Top OSINT Tools to Find Emails, Usernames and Passwords

Introduction

In the world of cybersecurity, knowledge is power. One of the most powerful skillsets every ethical hacker, penetration tester, and OSINT researcher must master is the ability to discover digital footprints left behind by individuals and organizations. These footprints often include emails, usernames, leaked credentials, and even associated social media accounts.

Why does this matter? Because in the reconnaissance (recon) phase, the very first step of ethical hacking, understanding what’s publicly exposed is crucial. It helps identify potential security risks early and puts you in a stronger position to prevent misuse.

This guide lists the most useful OSINT tools to help you:

Find emails & usernames
Verify reputation & validity
Discover linked social media accounts
Check leaked credentials
Crack or decrypt hashes

The following table compiles free and premium tools for researchers.

Complete OSINT Tool Collection

Category	Tool / Link	Description
Find Emails	theHarvester	Email/Domain harvesting tool.
	Breach.VIP	Free registration, find emails for a domain.
	Hunter.io	Popular email discovery service.
	Phonebook.cz	Connected with IntelX, good for email lookups.
	VoilaNorbert	Find and verify professional emails.
	Clearbit Connect	Chrome extension for finding contacts.
	Snov.io	Email finder and outreach platform.
	Experte Finder	Bulk email discovery tool.
	EmailFinder	Open-source email searching script.
	Infoga	Email OSINT gathering tool.
	Anymail Finder	Email discovery by domain.
	Minelead.io	Free email finder with API access.
Chrome Extensions	Email Hunter Extension	Best email hunter extension.
	SignalHire	Email & phone discovery extension.
	GetProspect	Email discovery on LinkedIn.
	ContactOut	Find LinkedIn and Gmail contacts.
Email Reputation	EmailRep	Check email risk/reputation scores.
Email Reputation	Gravatar Checker	Find user profile images linked to emails.
Email Verification	EmailHippo	Single/bulk email verification.
	MailTester	Basic free email validity checker.
	IntelX Validator	Email validation using IntelX database.
Email Generator	Email Permutator	Generate multiple variations of an email.
Email Tracking	Email Header Analysis	Guide to analyze email headers with OSINT tools.
Social Media OSINT	WhatsMyName	Find usernames across multiple platforms.
	IDCrawl	Find linked social media profiles.
	Blackbird	Find accounts from email/usernames.
	Sherlock	Popular OSINT tool to find usernames across platforms.
	Holehe	Check if an email is registered on websites.
	Maigret	Enumerate social media profiles by username.
Gmail OSINT	Gmail OSINT Tool	Analyze Gmail headers & accounts.
Leaked Credentials	Have I Been Pwned	Check if your email appears in data breaches.
	Breach Directory	Search leaked credentials.
	DeHashed	Paid but powerful breach search engine.
	Snusbase	Paid database breach search.
	LeakCheck.io	Free basic searches, paid full results.
	IntelX	Search leaks, emails, domains, and more.
Decrypt Hashes	Hashes.com	Online hash decryption service.
Decrypt Hashes	CrackStation	Free hash cracking with large dictionaries.

How These Tools Are Used

1. Email Discovery & Verification

Before launching a phishing campaign simulation or conducting recon on a company, you may need to identify employee email formats (e.g., firstname.lastname@company.com). Tools like Hunter.io, theHarvester, and Phonebook.cz are perfect for this. Once emails are found, use verification tools such as EmailHippo or MailTester to confirm if they’re active.

2. Social Media OSINT

People often reuse usernames across platforms. Tools like Sherlock, WhatsMyName, and Maigret allow you to input a username/email and instantly check for profiles across hundreds of social networks. This is critical for threat intelligence, digital forensics, and personal investigations.

3. Leaked Credentials & Breaches

Services like Have I Been Pwned or DeHashed let you check if an email or password has appeared in data breaches. Cybersecurity teams use this to alert employees and reset compromised credentials. Attackers, however, may use the same leaks for credential stuffing attacks — which is why defenders must always stay ahead.

4. Gmail OSINT & Tracking

Gmail-specific tools analyze headers, metadata, and sender reputation. This helps in phishing investigations and tracking email campaigns. Combined with header analysis guides, it allows you to trace the real sender, even if they used spoofing.

5. Hash Cracking

Sometimes leaked credentials are hashed. Tools like CrackStation and Hashes.com can attempt to reverse these hashes using massive databases. While attackers use these to recover plain text passwords, defenders leverage them in red team exercises to demonstrate risks.

OSINT is not about breaking into systems; it is about using publicly available information to identify security weaknesses before cybercriminals can exploit them. The tools listed here are just a starting point. When combined with creativity and persistence, OSINT becomes one of the most powerful resources in a cybersecurity professional’s toolkit.

Always remember to use these tools ethically and legally. Perform reconnaissance only on targets where you have explicit permission to test. Misuse can lead to serious consequences.

Conclusion

Always remember to use these tools ethically and legally. Perform reconnaissance only on targets where you have explicit permission to test. Misuse can lead to serious consequences.

0xSnow

0xSnow is a cybersecurity researcher with a focus on both offensive and defensive security. Working with ethical hacking, threat detection, Linux tools, and adversary simulation, 0xSnow explores vulnerabilities, attack chains, and mitigation strategies. Passionate about OSINT, malware analysis, and red/blue team tactics, 0xSnow shares detailed research, technical walkthroughs, and security tool insights to support the infosec community.