The journals that'll publish anything for a fee — and the warning signs hiding in plain sight.
What a predatory journal actually is
Academic publishing runs on peer review: independent experts scrutinise a paper before it appears in print. Predatory journals skip that step, or fake it. They charge authors a fee — often structured to look like a legitimate article processing charge — and publish whatever arrives, sometimes within days of submission. The result is a journal-shaped object that lends a veneer of credibility to work that has never been properly checked.
The term was popularised by librarian Jeffrey Beall, who maintained a public watchlist of suspect publishers and journals from around 2010 until he took it down in 2017 under pressure. Copies and successors persist, but no single list is definitive — the landscape shifts constantly as publishers rebrand or launch new titles. Knowing what to look for matters more than finding the right blacklist.
The warning signs
The promise is suspiciously fast. Legitimate peer review takes weeks to months. An acceptance email promising publication in days is a signal that no real review happened.
The scope is implausibly broad. A journal that covers medicine, engineering, social sciences and humanities in a single issue has no coherent readership and no specialist reviewers. Real journals have focus.
The fee request arrives before any review. In genuine author-pays publishing, fees are only requested after a paper clears peer review. If money is mentioned at the point of submission — or in the initial invitation — that order is backwards.
The editorial board is fake or uninformed. Predatory journals routinely list real researchers on their boards without permission. It is worth checking whether named editors actually know they are listed. Blank or fictitious boards are a related red flag.
Contact and publisher details are vague or wrong. A journal published in London with a Gmail address and a stock-photo office front is not what it claims to be. Look for a verifiable physical address and a publisher with a traceable history.
The website is riddled with errors. Typos, broken links, inconsistent formatting and recycled template text are common. Professional publishers maintain their platforms.
Unsolicited invitation emails. Cold emails inviting you to submit to a journal you have never heard of — or, stranger, inviting you to join an editorial board for a field adjacent to yours — are a standard recruitment tactic. Treat them with scepticism.
How to check before you trust or submit
Start with the Directory of Open Access Journals — DOAJ rigorously vets journals that apply for inclusion, making it a reliable positive indicator. Membership is not a guarantee of perfection, but absence is worth noting.
For well-established titles, check whether the journal appears in major indexing databases such as Web of Science or Scopus. Predatory journals rarely survive the scrutiny of professional indexers.
Search the journal's name alongside words like "predatory" or "scam" — researchers talk, and warnings accumulate in online forums, PubMed discussions and blog posts. The Think. Check. Submit. initiative (thinkchecksubmit.org) provides a structured checklist specifically designed for this purpose and is freely available.
For articles you are evaluating rather than submitting to, ask whether the work appears in a trusted repository — arXiv, PubMed Central or Zenodo impose their own quality filters at deposit. A paper hosted only on a predatory journal's own site, with no other trace, deserves extra scrutiny.