How to Tell if a Journal is Predatory: 10 Red Flags & Free Checker Tools

Predatory publishing has grown to thousands of fake or low-quality journals charging APCs in exchange for almost no peer review. Once you publish in one, your reputation is hard to repair. This 2026 guide gives a 5-minute verification workflow, 12 red flags grouped by severity, a complete list of fake impact factors to ignore, real publisher case studies, and the free tools that catch predatory behaviour before you submit.

What Is a Predatory Journal?

A predatory journal is a publication that exploits the open access model: it charges Article Processing Charges (APCs) without providing legitimate peer review, editorial oversight, or quality control. The publisher's incentive is volume of fee-paying submissions, not advancement of science.

The phenomenon is not the same as low-quality open access publishing. Mainstream OA publishers (PLOS, eLife, MDPI, Frontiers, BMC) all charge APCs and operate legitimately — though specific titles within them have come under scrutiny. The difference is intent and process, not business model.

Predatory vs Hijacked vs Low-Quality: Know the Difference

• Predatory journal — fake or near-fake journal designed to extract APCs. No real peer review. May lie about indexing and impact factor.
• Hijacked journal — a clone of a legitimate indexed journal. Same title, same ISSN, similar website. Steals submissions from researchers who believe they are submitting to the real journal. See Retraction Watch's Hijacked Journal Checker.
• Low-quality journal — real but weak: light peer review, niche audience, low citation impact. Not fraudulent. Publishing here is suboptimal but not career-damaging.

All three are problems, but the responses differ. Predatory and hijacked journals require active avoidance; low-quality journals are simply a poor strategic choice.

12 Red Flags Grouped by Severity

Critical (do not submit if you see any of these)

1. Promise of acceptance in 24–72 hours. Genuine peer review takes 4–16 weeks minimum. Anything faster is no peer review.
2. Fake impact factor. The journal advertises "Global Impact Factor", "Universal Impact Factor", "SJIF", "ICI (Index Copernicus) Value" as if it were a Clarivate IF. The only real impact factor is the Clarivate Journal Citation Reports IF.
3. Hijacked-clone behaviour. Title and ISSN exactly match a legitimate indexed journal, but the URL is different (e.g. a `.com` or `.org` clone of a `.edu`-hosted real journal).
4. No verifiable editorial board. Listed names are fictitious, generic, or real researchers who confirm they were never invited.

High concern (investigate further before submitting)

5. Unsolicited mass-emailed invitations. Generic flattery, mistakes in your name or field, urgency language ("submit by Friday for 30% discount").
6. Not in Scopus or Web of Science. Verify on scopus.com/sources and mjl.clarivate.com. Legitimate journals in most fields are in at least one.
7. Misleading similar-name to a prestigious journal. "International Journal of Science" mimicking Science. "Journal of Nature" mimicking Nature.
8. Hidden or post-acceptance APC. The fee is not disclosed upfront on the journal's site, or it inflates after the acceptance email arrives.

Moderate concern (one signal alone is not conclusive)

9. Poor website quality. Broken links, grammatical errors, stock-photo editorial portraits, no physical address, contact via Gmail/Hotmail only.
10. No retraction or correction policy. Legitimate journals publish their COPE-aligned policy; predatory ones omit it.
11. No DOI assignment. Most legitimate journals assign Crossref DOIs. Absence is a yellow flag.
12. "Indexed in Google Scholar" as a badge. Google Scholar indexes nearly everything. Citing it as a quality signal indicates bad faith.

The Complete Fake Impact Factor List (Ignore All of These)

None of the following are real impact factors. They are marketing labels invented by metric services with no peer-review oversight:

• Global Impact Factor (GIF)
• Universal Impact Factor (UIF)
• SJIF — Scientific Journal Impact Factor
• SIF — Scientific Indexing Factor
• ICV — Index Copernicus Value (technically a real number, but not an IF and widely abused)
• I2OR Impact Factor
• IIFS — International Impact Factor Services
• GIFS — General Impact Factor Services
• ISI Impact Factor (no longer issued; "ISI" is a deprecated brand)
• OAJI — Open Academic Journals Index
• "Impact Factor (UIF)", "Impact Factor (GIF)" etc. — anything in parentheses indicating a non-Clarivate source.

