Check if your password has been leaked
Find out if your password or email appeared in known data breaches, and see a detailed password strength analysis. The process is anonymous – your data never leaves the browser in plain form.
Passwords are checked against Have I Been Pwned, while email addresses are checked against the independent XposedOrNot database — two separate breach data sources.
Detailed password analysis
Suggestions for improvement
🧠 This tool uses Have I Been Pwned. Your password is hashed locally (SHA-1), and only a prefix is sent to the API – your password is never revealed.
Detected breaches:
🧠 The email address is checked against the independent, free XposedOrNot database — separate from Have I Been Pwned.
Detailed password analysis
Suggestions for improvement
This mode sends nothing — not even a hashed fragment. Strength analysis (entropy, crack time) is computed entirely in your browser, with no internet connection involved.
Why use Passly?
Security and anonymity
Your password is processed locally. No data ever leaves your device.
Up-to-date leak data
The Have I Been Pwned database contains billions of passwords from confirmed breaches.
Check and protect yourself
If your password is compromised – change it immediately and create a new strong one.
The world’s worst passwords
These passwords have topped the annual "most common" (read: worst) password lists for years. If one of them looks familiar — it’s time for a change.
Based on annual most-common-password reports (e.g. NCSC, NordPass) — the same entries reappear almost every year.
The biggest password breaches in history
A few moments that show how badly password reuse and weak protections can backfire at scale.
RockYou
A SQL injection exposed 32 million accounts — passwords were stored in plain text, with no encryption at all. The dump became the basis for the infamous "rockyou.txt" wordlist, still used for password cracking today.
Data from 165 million accounts was stolen (the full scale was only revealed in 2016) — passwords were protected with weak, unsalted SHA-1 hashing, making them much easier to crack.
Adobe
153 million accounts, including poorly encrypted passwords and password hints stored in plain text.
Yahoo
The largest single breach in history — affecting all roughly 3 billion Yahoo accounts.
Collection #1
A bulk compilation of older leaks (not a fresh hack of one company) — 773 million email addresses and 21 million unique passwords packaged into one file circulating online.
RockYou2024
Another massive compilation (not a new hack) — about 9.9 billion passwords gathered from earlier leaks and databases into a single file.
Figures are estimates based on widely reported industry sources. "Compilation" means a collection of data from earlier, separate breaches — not a fresh hack of a single company.
Why should you check your passwords?
Knowledge is the first step to safety. Learn how data breaches work and how to protect yourself.
How do password leaks happen?
During a breach, user data can be exposed – if you reuse passwords, other accounts are also at risk.
Why is reusing passwords dangerous?
Reusing passwords makes it easier for attackers to access multiple accounts after one breach.
How to protect yourself?
- Use unique passwords for every account.
- Create passwords at least 12 characters long with varied symbols.
- Use a password manager.
- Enable two-factor authentication (2FA).
- Regularly check your passwords on Passly.pl.
What is k-anonymity?
K-anonymity technology allows checking a password without revealing its full hash.
Take care of your online safety – generate strong passwords and check them regularly.
Generate a new password