Password Breach Checker

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.

HIBP Database Check Partial Hash Privacy Instant Results Security Recommendations

SECURE

Protected Connection

No breaches found

Found in X breaches

Only first 5 hash chars sent

Trust Score

5.0

Password Breach Checker

Check if your password has been compromised in known data breaches

100% Private: Your password never leaves your device. We use k-anonymity via HaveIBeenPwned API.

Enter your password

We only send the first 5 characters of your password's hash - never your actual password. Learn more

11.7B+

Compromised passwords in database

Data Source

100%

Private - password never sent

How It's Safe

Instant

Real-time breach checking

How It Works

Need a Strong Password?

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.

Customizable Length

Choose 4-128 characters

Multiple Character Sets

Letters, numbers & symbols

Pronounceable Options

Easy to remember

Instant Generation

No waiting required

Generate Secure Password Password Strength Checker

Free & No Registration Required

Quick Password Tips

Use 12+ characters

Mix letters, numbers & symbols

Make each password unique

Don't use personal info

Avoid common patterns

Never share passwords

Password Generator Password Strength Checker

HaveIBeenPwned

Created by Troy Hunt

What is HaveIBeenPwned?

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.

Major Breaches Include:

LinkedIn (164M accounts)
Adobe (153M accounts)
Yahoo (3B accounts)

Facebook (533M accounts)
Dropbox (68M accounts)
And 600+ more...

11.7B+

Pwned Passwords

Password Hashing

Your password is converted to a SHA-1 hash (40 characters) on your device.

Hash Prefix

Only the first 5 characters of the hash are sent to the API.

Range Query

The API returns all hashes starting with those 5 characters (~1000 results).

Local Matching

Your device checks if your full hash matches any in the returned list.

Example

// Your password: "MySecretPassword"

// SHA-1 hash: 3D5B2C7A8F9E1B4D6A2C5E7F8A9B1C3D4E5F6789

// We only send: 3D5B2 (first 5 characters)

// API returns ~1000 hashes starting with 3D5B2

Yahoo (2013-2014)

3 billion accounts compromised

Facebook (2019)

533 million accounts

LinkedIn (2012)

164 million accounts

Adobe (2013)

153 million accounts

Help & Related Tools

Everything you need to know

FAQ Frequently Asked Questions

How does the breach checking work?

The tool uses the Have I Been Pwned API, which contains passwords from known data breaches. It sends only a partial hash of your password (first 5 characters) to protect privacy while checking against millions of compromised passwords.

Is it safe to enter my real password?

Yes, the tool uses k-anonymity - only the first 5 characters of your password hash are sent to the API, never your actual password. This method, designed by security experts, protects your privacy while enabling breach detection.

What should I do if my password appears in breaches?

Change the password immediately on all accounts where you use it. Even if the specific breach is old, compromised passwords are used in automated attacks. Replace it with a unique, strong password that has not been breached.

How often is the breach database updated?

The Have I Been Pwned database is regularly updated with new breach data as it becomes available. Major breaches are typically added within days or weeks of disclosure, keeping the database current and comprehensive.

Does this check work for all types of passwords?

The tool checks against actual passwords that appeared in real data breaches. It is most effective for common passwords, dictionary words, and previously compromised passwords. Truly unique, complex passwords are less likely to appear in breach data.