Check if your password has appeared in known data breaches using the secure Have I Been Pwned database with privacy-focused partial hash transmission. This security tool provides instant breach status results and recommendations for compromised passwords without exposing your actual password data. Essential for cybersecurity audits, password policy compliance, personal security assessment, and protection against credential stuffing attacks and data breaches.
Check if your password has been compromised in known data breaches
Compromised passwords in database
Private - password never sent
Real-time breach checking
Don't risk using weak or compromised passwords. Our advanced password generator creates cryptographically secure passwords that are impossible to guess and have never appeared in data breaches.
Free & No Registration Required
Created by Troy Hunt
HaveIBeenPwned is a free service created by security expert Troy Hunt that aggregates data breaches and makes them searchable. It contains over 11.7 billion compromised passwords from hundreds of data breaches.
Your password is converted to a SHA-1 hash (40 characters) on your device.
Only the first 5 characters of the hash are sent to the API.
The API returns all hashes starting with those 5 characters (~1000 results).
Your device checks if your full hash matches any in the returned list.
With 5 characters of a SHA-1 hash, there are 16^5 = 1,048,576 possible prefixes.
This means the API can't determine which specific password you're checking - it's mathematically impossible!
Type your password into the secure form field.
Your browser converts the password to a SHA-1 hash (a 40-character fingerprint).
Only the first 5 characters are extracted and sent to the API.
We query HaveIBeenPwned API for all hashes starting with "3D5B2".
Your device checks if your full hash appears in the returned list (~1000 hashes).
You get instant feedback about whether your password was found in breaches.
Your password appears in one or more of these major data breaches. Here are some of the largest breaches in the database:
3 billion accounts compromised
533 million accounts
164 million accounts
153 million accounts
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