Explainer · Plain-language

Paper Mill: Definition, Meaning & Examples | CASRAI

A paper mill is an organisation that produces and sells fraudulent research manuscripts, and often authorship slots on them, to people who want publications without doing the underlying work. Their products typically contain fabricated or manipulated data and images, recycled or nonsensical text, and manipulated citations. Paper mills threaten the integrity of the scholarly record and have driven large-scale retractions. Bodies such as the STM Integrity Hub and the Committee on Publication Ethics (COPE) work to detect and counter them.

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What paper mills are and how they operate

A paper mill is a for-profit organisation that produces fraudulent manuscripts to order and sells authorship on them. Customers pay for a finished paper, or for a named author slot on a paper destined for publication, gaining a credential without having conducted the research. Mills operate at scale and industrially: they may generate many superficially distinct papers from templates, recycle data and images across submissions, and submit to multiple journals. Some also exploit the peer-review process, for example by suggesting compromised reviewers, to ease acceptance.

Tell-tale signs: tortured phrases and fabricated data

Several recurring signals help identify mill output. "Tortured phrases" are unusual paraphrases of established terms — produced to evade plagiarism detection — that replace standard terminology with awkward synonyms. Their presence can indicate automated or disguised text rather than genuine writing. Other signs include fabricated or manipulated data and images, such as duplicated or altered figures reused across papers; results that do not match the described methods; and citation manipulation, where references are inserted to inflate certain authors' or journals' metrics rather than to support the argument. Individually these can have innocent explanations, but in combination they are strong indicators of fraud.

Detection and response: STM Integrity Hub and COPE

Because paper mills operate across many journals and publishers, countering them requires coordination. The STM Integrity Hub is an industry initiative that brings together tools and shared signals to help publishers detect problematic submissions, including suspected paper-mill activity, before or after publication. The Committee on Publication Ethics (COPE) provides guidance and resources on handling systematic manipulation, including paper mills, helping editors investigate and respond consistently. Together with screening tools and collaboration between publishers, institutions, and integrity specialists, these efforts aim to identify mill networks and correct the record.

Mass retractions and the systemic pressure behind them

When paper-mill networks are exposed, the consequences can be large: publishers have retracted hundreds or thousands of articles at once after identifying batches of compromised papers sharing common signatures. Such mass retractions are a visible symptom of the underlying problem. The demand that sustains paper mills is driven in significant part by systemic incentives — the "publish or perish" culture in which career progression, funding, and prestige are tied to publication counts. Addressing paper mills therefore involves not only better detection but also reform of how research is assessed, an aim shared with initiatives such as DORA and CoARA.

Key facts

At a glance

Definition: an organisation producing fraudulent manuscripts and selling authorship
Products: fabricated/manipulated data and images, recycled or templated text
Tell-tale signs: tortured phrases, image duplication, citation manipulation
Detection: STM Integrity Hub; guidance from COPE
Consequence: large-scale, coordinated retractions when networks are exposed
Driver: "publish or perish" pressure and metrics-based assessment

Common misconceptions

What people often get wrong

Often heard: A paper mill is just a predatory journal under another name.

Actually: No — a paper mill produces and sells fraudulent manuscripts and authorship, whereas a predatory journal is a publishing venue that charges fees without genuine review. Mill papers can appear in ordinarily reputable journals too.

Often heard: Buying authorship from a paper mill is a minor ethical lapse.

Actually: No — it is research fraud that corrupts the scholarly record, can trigger retractions, and undermines trust in published science. It is treated as serious misconduct.

Often heard: A single tortured phrase proves a paper came from a mill.

Actually: No — individual signals can have innocent explanations. It is the combination of indicators — tortured phrases, fabricated data, image duplication, and citation manipulation — that points to mill activity.

Going deeper