When it comes to evaluating journals and publishers, there is no single criterion that indicates whether or not a publication is reputable. Rather, look for a cumulative effect of more positives or negatives.
You can use the journal evaluation tools below to help you assess the quality of a particular journal or publisher. You may also want to check the lists of trusted open access publishers on the OA Publishers, Repositories, and Directories page or one of the tools listed on the Find a Place to Get Published guide to find high-quality, reputable journals in which to publish.
Journal Evaluation Tools:
Book Publishing Evaluation Tools
If you are still unsure about whether a particular journal or publisher is trustworthy, then please consult the list of criteria below that can help you determine if a journal may have questionable publishing practices you may wish to avoid.
Questionable publishers (sometimes called "predatory" publishers) exploit the Gold model of open access publishing by charging publication fees to authors while simultaneously exploiting their work by offering low-quality publishing services, making false claims, and/or failing to live up to the expectations of a legitimate publisher. It is these latter behaviors that mark a publisher as questionable, not simply the fact that they are open access or charge publication fees. Many legitimate publishers provide open access publication services for a fee (i.e. the Gold model of OA publishing).
Identifying a Questionable Publisher
Here are some warning signs that a publisher may potentially be questionable. If you're still unsure, check out the links above for checklists and other tools to help determine if a publisher is legitimate: