Password Generator
Generate strong, random passwords instantly in your browser. Cryptographically secure — no data sent to servers.
What Is a Password Generator?
A password generator is an online tool that automatically creates random, secure passwords using cryptographic algorithms. Instead of choosing passwords yourself — which tend to follow predictable patterns like capital first letters and digits at the end — a random password generator uses a cryptographically secure random number generator (CSPRNG) to produce passwords that are virtually impossible to guess or brute-force.
This free online password generator runs entirely in your browser. No data is sent to any server — your passwords are created locally using the Web Crypto API, the same cryptographic foundation used by banks and security software. No ads, no tracking, no account required.
How to Use This Password Generator
- Set your desired password length using the slider or type a number (8–128 characters). For most accounts, 16+ characters is recommended.
- Choose character types — toggle uppercase (A-Z), lowercase (a-z), digits (0-9), and symbols (!@#$) on or off. All four are enabled by default for maximum strength.
- Enable "Exclude ambiguous" if you need to type the password manually (e.g., WiFi passwords). This removes visually similar characters like I, l, 1, O, and 0.
- Generate multiple passwords by moving the "Passwords" slider above 1 — you can create up to 50 secure passwords at once.
- Copy your password with one click. Use the "Copy" button next to any password, or "Copy All" to grab the entire batch.
How Our Password Generator Works
This tool generates passwords entirely in your browser using the Web Crypto API — the same cryptographic foundation used by banks and security software. When you click "Regenerate," your browser calls crypto.getRandomValues(), which draws random bytes from your operating system's entropy pool.
To ensure perfect uniformity, we use rejection sampling: if a random byte would create even a slight statistical bias toward certain characters, it's discarded and a new byte is generated. This eliminates the "modulo bias" problem found in naive implementations.
Every generated password is guaranteed to contain at least one character from each enabled character set (uppercase, lowercase, digits, symbols). The replacement position is chosen randomly — never at the start or end — to avoid predictable patterns.
Why Strong Passwords Matter
Over 80% of data breaches involve weak or reused passwords. Modern attackers use GPU-accelerated brute-force tools capable of testing billions of password combinations per second. A simple 8-character lowercase password can be cracked in under a minute.
The math is straightforward: password strength is measured in entropy (bits of randomness). Each additional character multiplies the number of possible combinations. A 16-character password with all character types has over 100 bits of entropy — meaning even 10 billion guesses per second would take billions of years to crack.
Using a unique, randomly generated password for every account is the single most effective step you can take to protect your online security.
What Makes a Password Strong?
Length over complexity
A 20-character lowercase password (94 bits) is stronger than an 8-character password with all character types (52 bits). Length is the most important factor.
Randomness is key
Human-chosen passwords follow predictable patterns (capital first letter, digits at the end). True randomness from a CSPRNG eliminates these weaknesses.
Larger character sets help
Using uppercase, lowercase, digits, and symbols expands the charset from 26 to 92 characters, tripling the entropy per character.
Never reuse passwords
If one service is breached, attackers try that password on every other service. Unique passwords limit the blast radius of any single breach.
Password Strength by Length
The table below shows how password length and character set affect security. Crack times assume offline brute-force at 10 billion attempts per second against a slow hash (bcrypt/Argon2).
| Length | Character Set | Entropy | Crack Time | Strength |
|---|---|---|---|---|
| 8 | Digits only (10) | 27 bits | ~1 second | Weak |
| 8 | All sets (92) | 52 bits | ~14 hours | Fair |
| 12 | All sets (92) | 78 bits | ~9,581 millennia | Strong |
| 16 | All sets (92) | 104 bits | Centuries+ | Very Strong |
| 20 | All sets (92) | 131 bits | Centuries+ | Maximum |
| 20 | Lowercase (26) | 94 bits | Centuries+ | Very Strong |
The last row demonstrates that a long lowercase-only password can be stronger than a short complex one — length matters more than character variety.
Who Is This For?
Everyday users
Creating accounts for email, social media, shopping, and banking. Generate a unique, strong password for every service — then store it in a password manager.
Developers & engineers
Generating API keys, database passwords, encryption secrets, and JWT signing keys. Use batch mode to create multiple credentials at once. For encoding secrets, try our Base64 encoder.
System administrators
Provisioning server access, WiFi passwords, and service accounts. Enable "Exclude ambiguous" for passwords that need to be typed manually.
Security-conscious teams
Onboarding employees, creating shared credentials, and enforcing password policies. Unlike server-based generators, passwords never leave the browser — no risk of interception.
Tips for Managing Passwords
- Use a password manager — tools like 1Password, Bitwarden, or KeePass store and autofill unique passwords for every account.
- Enable two-factor authentication (2FA) — even if a password is compromised, 2FA adds a second layer of protection.
- Never share passwords via email, chat, or text. Use your password manager's secure sharing feature instead.
- Update passwords for critical accounts (email, banking) at least once a year, and immediately after any breach notification.
- Check for breaches — services like Have I Been Pwned let you check if your email has appeared in known data breaches.
- Follow NIST guidelines — the National Institute of Standards and Technology (NIST SP 800-63B) recommends passwords of at least 8 characters with no maximum length restriction, prioritizing length over complexity requirements.
Frequently Asked Questions
Is this password generator safe? ▾
Yes. Passwords are generated entirely in your browser using the Web Crypto API (crypto.getRandomValues), a cryptographically secure random number generator. No passwords are sent to any server, stored anywhere, or logged.
Are the passwords truly random? ▾
Yes. We use crypto.getRandomValues() — a CSPRNG seeded by your OS entropy pool. We also apply rejection sampling to eliminate modulo bias, ensuring perfectly uniform character distribution.
Can you see my generated passwords? ▾
No. Generation happens 100% client-side. Zero network requests are made with your passwords. They exist only in your browser's memory and vanish when you close the tab.
How long should my password be? ▾
At least 16 characters for most accounts. A 16-character password with all character sets has over 100 bits of entropy, requiring billions of years to brute-force with modern hardware.
Should I include symbols? ▾
Yes, when possible. Symbols increase the charset from 62 to 92, boosting entropy significantly. But length matters more — a 20-character lowercase password is stronger than an 8-character password with all character types.
What does "exclude ambiguous" mean? ▾
It removes visually similar characters: uppercase I, lowercase l, digit 1, uppercase O, and digit 0. Useful when you need to type the password manually (WiFi, servers).
Can I generate multiple passwords at once? ▾
Yes — use the "Passwords" slider to generate up to 50 at once. Each is independently generated. Copy individual passwords or all at once.
Why not use Math.random()? ▾
Math.random() is not cryptographically secure. It uses a predictable algorithm (typically xorshift128+) that can be reverse-engineered. crypto.getRandomValues() draws from the OS entropy pool and is designed for security-sensitive applications.
What is a good password? ▾
A good password is at least 16 characters long, uses a mix of uppercase letters, lowercase letters, digits, and symbols, and is unique to each account. Most importantly, it should be randomly generated — not based on personal information, dictionary words, or predictable patterns.
How often should I change my password? ▾
NIST no longer recommends routine password rotation. Change your password immediately after a confirmed breach, if you suspect unauthorized access, or if you've shared it accidentally. With a unique, strong, randomly generated password and 2FA enabled, frequent changes are unnecessary and can actually reduce security by encouraging weaker choices.
Is a 12 character password strong enough? ▾
A 12-character password with all character types (uppercase, lowercase, digits, symbols) has about 78 bits of entropy — rated "Strong." This would take thousands of millennia to crack with current hardware. However, 16+ characters is recommended for critical accounts like email, banking, and password manager vaults, as it provides over 100 bits of entropy.
Should I use a password manager? ▾
Yes. A password manager (1Password, Bitwarden, KeePass) stores unique, strong passwords for every account and autofills them securely. You only need to remember one master password. This tool pairs perfectly with a password manager — generate a strong random password here, then save it in your manager.