Strong Password Generator & Security Checker

Why use a Random Password Generator?

Humans are terrible at being random. When we create passwords, we tend to use predictable patterns like birthdays, pet names, or sequences like “123456”. Hackers know this and use “Dictionary Attacks” to crack these accounts in seconds.

A Strong Password Generator eliminates this human bias. It creates a chaotic string of characters that is mathematically impossible to guess.

What makes a password secure?

To prevent brute-force attacks, a secure password should meet three criteria:

1. Length: At least 16 characters (12 is the absolute minimum).
2. Complexity: A mix of uppercase, lowercase, numbers, and symbols.
3. Unpredictability: No dictionary words or personal dates.

How our Password Strength Checker works

Most online password checkers are dangerous: they send your password to a server to analyze it. We do not do that.

100% Client-Side Privacy

Our Password Strength Checker runs entirely in your browser using JavaScript. Your password never leaves your device. You can even disconnect your internet and the tool will still work.

Have I Been Pwned? (k-Anonymity)

To check if your password was leaked in a data breach, we use a privacy-preserving technique called k-Anonymity:

1. We hash your password locally (SHA-1).
2. We send only the first 5 characters of that hash to the Have I Been Pwned API.
3. The API returns hundreds of hashes starting with those 5 characters.
4. Your browser compares the rest locally. Result: We (and the API provider) never know your real password.

Tips for better Digital Hygiene

• Use a Password Manager: Don’t try to remember complex passwords. Use a tool like Bitwarden or Proton Pass.
• Enable 2FA: Two-Factor Authentication (like a YubiKey) adds a physical layer of security.
• Different Passwords for every site: If one site gets hacked, your other accounts remain safe.