Free plagiarism checker
Paste a passage of your work and instantly see whether a few sentences already appear on the web. It's a quick sample — the full-document check lives in your account.
PDF, DOCX or TXT up to 15 MB · your file is not stored
A support tool — it does not replace a professional's assessment.
How the online plagiarism checker works
Compared against the web in seconds
The tool splits your text into sentences and compares each one against billions of pages indexed on the web. When a sentence from your thesis, paper, essay or assignment already appears published somewhere else, it's flagged and the original source is shown with a link. It's a quick, free sample — no login, nothing to install.
Catches verbatim copying and paraphrasing
Beyond identical copying, the checker uses textual similarity to flag passages reworded with different words but the same structure — so-called "disguised copying". That's why it often finds plagiarism a manual Google search would miss.
Safe and your text isn't stored
Whatever you paste or upload is used only for that check and is not kept on our servers. You don't need an account to try it. To check the whole document, with full coverage and an originality report, the full analysis lives in your free account.
Frequently asked questions about plagiarism checking
- Is the plagiarism checker really free?
- Yes. The quick sample that compares a few sentences of your text against the web is free and requires no sign-up. The full-document analysis is available in the free account.
- Do I need to sign up or install anything?
- No. You paste your text or upload a PDF, DOCX or TXT right in the browser and get the result instantly — no login, no software to install.
- Does it work for theses, dissertations, papers and essays?
- Yes. The tool works for any academic work or text — thesis, dissertation, research paper, review or essay.
- Does the tool detect paraphrasing and reworded copying?
- Yes. Beyond identical copying, it uses textual similarity to flag passages reworded with different words that keep the same structure as the original source.
- Is my text stored?
- No. The text you submit is used only for that check and is not kept on our servers.
- What's the difference from the full analysis?
- The free version checks a sample of sentences. The full analysis, in your account, covers the entire document, searches in depth and generates a detailed originality report with every source.