The only legitimate impact factors:

• JIF — Journal Impact Factor, published by Clarivate in JCR.
• CiteScore — published by Elsevier in Scopus (not the same as IF, but legitimate).
• SJR — published by SCImago using Scopus data (not the same as IF, but legitimate).

5-Minute Verification Workflow

Before submitting to any unfamiliar journal:

1. Search Scopus Sources at scopus.com/sources. Is the journal currently indexed (not "discontinued")?
2. Check Web of Science MJL at mjl.clarivate.com. Confirm WoS coverage and which index (SCIE/SSCI/AHCI/ESCI).
3. Check DOAJ at doaj.org for OA journals — DOAJ has a vetting process predatory journals usually fail.
4. Verify the ISSN at the official ISSN Portal. Confirm the title matches and the publisher matches what the journal's site claims.
5. Google "[journal name] predatory" and "[journal name] retraction". Reading the first page of results catches most known bad actors.
6. Verify three editorial board members on Google Scholar or LinkedIn. Do their affiliations and research areas match? Are they aware they are listed?
7. Check the JournalsHub Indexing Tracker at /indexing-tracker/ for a single side-by-side view of Scopus, DOAJ, JCR, and OpenAlex status.

Five minutes of checking catches well over 95% of predatory journals.

Free Tools to Check Journal Legitimacy

Beall's List in 2026: What's Left of It

Beall's List of potential predatory publishers (created by librarian Jeffrey Beall) was the most-cited blacklist until it was taken down in January 2017 following legal pressure. Mirror sites at beallslist.net still host the frozen 2017 version.

Status in 2026:

• Useful but stale. The 2017 snapshot still catches operators that have stayed in the predatory business.
• Missing post-2017 entrants. Thousands of new predatory journals have appeared since 2017 — Beall's List does not cover them.
• False positives. Some legitimate journals were incorrectly flagged. Beall used heuristics, not systematic vetting.
• Replacement. The modern equivalent is predatoryreports.org, plus Cabells Predatory Reports (institutional).

Use Beall's List as one signal — never as a definitive verdict.

Case Studies: Are MDPI, Frontiers, and Hindawi Predatory?

The short answer: no, they are mainstream publishers — but with specific problems that have been documented at specific titles.

MDPI

Switzerland-based open access publisher. Many MDPI journals hold Q1 / Q2 status in SCImago and JCR. Concerns: high special-issue volume relative to regular issues, fast-track review timelines, occasional self-citation patterns. Evaluate each MDPI title individually — Sensors, Sustainability, IJMS, and Cancers are well-respected; smaller MDPI titles vary.

Frontiers

Switzerland-based OA publisher. Several Frontiers journals are Q1 in their fields (Frontiers in Immunology, Frontiers in Plant Science). Concerns: heavy reliance on author-suggested reviewers, rapid acceptance turnaround, special-issue volume. Several Frontiers journals were delisted from Scopus in 2023 and 2024 but later reinstated after process changes.

Hindawi

UK-based OA publisher acquired by Wiley in 2021. Several Hindawi journals were delisted from Scopus and JCR in 2023–24 after paper-mill activity was documented (coordinated mass submissions of fabricated papers, often from broker networks). Wiley closed many Hindawi titles in 2024. Surviving titles operate under tighter editorial controls but the publisher's reputation took a significant hit.

Lesson: publisher reputation is too coarse a filter. Evaluate the specific journal's current Scopus / JCR status, editorial board, and acceptance behaviour — not the parent publisher's name.

What to Do If You've Already Published in a Predatory Journal

Many researchers — especially early-career and those facing tenure-clock pressure — have published in predatory journals once. It is recoverable.

