Password Generator
Generate strong, secure passwords instantly locally in your browser
Frequently Asked Questions
i, l, 1, L, o, 0, O. Excluding them makes passwords easier to read and type manually, especially when sharing passwords verbally or writing them down temporarily.
Complete Guide to Strong Password Generation
Why You Need a Secure Password Generator
In today's digital landscape, a strong password generator is your first line of defense against cyber threats. Weak or reused passwords are responsible for a staggering 81% of data breaches, according to security research. Hackers use sophisticated automated tools that can guess simple passwords in seconds, or check billions of leaked credentials against other websites (a technique called "credential stuffing").
Our free secure password generator solves this problem by creating complex, unpredictable passwords derived from cryptographically secure randomness. Unlike passwords created by humans—which often contain predictable patterns like names, birthdates, or keyboard sequences (like "123456" or "qwerty")—generated passwords have high entropy, making them mathematically resilient against brute-force attacks.
How Our Random Password Generator Works
The security of a random password generator depends entirely on the source of its randomness. Many simple generators use the browser's Math.random() function, which is not cryptographically secure and can be predicted by attackers who analyze the output.
Our tool uses the Web Cryptography API (window.crypto.getRandomValues), which taps into your operating system's entropy pool (noise from hardware drivers, keystrokes, etc.). This ensures that every character selected for your password is truly random and statistically unpredictable. Every password is generated securely on your local device—it is never sent over the internet or stored on our servers.
Anatomy of a Strong Password
To maximize password security, a password must have two key qualities: Length and Complexity.
Length is King: Length is the most critical factor. Every additional character exponentially increases the number of possible combinations.
- 8 characters: Can be cracked instantly by modern hardware.
- 12 characters: Offers decent protection for non-critical accounts.
- 16+ characters: The gold standard for banking, email, and password managers. Virtually impossible to crack with current technology.
Complexity Add Depth: A good password utilizes the full range of available characters:
- Uppercase (A-Z) & Lowercase (a-z): Increases the pool to 52 characters.
- Numbers (0-9): Adds 10 more possibilities.
- Symbols (!@#$%): Adds 30+ non-alphanumeric characters, significantly boosting entropy.
For example, a 12-character password using only lowercase letters has about 95 quadrillion combinations. Adding uppercase, numbers, and symbols raises this to over 475 sextillion combinations—making it millions of times harder to crack.
Password Security Best Practices
Using a password generator is just one step. Follow these industry-standard best practices to secure your digital life:
- Never Reuse Passwords: This is the #1 security rule. If you use the same password for Email and Netflix, and Netflix gets breached, hackers will immediately access your Email. Every account needs a unique password.
- Use a Password Manager: It is impossible for a human to remember dozens of unique, 16-character random passwords. Use a trusted password manager (like Bitwarden, 1Password, or LastPass) to store them securely. You only need to remember one strong "Master Password."
- Enable Two-Factor Authentication (2FA): Even the strongest password can be phished. 2FA acts as a safety net, requiring a second code from your phone or security key to log in.
- Check for Leaks: Regularly check resources like "Have I Been Pwned" to see if your email or passwords have appeared in data breaches.
- Avoid "Ambiguous" Characters: When you must type a password manually (e.g., WiFi passwords), avoid characters like 0 (zero) and O (letter O), or 1 (one) and l (lowercase L). Our tool has a feature to exclude these automatically.
Common Password Mistakes to Avoid
Even when trying to be secure, many people make dangerous mistakes:
The "Pattern" Mistake: keying "P@ssw0rd1!" looks complex, but hackers know these substitution patterns (matches like @ for a, 0 for o). It acts like a simple dictionary word to cracking software.
The "Incrementing" Mistake: When forced to change a password, changing "MySecretPass1" to "MySecretPass2" is predictable and insecure.
The "Context" Mistake: Using "Facebook123" for your Facebook account makes it trivial to guess.
Understanding Password Entropy
Security professionals use "entropy" (measured in bits) to quantify password strength. It represents the difficulty of guessing a password.
- < 40 bits: Very Weak (Crackable instantly)
- 40-60 bits: Weak (Crackable in minutes/hours)
- 60-80 bits: Moderate (Safe for low-value accounts)
- 80-100 bits: Strong (Safe for most uses)
- > 100 bits: Very Strong (Future-proof)
A 16-character random password generated by our tool (using all character sets) has roughly 105 bits of entropy, making it extremely secure against all known attack methods.
How to Use This Password Generator
- Adjust Length: Slide to 16 or more for high security.
- Select Characters: Keep Uppercase, Lowercase, Numbers, and Symbols checked for maximum strength.
- Generate: Click "Generate New" to create immediate, cryptographically strong candidates.
- Copy: Click the copy button to save it to your clipboard.
- Exclude (Optional): Check "Exclude Ambiguous" if you need to read the password over the phone or type it manually frequently.