Frequently asked questions

One credit is one complete check — similarity and AI-content — of up to 20,000 words. Longer documents use one more credit per additional block of words.

See the Pricing page.

Yes — department, campus-wide and consortium agreements with volume pricing, single sign-on, LMS integration and your choice of data region. Contact us from the Pricing page for a tailored quote.

Plans sometimes carry a limited-time offer, and you can enter a promo code at checkout. The larger of the two applies.

Prices are set in US dollars and exclude tax. VAT, GST or sales tax for your location is calculated at checkout and shown on your invoice.

Yes, from Billing at any time. You keep access until the end of the paid period.

Yes. Besides exact and lightly edited matches, PlagCheck compares meaning sentence by sentence with a multilingual AI model, so text reworded by a paraphrasing tool, or translated from a source in another language, is highlighted and labelled as paraphrased or translated.

Some people try to fool checkers with hidden characters, look-alike letters from other alphabets or spaced-out words. PlagCheck ignores these tricks when matching and tells you when it found them.

More than 40 languages, each with its own matching rules: English, Spanish, French, German, Portuguese, Italian, Dutch, Chinese, Japanese, Korean, Hindi, Bengali, Tamil, Marathi, Urdu, Arabic, Persian, Hebrew, Russian, Ukrainian, Polish, Turkish, Indonesian, Malay, Vietnamese, Thai, Filipino, Swahili, the Nordic languages and more, plus te reo Māori and Pacific languages. Each report states how reliable AI-content detection is for its language.

Yes. We detect the mix of languages and report the breakdown. Text with or without macrons, or with double vowels, is matched consistently.

You, your organisation's administrators or instructors if you submitted through an organisation, and authorised support staff (access is logged). Other users never see your text.

In the hosting region chosen by the operator of this service — for example the EU, the United States, Australia or New Zealand. The location is shown in the footer and privacy policy, and documents stay in that region.

The platform is designed for the EU and UK GDPR, US state privacy laws and FERPA, Canada's PIPEDA, Australia's and New Zealand's Privacy Acts and similar laws elsewhere: data export and deletion, retention controls, consent records, encryption and audit logs are built in. See the Privacy and Security pages.

Until you delete them, or for the period your organisation or our retention schedule sets. See the Data retention page.

Open the document and choose Delete. This permanently removes the file, its text, fingerprints and reports.

It is the share of words in your document that match text in our sources. A match is not automatically plagiarism: quotations and common phrases also match. Read the highlighted passages and check that they are cited.

Every check searches previous submissions and the reference library, Wikipedia, scholarly indexes (Crossref, Europe PMC, DOAJ, arXiv, Semantic Scholar), journal publishers' websites (Elsevier, Springer Nature, MDPI, Taylor & Francis, Wiley and many more) and the public web. It also finds paraphrased and translated passages. Each report lists the sources that were searched. Paywalled articles are compared by their abstract and public page.

AI-content detection is probabilistic. Each report shows a reliability level for the document's language and length. It should start a conversation, never be the only evidence for a decision.

Every page of a PDF report is watermarked and shows a verification code. Enter the code at /verify to confirm the report was issued by PlagCheck and see its headline figures.