Upload a PDF, Word document, or text file and check it for copied content against 250M+ academic works, Wikipedia, and biomedical articles. Get an originality score, matched sources, and side-by-side excerpts — so you can cite or rewrite before it reaches a submission box. 5 checks per month on every paid plan.
Plagiarism — presenting someone else’s work as your own without attribution — is a different problem from AI-likeness. This tool searches public academic and encyclopedic sources for matches to your text, so you can catch and fix them before submission.
Upload your draft and check it against 250M+ academic works, Wikipedia, and biomedical articles. See verbatim matches and close paraphrases before anyone else does.
Every match shows the source, a similarity score, the match type (verbatim, paraphrase, or summary), and your text alongside the source text side by side.
Drop in a PDF, Word .docx, or text file up to 25 MB. Text is extracted automatically — scanned PDFs go through OCR. Or paste text directly.
Upload a PDF, Word doc, or text file (up to 25 MB), or paste your text directly. One file per check.
We search academic works, Wikipedia, and biomedical databases for matches, then an AI model compares your text and scores originality from 0 to 100.
See your plagiarism score, a verdict, and every matched source with side-by-side excerpts so you know exactly what to cite or rewrite.
5 plagiarism checks per month come with every paid subscription. The free trial does not include plagiarism checks — upgrade to unlock them.
250M+ academic sources, Wikipedia, and biomedical databases. Originality score, matched sources, side-by-side excerpts. Included on every paid plan.
See plans and pricing5 plagiarism checks per month on every paid plan.
Is this plagiarism checker like Turnitin?
No, and we want to be honest about that. Turnitin checks against a private, institutional submission corpus we don't have access to. Humanizily's plagiarism checker searches free public sources — OpenAlex (250M+ academic works), Wikipedia, and Europe PMC (48M+ biomedical articles) — then uses AI to compare your text against what it found. It catches copied and closely paraphrased content from those public sources well, but it cannot see paywalled databases or private submission histories.
What sources does the plagiarism checker search?
Three free public databases: OpenAlex (250M+ academic works with abstracts), Wikipedia (6M+ articles, with full intro text fetched for the top matches), and Europe PMC (48M+ biomedical articles). After searching, an AI model compares your text against the results and reports verbatim matches (8+ consecutive words), paraphrases, and summaries, with the matched excerpts shown side by side.
What file formats can I upload?
PDF, Word .docx, .txt, .md, .csv, .html, and .rtf — up to 25 MB, one file per check. Text is extracted in your browser; scanned or image-only PDFs are run through OCR automatically. You can also paste text directly instead of uploading a file.
How many plagiarism checks do I get?
Plagiarism checking is a paid feature. Every paid plan includes 5 plagiarism checks per calendar month. The counter resets at the start of each month. A check only counts against your monthly limit if it completes successfully — if the checker is busy and your check fails, you don't lose a credit.
Does the plagiarism checker also detect AI-generated text?
No. Plagiarism (copied content from other sources) and AI-likeness (text written by an AI) are two different signals. This tool checks plagiarism only. For AI-likeness, use our separate free AI Detector. The two tools are independent.
Does it work in languages other than English?
The checker works on text in any language, but the sources it searches are primarily English (English Wikipedia, English-language academic databases). Coverage for Arabic, French, and other languages is weaker because fewer non-English sources are in these free databases. We're working on broadening source coverage over time.