ArXiv.org does not assign DOIs to its preprints, but ResearchGate does. Are there other preprint repositories that assign DOIs for free?
@TheGuy Yes, I've assigned them to my own preprints. See: ResearchGate DOIs. Try adding a preprint here; it should let you assign a DOI.– GeremiaJun 1, 2018 at 20:02
Why do you want a DOI on sth. that is not 100% final? They are unique and permanent, so you're supposed to keep the target available in perpetuity.– KarlJun 1, 2018 at 20:31
@Karl According to ResearchGate, "DOIs help you: • Make your research citable. • Put a date on your discovery." Also, RG's "DOIs can be generated for most of your unpublished work."– GeremiaJun 1, 2018 at 21:01
8So is this question an ad for research gate or...?– user9646Jun 2, 2018 at 4:48
1I suggest editing the question to essentially "where to obtain a DOI for a preprint for free?"– Oleg LobachevJun 2, 2018 at 15:30
Although meant for data, the Zenodo repository assigns free DOIs. Nothing hinders one from uploading PDFs there.
Biorxiv (the main life sciences preprint server) gives DOIs.
ChemRxiv does that too– user64845Jun 3, 2018 at 10:24
arXiv assigns doi automatically since January 2022. And, all earlier articles have been assigned dois.
No preprint server should be charging authors any fees for DOIs? I would also +1 for BioRxiv or the Open Science Foundation has 18 different subject-based preprint repositories that might fit yours.
There is a community-curated list of preprint servers, and it takes note of which identifier is assigned to content - you can filter those by DOI.
Zenodo is a repository that assigns DOIs for free. You can access it via your GitHub account or ORCID ID.