Your own sources”, for example the articles you read for the essay, and the checker compares them with your text in full, on your device.
Does it find paraphrased text?
Only light edits, where most of the words stay in the same order. Text rewritten in other words or translated from another language is not found.