Preprint
A preprint is a public version of a research manuscript shared before formal journal peer review and publication.
What a preprint is
A preprint is a complete research manuscript posted on a public server before it has completed journal peer review. It usually looks much like a journal article, with authors, methods, results, figures, references, and a discussion. The key difference is status: readers should treat it as research shared for early access and scrutiny, not as a final certified publication.
Why researchers post preprints
Journal review can take months or longer. A preprint lets researchers share findings quickly, claim priority for an idea or discovery, receive comments, support grant or job applications, and make work available to people who cannot wait for formal publication. In fast-moving fields, early sharing can change how quickly a community learns.
Preprint servers
Preprints are usually hosted by subject or general servers. arXiv is well known in physics, mathematics, computer science, and related fields. bioRxiv and medRxiv serve life sciences and health-related work, while other servers support disciplines such as psychology, social science, education, engineering, and Earth science. Servers may screen submissions for basic fit and safety, but they are not journals.
Relationship to peer review
A preprint can later be submitted to a journal, revised, accepted, rejected, or never formally published. Some journals allow or encourage preprint posting, while policies vary by field and publisher. After peer review, the journal version may differ from the preprint because authors respond to criticism, add analysis, correct errors, or change interpretation.
How readers should use them
Readers should check whether a manuscript is a preprint, whether a later journal version exists, whether the methods support the claims, and whether experts have commented on it. Preprints can be valuable evidence, but they require extra care in medicine, public policy, finance, and other areas where premature claims can cause harm.
Benefits for open science
Preprints support open science by making research visible earlier and allowing wider discussion. They can reduce publication delay, increase transparency, and let researchers without subscription access read new work. Some communities also use preprints to connect manuscripts with open reviews, data, code, and post-publication commentary.
Risks and responsibilities
The main risk is misinterpretation. News coverage, social media, or policy debates can treat a preprint as settled knowledge before it has been carefully checked. Authors, servers, journalists, and readers all share responsibility for labeling status clearly, correcting mistakes, and avoiding overclaiming.
Why it matters
Preprints change the timing of scholarly communication. They let research circulate before journals finish their slower certification work, which can make science faster and more open while also making careful interpretation more important.