Instantly verify if your email or passwords have been leaked in a historical data breach using the secure Have I Been Pwned database.
Conceptual Logic: This tool implements k-Anonymity to protect your privacy. When checking a password, we generate a SHA-1 hash of your password locally in your browser, then send only the first 5 characters of that hash to the Have I Been Pwned API. The API returns a list of hash suffixes that match those 5 characters, and we check locally if your full hash appears in that list.
Key Assumptions:
Limitations: This tool can only detect breaches that have been publicly disclosed and added to the Have I Been Pwned database. Undisclosed breaches, recent breaches that haven't been processed, or breaches not shared with HIBP won't be detected. The tool is for awareness, not comprehensive security monitoring.
Enter your email address to check for account breaches, or enter a password to check if it has been exposed in known data leaks. You can check both simultaneously.
The tool will display any breaches found, including the source, date, and types of data exposed. Review each breach carefully to understand the impact.
Safe Status: No breaches found for your email or password in the database.
Pwned Status: Your information was found in one or more breaches. Review the specific breaches listed.
Sensitivity Rating:
• Low: Email address only
• Medium: Passwords or personal information
• High: Financial data, social security numbers, or plaintext passwords
A data breach occurs when unauthorized individuals gain access to sensitive, protected, or confidential data. This can happen through hacking, insider threats, poor security practices, or accidental exposure. When organizations fail to properly secure user data, millions of accounts can be compromised in a single incident.
Data breaches have become increasingly common and severe. The Have I Been Pwned database alone contains over 11 billion compromised accounts from more than 600 different breaches. Major incidents like the Collection #1 breach exposed nearly 773 million unique email addresses and 21 million unique passwords.
| Breach | Year | Accounts Affected | Data Types |
|---|---|---|---|
| Yahoo | 2013-2014 | 3 billion | Email, passwords, security questions |
| First American Financial | 2019 | 885 million | Bank accounts, SSNs, mortgage records |
| 2019 | 540 million | User IDs, phone numbers, account details | |
| Marriott | 2018 | 500 million | Passport numbers, credit cards, addresses |
When you check a password, you might wonder: "Am I sending my password to a server?" The answer is no—not the actual password. The tool uses a privacy-preserving technique called k-Anonymity:
This means the API never sees your full password hash, and your actual password never leaves your device.
When a breach occurs, attackers often try the stolen credentials on other websites. If you reuse passwords across multiple accounts, a single breach can compromise all your accounts. This is why using unique passwords for each service is critical.
Cybercriminals compile breached credentials into databases and use automated tools to try these username/password combinations across thousands of websites. This is called a "credential stuffing" attack and is one of the most common methods of account takeover. If your credentials appear in a breach, assume they are being actively used in these attacks.
If your information is found in a breach:
Enter your password in our secure checker. The tool uses k-Anonymity to check against the Have I Been Pwned database without exposing your actual password. If found, it means your password appeared in a known data breach and should be changed immediately on all accounts where you used it.
Yes. When checking email addresses, the tool queries the Have I Been Pwned API, which only returns whether the email appears in known breaches—not the actual breached data. Your email is transmitted securely over HTTPS and is not stored on our servers.
Have I Been Pwned (HIBP) is a free resource created by security researcher Troy Hunt that aggregates data from known breaches. It contains over 11 billion compromised accounts and is widely used by individuals, organizations, and governments to check for credential exposure.
Immediately change your password on the breached service. If you reused that password elsewhere, change it on those accounts too. Enable two-factor authentication wherever possible. Monitor your accounts for suspicious activity and consider using a password manager to prevent future reuse.
No, this tool is for detection, not prevention. It can only tell you if your information has already been exposed. To prevent future compromise, use unique passwords for each account, enable two-factor authentication, keep software updated, and be cautious of phishing attempts.
No. A "safe" result only means your information wasn't found in the Have I Been Pwned database. Your credentials could still be compromised in undiscovered breaches, recent breaches not yet added to the database, or private breaches not shared with HIBP.
We recommend checking your primary email addresses and most important passwords quarterly. You should also check immediately if you hear about a breach affecting a service you use. Consider subscribing to breach notification services for real-time alerts.
You should only check credentials you own or have explicit permission to check. Checking third-party credentials without consent may violate privacy laws and terms of service. This tool is intended for personal security awareness only.
Securely manage and share team credentials with RBAC.
Generate cryptographically secure random passwords.
Calculate the mathematical strength of your passwords.
Identify cryptographic hash algorithms.
Generate memorable and secure passphrases.
Generate TOTP codes for two-factor authentication.