Preprints: Accelerating Research

1. What Is a Preprint?

Preprints Have Not Been Peer Reviewed


Peer Review in the Stages of Printing Stages of printing showing preprint to Author Manuscript with Peer Review emphasized

Peer review is a required step for original research to go through before being published in a scholarly journal. A formal peer review process typically involves scientific and editorial review from other researchers with relevant expertise. The result from this review may be one of the following:

  • Recommending the manuscript for publication
  • Rejecting the manuscript
  • Offering suggestions for improvement for a second review

Manuscript authors often then take these comments and rework their paper to address the issues identified. Peer review is intended to ensure high quality and careful considerations for rigorous research.

Because peer review is not a requirement for the public posting of preprints, repositories, servers, and indices post clear warnings about this distinction on their platforms. On PubMed Central® (PMC) , this distinction is made clear on each preprint by a large banner at the top of the article denoting that peer review has not occurred yet. Other preprint servers, such as medRxiv , also denote this on their home page and each article record.

Preprint Banner in PubMed Central Screenshot from bioRxiv database showing preprint banner on article