Predatory journals take advantage of authors by asking them to publish for a fee without providing peer-review or editing services. Predatory publishers do not follow proper academic standards for publishing. The turnaround time on publishing a manuscript is unusually quick.
It is important to be aware of the warning signs. Speak with your faculty, mentor, or librarian before submitting a manuscript.
Always, always investigate the legitimacy of a journal before publishing in it. Screen the publishers that you have not heard of before, or if their offer is "too good to be true".
(Adapted from Shamseer, L., Moher, D., Maduekwe, O., Turner, L., Barbour, V., Burch, R., Clark, J., Galipeau, J., Roberts, J., & Shea, B.J. (2017). Potential predatory and legitimate biomedical journals: can you tell the difference? A cross-sectional comparison. BMC Medicine 15(1) 28. https://doi.org/10.1186/s12916-017-0785-9.)
Open Access journals may solicit authors to publish for a fee but maintain high standards for peer review and editing. The goal of Open Access is to remove barriers (paywalls, etc.) to publishing.
The following are positive indicators that a journal or publisher is not predatory: