Secure Password Generator
Generate strong, cryptographically secure random passwords online for free. Custom length, symbols, numbers, and entropy calculation locally.
Create unbreakable passwords and passphrases using your browser hardware-backed cryptographic random number generator (window.crypto). Calculate Shannon entropy and password crack resistance in real time.
How to use
- Select mode: Random Character Password or Memorable Multi-Word Passphrase.
- Customize parameters (length, uppercase, numbers, symbols, word count, separator).
- Inspect real-time entropy score and estimated crack resistance time.
- Click to copy single or bulk generated passwords to clipboard.
Frequently asked questions
Is the randomness cryptographically secure?
Yes! It relies on the browser standard `crypto.getRandomValues()`, seeded directly by the operating system cryptographic entropy pool.
Why use a Passphrase instead of random characters?
Following the XKCD principle, a sequence of 4-6 random words yields tremendous entropy against brute force while remaining effortless for human memory.