Why Use a Secure Random Password Generator?
Weak and reused passwords are the most common way online accounts get compromised. Cybercriminals use dictionary attacks and powerful brute-force software that can test billions of combinations per second, cracking predictable passwords like names, dates or common words in minutes. A secure random password generator solves this by creating long, unpredictable combinations of letters, numbers and symbols that are practically impossible to guess or crack.
This free tool is fast and fully secure: passwords are generated with PHP's cryptographically secure random_int function and are never stored in any database. The built-in strength meter shows you the entropy of every password in bits, along with an estimated crack time, so you always know exactly how strong your new password is before you use it.
Password Length & Brute-Force Cracking Time Benchmark
| Length | Numbers Only | Lowercase Only | Mixed All (Upper+Lower+Digits+Symbols) | Security Level |
|---|---|---|---|---|
| 6 chars | < 1 ms | < 1 sec | 5 secs | Weak |
| 8 chars | < 1 sec | 3 mins | 8 hours | Medium |
| 12 chars | 3 secs | 3 weeks | 34,000 Years | Strong |
| 16 chars | 1 hour | 100,000 Years | 10+ Billion Years | Excellent |
| 20+ chars | 500+ Years | ∞ | ∞ (Uncrackable) | Uncrackable |
Frequently Asked Questions
How long should a secure password be?
Security experts recommend at least 12 to 16 characters. Every extra character multiplies the number of possible combinations, making brute-force attacks dramatically harder. Our generator supports lengths from 8 to 64 characters.
Is this tool safe to use?
Yes. Passwords are generated with PHP's cryptographically secure random_int function and are never stored or sent to any third party. The password checker in the "Check" tab runs 100% locally in your browser, so nothing you type ever leaves your device.
What makes a password strong?
Three things: length, variety, and randomness. Combine uppercase and lowercase letters, numbers and symbols, and avoid personal information or common words. The built-in strength meter shows entropy in bits and an estimated crack time.
Why shouldn't I reuse the same password everywhere?
If one website suffers a data breach, attackers immediately try that password on your other accounts. Using a unique random password for every site limits the damage of a single leak. Use the history panel to keep track of the passwords you generate.
How is password entropy and crack time calculated?
Entropy measures unpredictability in bits using the formula E = L * log2(R), where L is the character length and R is the pool size (94 possible characters for full ASCII). A password with 80+ bits of entropy requires millions of years to crack even against massive supercomputer clusters and distributed GPU rigs.
What is the difference between a password and a passphrase?
A password is a random string of mixed characters (e.g. 9k#P!z7$Wq), ideal for password managers. A passphrase is a sequence of 4 to 8 random dictionary words separated by hyphens or spaces (e.g. correct-horse-battery-staple), making it extremely strong yet effortless for humans to memorize for master accounts.