Next Generation Password Strength & Leak Checker

Verify your password strength against 14.5 billion+ hacked accounts and discover how long it would take a supercomputer to brute-force attack your password.

Password Strength Validator

Password Properties Analysis

  • Overall Strength
  • Characters
  • Upper Case Letters
  • Lower Case Letters
  • Numeric Digits
  • Special Symbols
  • Punctuation Marks

Brute-Force Attack Resistance

  • Time required to crack your credentials with different computers:

  • Standard Desktop Computer

  • High-Performance Gaming PC

  • GPU Cluster Attack

  • Supercomputer Infrastructure

Password Leak Checker Against 14.5 Billion+ Breached Accounts

Your password strength means nothing if it's already been exposed in known data breaches. Our leak checker compares your password against massive breach databases to confirm whether hackers already have it.

How it works: We use secure cryptographic hashing to check your password against known breaches without ever transmitting your actual password to our servers. This follows the same privacy-first approach used by industry-leading password managers.
Safe Passwords

Passwords never found in known data breaches. You can confidently use these for high-value accounts.

Compromised Passwords

Found in breach databases. Stop using immediately and change all accounts using this password.

Your Encrypted Saved Passwords

No. Password Copy Leaked? Strength Details Saved On Delete

Understanding Your Password's True Strength

A strong password is your first line of defense against cyber attacks, data theft, and account compromise. But how do you really know if your password is strong enough?

Most people rely on password managers that show a simple "strong" or "weak" indicator, but these tools rarely explain the real story. They don't account for whether your password has been exposed in known breaches, how quickly modern computers could crack it, or subtle vulnerabilities that make seemingly complex passwords surprisingly easy to break.

That's where a comprehensive password strength checker comes in. Unlike basic validators, our next-generation password strength tester analyzes your password against multiple dimensions: character complexity, length, pattern recognition, breach databases, and computational crack time estimates.

Important: All password analysis happens entirely in your browser. We never store, transmit, or log any passwords you check. Your security information stays completely private.

Understanding Password Strength Metrics

What Makes a Password Strong?

Password strength depends on multiple factors working together. A truly secure password balances length, complexity, and unpredictability while remaining memorable enough to use consistently.

Strong Password Characteristics

  • At least 12-16 characters long
  • Mix of uppercase and lowercase letters
  • Includes numbers scattered throughout
  • Contains special symbols (!@#$%^&*)
  • No dictionary words or personal information
  • Unique to each online account
  • Never found in known breach databases

Weak Password Problems

  • Less than 8 characters
  • Only lowercase or only uppercase letters
  • No special characters or numbers
  • Based on dictionary words
  • Contains personal information (names, dates)
  • Reused across multiple accounts
  • Found in previous data breaches

Password Strength Levels Explained

Strength Level Characteristics Recommendation
Very Weak Fewer than 8 characters, simple patterns, common words Do not use
Weak 8-10 characters, limited character types, some patterns Avoid important accounts
Fair 10-14 characters, mixed case, numbers or symbols Acceptable for basic accounts
Strong 14-16+ characters, uppercase, lowercase, numbers, symbols Recommended for most uses
Very Strong 16+ characters, high complexity, unique, never breached Perfect for critical accounts

Password Security Best Practices

Creating Secure Passwords

Never use personal information like birthdates, anniversaries, or names of family members. Hackers attempt these patterns first. Instead, create passwords based on memorable phrases combined with random numbers and symbols—like the first letters of a song lyric, mixed with special characters.

Example: "MyDogAte3PizzasOn@Thursday!" derives from a phrase but includes numbers and symbols.

Managing Multiple Passwords

Reusing passwords across accounts is one of the most dangerous security mistakes. When one site experiences a breach, hackers immediately try your credentials on banking, email, and social media accounts. Using this password strength checker with our local storage feature keeps encrypted copies of unique passwords for each account.

Checking for Breaches

Even strong passwords aren't safe if they've been exposed in data breaches. Our built-in leak checker searches 14.5 billion+ compromised accounts to confirm whether your password has already been stolen. If it has, change it immediately on all accounts where it's used.

Two-Factor Authentication

Even the strongest password is vulnerable to phishing and data breaches. Enable two-factor authentication (2FA) on every account that supports it—whether SMS codes, authenticator apps, or hardware keys. This adds a critical second layer of protection beyond passwords alone.

Regular Password Changes

Security experts recommend updating critical passwords (email, banking, password managers) every 3-6 months. More frequent changes (monthly or quarterly) add extra protection for high-value accounts like financial services or cryptocurrency wallets.

Browser and Device Security

Strong passwords lose their power if your device is compromised by malware. Keep your operating system, browser, and antivirus software updated. Use password managers that encrypt data locally and never store your master password anywhere except in your memory.

Password Strength and Security FAQ

Yes, absolutely. Our password strength checker runs entirely in your browser using client-side JavaScript processing. Your password is analyzed locally on your device without ever being transmitted to our servers. Even our development team cannot see or access the passwords you check. This zero-knowledge architecture ensures complete privacy during password analysis.

The breach checker uses secure cryptographic hashing, specifically the SHA-1 algorithm followed by range queries. Your password is converted into a hash (a mathematical fingerprint), and we check only the first few characters of that hash against our breach database. This method, called k-anonymity, ensures your actual password never reaches our servers while still confirming whether it's been compromised. It's the same privacy-preserving technique used by industry leaders like Have I Been Pwned.

Our estimates are based on current computational capabilities and realistic attack scenarios. For a standard desktop computer, we calculate attempts per second at approximately 1 billion (1 GHz). Gaming PCs with modern GPUs reach 100+ billion attempts per second, and supercomputers can process trillions of attempts. These are conservative estimates—real attackers with distributed networks or custom hardware might work faster. The time estimates assume a purely random password; human-created passwords with patterns crack significantly faster, which is why our checker analyzes for common patterns.

If your password is found in a breach database, take immediate action: First, generate a new strong password using our password generator tool. Second, change the password on the account where you used this compromised password. Third, change it on any other accounts where you may have reused it. Finally, monitor those accounts for suspicious activity over the following weeks. Consider setting up fraud alerts with your bank or credit bureau if the breached account had financial information. Importantly, the presence of your password in a breach database doesn't guarantee your account has been accessed—it means the password exists in stolen data and should be changed as a precaution.

Modern password best practices recommend minimum 12 characters for standard accounts and 16+ characters for high-value targets (email, banking, cryptocurrency). Length is exponentially more important than complexity—a 16-character password with only lowercase letters is harder to crack than an 8-character password with mixed case, numbers, and symbols. For maximum security with memorable passwords, consider passphrases using multiple unrelated words (like "correct horse battery staple"), which are both easy to remember and extremely difficult to crack.

Our local password storage is encrypted with AES-256 bit encryption directly in your browser storage—not on our servers. It's useful for testing multiple passwords or keeping temporary encrypted records during the password recovery process. However, for long-term password management, we recommend using dedicated password managers like Bitwarden, 1Password, or KeePass. These tools are specifically designed for secure password storage with additional features like auto-fill, cross-device sync, and security breach alerts. Never reuse the same password across multiple accounts, regardless of where you store them.

In theory, no—stronger passwords are always better from a security standpoint. However, practically speaking, extremely long random passwords (25+ characters) that you can't remember are less useful than shorter memorable passwords because you'll likely write them down (defeating the security). This is why password managers are essential—they enable you to use extremely strong, unique passwords for every account without memorization. If you're manually typing passwords, aim for 14-16 characters that balance strength with usability. For critical accounts managed by password managers, 20+ character passwords provide exceptional security.

Test passwords whenever you create new ones or make changes. Additionally, periodically check existing passwords (monthly or quarterly) to ensure they maintain strength—especially if you've learned your password habits may be weaker than you thought. After major data breaches affecting multiple platforms, test your passwords again to verify they haven't appeared in new breach databases. The password strength checker is always available at no cost, so there's no harm in regular testing to maintain security awareness.

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