1. Don't panic. One predatory paper does not end a career, especially with a remediation strategy.
2. Submit the work as a preprint. Upload to arXiv, bioRxiv, SSRN, or your field's preferred preprint server. This creates a citable, indexed version that other researchers can find and cite.
3. Consider re-publication. Some legitimate journals accept previously-published work if the predatory journal is acknowledged. Confirm via pre-submission inquiry.
4. Request retraction. Email the predatory journal's editor requesting retraction. Response rates are poor but the attempt is documented.
5. Be transparent. Note the situation in your CV under a "publications under review" or footnote, rather than hiding it. Hiring committees value honesty.
6. Consult your institution's research integrity office. Most universities have formal guidance for predatory-publication remediation.

Frequently Asked Questions

Is a paid open access journal automatically predatory?

No. Many legitimate, highly-respected journals charge APCs (PLOS, Nature Communications, eLife, Frontiers titles, and most major-publisher OA journals). The distinction is whether the journal provides genuine peer review and editorial oversight — not whether it charges a fee.

Can predatory journals have a real ISSN?

Yes. The ISSN organisation assigns numbers on application without vetting journal quality. A legitimate ISSN confirms the journal exists; it does not confirm legitimacy. Always combine ISSN verification with Scopus / DOAJ / WoS checks.

What is a hijacked journal?

A hijacked journal is a fraudulent clone that mimics a legitimate indexed journal — same name, same ISSN, similar website — to steal submissions and APC fees from researchers who think they are submitting to the real one. Use Retraction Watch's Hijacked Journal Checker before submitting.

What should I do if I already published in a predatory journal?

Submit the same research as a preprint to establish a citable indexed version. Contact your institution's research integrity office. Be transparent in your CV. One predatory publication is recoverable, especially with a remediation plan.

Is Beall's List still useful in 2026?

Partially. The list was frozen in 2017 and misses thousands of newer predatory journals while incorrectly flagging some legitimate ones. Use it as one signal alongside Cabells Predatory Reports, Predatory Reports, DOAJ membership, and current Scopus / WoS status.

Are MDPI, Frontiers, and Hindawi predatory?

No — they are mainstream publishers but have faced criticism over specific issues. Hindawi had multiple journals delisted from Scopus in 2023–24 over paper-mill activity. Frontiers and MDPI have been criticized for special-issue volume and fast-track review. Evaluate each individual title, not the publisher as a whole.

What is a fake impact factor?

Fake impact factors are metrics invented by predatory operators to mimic the real Clarivate JIF — examples include "Global Impact Factor", "Universal Impact Factor", "SJIF", "IF (UIF)", and similar. The only legitimate impact factor is the Clarivate Journal Citation Reports IF.

How quickly should genuine peer review take?

Genuine peer review takes weeks to months. Top-tier journals often take 8–16 weeks for first decision. Any journal promising acceptance in 24–72 hours is performing no real peer review. Even fast-track tracks at legitimate journals take 2–4 weeks minimum.

Can a predatory journal be indexed in Scopus or Web of Science?

Briefly, sometimes. Scopus and WoS run continuous re-evaluation and routinely delist journals that violate ethics. A journal you find in Scopus today may not be there next year. Always check the current source list, not screenshots or outdated PDFs.

What is the safest way to choose a journal?

Cross-check three things: DOAJ membership (for OA) or Scopus + WoS indexing (for paywalled); real editorial board members verifiable on LinkedIn or Google Scholar with matching expertise; transparent peer review and APC policies. The Think. Check. Submit. checklist is the gold standard.

Conclusion

Predatory journals exist because checking them takes effort. Five minutes of cross-referencing Scopus, WoS, DOAJ, ISSN Portal, and a Google search catches almost all of them. The JournalsHub Indexing Tracker and ISSN Checker are designed to compress that five minutes into a single lookup. Build the habit now and you will never have to remediate later.