cnXiv (pronounced "cn-archive") is a online archive and distribution service for unpublished preprints in almost every field of the sciences. It is operated by EDF Solutions Inc., a electronic data function company. By posting preprints on cnXiv, authors are able to make their findings immediately available to the scientific community and receive feedback on draft manuscripts before they are submitted to journals.

Articles are not peer-reviewed, edited, or typeset before being posted online. However, all articles undergo a basic screening process for offensive and/or non-scientific content. No endorsement of an article's methods, assumptions, conclusions, or scientific quality by EDF is implied by its appearance in cnXiv. An article may be posted prior to, or concurrently with, submission to a journal but should not be posted if it has already been published.

To request an article be posted on cnXiv.org, you agree with paying $1 for service fee through the PayPal.