Best free OSINT courses in English 2026
OSINT stands for Open Source Intelligence — techniques for finding and analysing publicly available information online. It is not just for security professionals or investigators. Anyone can use it to check their own digital footprint, verify someone's identity, or understand what personal data is exposed about them online. These are three free OSINT courses in English for 2026.
1. A Beginner's Guide to Managing Criminal IP — Udemy
A short introductory course on Udemy, published by Criminal IP, a cyber threat intelligence search engine. It shows how to use that tool to search for exposed IP addresses, domains and vulnerabilities. It is a tool-focused course, so it works best as a first practical step rather than a full OSINT foundation.
📋 Course details
Platform: Udemy (free Udemy account required)
Level: Beginner-oriented
Language: English
Duration: ~45 minutes (22 lectures)
Price: Free (at the time of writing)
Certificate: Not specified by the provider
Short enough to finish in one sitting. Updated in June 2026. Udemy can change a free course to paid, so check the price before you enrol. Access the Criminal IP course on Udemy →
2. Introduction to OSINT — Security Blue Team
Part of the Blue Team Junior Analyst (BTJA) learning pathway — one of the most recognised free cybersecurity programmes available. This module introduces open source intelligence gathering from a defensive security perspective: how attackers use public data, and how to use the same techniques to protect yourself or your organisation.
📋 Course details
Platform: Security Blue Team (via centri.org)
Level: Beginner
Language: English
Price: Free
Certificate: BTJA certificate of completion after finishing all six courses of the pathway
Particularly useful if you are interested in cybersecurity beyond OSINT. The BTJA pathway covers several related disciplines and is also free. Access the Security Blue Team OSINT course →
3. OSINT for Investigations — Basel Institute on Governance
A free self-paced course developed by the International Centre for Asset Recovery (ICAR). It covers open source intelligence techniques applied to real investigations — from surface web to deep web and dark web sources. At the end, you complete a practical OSINT report on a case study and receive a certificate of completion.
📋 Course details
Platform: Basel LEARN (baselgovernance.org)
Level: Beginner — intermediate
Language: English
Price: Free (registration required)
Certificate: Yes — certificate of completion from ICAR
The most institutionally backed course on this list. Funded by the governments of the UK, Switzerland, Norway and others. Ideal if you want a thorough introduction with a credible certificate. Access the Basel Institute OSINT course →
What can you use OSINT for as a regular user?
OSINT is not only for security teams or law enforcement. These are four practical use cases for anyone:
Discover what information about you is publicly available online — old profiles, phone numbers, photos, addresses — and take steps to remove it.
Check whether a person is who they claim to be on social media, dating apps or online business. Basic OSINT can detect fake profiles in minutes.
Understand how public information about you is collected so you can make more conscious decisions about what you share and where.
Verify claims, identify misinformation and trace the origin of viral images or videos — increasingly essential skills for everyday internet use.
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OSINT Industries: what it is and how to search for information about anyone If you want to go further and remove what you find, read our guide on how to delete your digital footprint from the internet.
Frequently asked questions
Is OSINT legal?
Yes, as long as you use publicly accessible information without breaching systems or violating anyone's privacy. OSINT is based on open sources — social media, public records, search engines. It becomes illegal when you access private information without authorisation or use it for harassment or fraud.
Do I need technical skills to learn OSINT?
No. The courses on this list are designed for complete beginners. Some advanced concepts involve command-line tools, but the fundamentals are accessible to anyone with a computer and an internet connection.
Which course would you recommend to start with?
If you want the most structured introduction with a credible certificate, the Basel Institute course is the strongest option. If you prefer something short to get started quickly, the Criminal IP course on Udemy takes around 45 minutes.
Verdict
Basel Institute for credibility, Criminal IP for a quick start
All three courses are free and in English. For most users, the Basel Institute course is the strongest starting point: institutional backing, a practical case study, and a certificate of completion from a recognised institute.
If you want something shorter first, the Criminal IP course takes under an hour. Keep in mind it teaches one specific tool and does not mention a certificate.
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