A preprint is:
A preprint is a scholarly manuscript posted by the author(s) in an openly accessible platform, usually before or in parallel with the peer review process. Source: COPE.
A scientific manuscript that is uploaded by the authors to a public server. The preprint contains data and methods, but has not yet been accepted by a journal. Source: ASAPBio.
A complete written description of a body of scientific work that has yet to be published in a journal. Typically, a preprint is a research article, editorial, review, etc. that is ready to be submitted to a journal for peer review or is under review. It could also be a commentary, a report of negative results, a large data set and its description, and more. Source: Bourne PE, Polka JK, Vale RD, Kiley R. Ten simple rules to consider regarding preprint submission. PLoS Comput Biol. 2017 May 4;13(5):e1005473. doi: 10.1371/journal.pcbi.1005473.
A version of a scholarly or scientific paper that precedes formal peer review and publication in a peer-reviewed scholarly or scientific journal. The preprint may be available, often as a non-typeset version available free, before and/or after a paper is published in a journal. Source: Wikipedia.
|Preprint||Manuscript before peer review.|
|Postprint||Manuscript after peer review that includes changes made by the author as a result of the peer review process; also called the final, peer-reviewed manuscript version.|
|Galley Proof||The publisher's draft copy of the published version sent to the author for review before publishing.|
|Final||The publisher's final version of the manuscript that includes the DOI, publisher icons, pagination, graphics, etc.; also called the "version of record.|
The National Library of Medicine (NLM) launched a pilot project to test the viability of making preprints resulting from NIH-funded research related to SARS-CoV-2 virus and COVID-19 research available via PubMed Central (PMC) in 2020. Over 3,300 preprint records were added during Phase 1 with over 4 million views in PubMed Central. Phase 2 of the project will start in early 2023 to include all NIH-funded preprints. For more information: