Secure Password Generator
Generate high-entropy random passwords and memorable multi-word passphrases locally using Web Crypto CSPRNG hardware randomness.
Secure Password & Passphrase Generator
CSPRNG Hardware Randomness • Rejection Sampling • Fisher-Yates
How Are These Passwords Generated?
Passwords and passphrases are generated using your browser's cryptographically secure random number generator (CSPRNG), not a predictable pseudo-random source, so the result is suitable for real account security when the length and character set are adequate.
How to Use the Password Generator
- Choose Password mode (random characters) or Passphrase mode (random dictionary words).
- Set the length or word count, and choose which character classes or separators to include.
- Optionally exclude ambiguous characters (like 0/O or l/1) for easier manual entry.
- Generate and copy the result — nothing is sent anywhere or stored.
Technical Notes
- Entropy (measured in bits) reflects how many possible combinations exist, not just length — a longer character set or word list increases entropy faster than length alone.
- A passphrase built from several random dictionary words can have comparable or greater entropy than a shorter random-character password while being easier to type and remember.
- This tool never stores, logs, or transmits generated passwords — closing or refreshing the page discards them, so save what you need before leaving.
Frequently Asked Questions
Are these passwords safe to use for real accounts?+
Yes, when they are long enough. They are drawn from the browser's cryptographically secure random generator using rejection sampling to avoid bias, so the only variable is entropy — pick a length and character set, or word count, that gives a comfortable margin.
Is a passphrase weaker than a random-character password?+
Not necessarily. Strength depends on the size of the pool and the number of independent picks, not on how random it looks. Four or five words chosen at random from a large list can match or beat a shorter character password while being far easier to type.
What does the entropy value in bits mean?+
It is the base-2 logarithm of how many equally likely results the generator could have produced. Each additional bit doubles the effort needed to guess the value by brute force; longer outputs and larger character sets or word lists raise it.