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Key Features
Instant Calculation
Get accurate results in real time with our optimized algorithm.
Mobile Friendly
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Privacy Focused
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100% Free
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A strong password needs both length and a genuinely random, unpredictable character sequence — something that's hard to guarantee when making one up by hand. This generator creates one or more cryptographically random passwords from a customizable character set and length, along with the resulting entropy.
How it works
Choose a password length, which character types to include (uppercase, lowercase, numbers, symbols), and how many passwords to generate. Each character is drawn independently and uniformly at random from the selected character set using a cryptographically secure random source.
- Enter password length.
- Enter include uppercase letters.
- Enter include lowercase letters.
- Enter include numbers.
- Enter include symbols.
- Enter number of passwords to generate.
- Click Calculate to see your results.
Examples
A 16-character password with all character types
Using all four character types at 16 characters gives roughly 95-105 bits of entropy — well beyond what's practically brute-forceable.
Who should use it
- Generating a strong, unique password for a new online account.
- Creating a batch of random passwords or API keys for testing or provisioning purposes.
Industry applications
- Software development and system administration
- Personal and business account security
Advantages
- Uses a cryptographically secure random source for every character.
- Reports the resulting entropy so you can judge password strength numerically.
Limitations
- Highly random passwords aren't human-memorable — pair with a password manager for practical use.
Common mistakes to avoid
- Reusing the same generated password across multiple accounts — always generate a fresh, unique password for each account.
- Choosing a short length even with all character types included — length matters more than character variety for overall password strength.
Best practices
- Use a password manager to store generated passwords rather than trying to memorize them, since a sufficiently random password isn't meant to be memorable.
Tips
- Check the resulting entropy figure against the Password Entropy Calculator or Password Strength Checker's guidance to understand how strong a given length/character-set combination really is.