Check if your password has appeared in known data leaks and should no longer be used. The check is performed securely using the 'Have I Been Pwned' database.
💡Privacy Notice: The entered password is guaranteed not to be transmitted or stored. The input is absolutely safe. After entering, it will show how often the password was found and published in data thefts.
By Torsten Schubert, Monswyk AGLast updated: July 2026
Password leaks and data breaches are security incidents where personal or confidential information – such as passwords, email addresses, or credit card data – falls into the wrong hands, either unintentionally or through criminal attacks.
The scale is documented: the Identity Theft Resource Center counted 3,205 publicly reported data compromises in the US in 2023 alone, affecting more than 350 million people. Have I Been Pwned meanwhile indexes 17.7 billion breached accounts from 1,015 hacked services (as of July 2026). The biggest confirmed leaks in history:
Yahoo (2013-2014): 3 billion accounts
Facebook (2019): 533 million users
LinkedIn (2021): 700 million profiles
Twitter (2022): 200 million email addresses
Adobe (2013): 153 million users
Data leaks don't happen by accident. They are the result of targeted attacks using various methods:
SQL Injection: Poorly programmed websites allow attackers to directly manipulate databases
Phishing: Employees are deceived into revealing access credentials
Malware: Malicious software collects login data from infected devices
Insider Threats: Malicious or negligent employees
Unpatched Vulnerabilities: Known security gaps that are not closed
Cloud Misconfigurations: Misconfigured databases are publicly accessible
A password leak means that user credentials and passwords (usually from a company's database) have been stolen and often published or sold on the internet. Such leaks occur through hacker attacks or poorly secured systems.
Example: An online shop gets hacked, and thousands of customers' login data ends up on the dark web. Criminals can try to use this data to gain access to other accounts – especially if users use the same password multiple times.
A data breach is a more general term for incidents where sensitive information is lost, stolen, or accidentally made public. This can happen through human error, technical failures, or cyber attacks.
Example: An employee accidentally sends an Excel spreadsheet with customer data to the wrong recipient – this is a data breach, even if there's no malicious attack behind it.
Stolen data can be used to impersonate someone else.
Credit card data or access to online accounts can be misused.
Companies affected by data breaches often lose their customers' trust.
Use unique and strong passwords for each online account.
Enable two-factor authentication (2FA) whenever possible.
Regularly check if your data has been compromised – e.g., on https://haveibeenpwned.com.
Change passwords immediately when you learn of a leak.
💡Tip: A password manager helps create and manage secure passwords.
Combine these free tools for end-to-end protection. Everything runs locally or with strict privacy guarantees.
Create strong, unique passwords locally in your browser — Web Crypto API, no tracking.
Open generatorWiFi QR Code GeneratorGenerate a WiFi QR code so guests join your network without typing the password.
Create WiFi QR2FA GuideProtect your accounts with two-factor authentication — TOTP, push, and hardware keys compared.
Learn 2FA