Best Free Password Generator Online
A good password generator uses a cryptographically secure random source, gives you control over length and character sets, and doesn't send generated passwords to a server.
Top options
| Tool | Randomness source | Privacy | Strength checker | Passphrase support |
|---|---|---|---|---|
| Irreva | Web Crypto API | Browser only | ✅ | ⌠|
| 1Password generator | CSPRNG | Browser only | ✅ | ✅ |
| Bitwarden generator | CSPRNG | Browser only | ✅ | ✅ |
| LastPass generator | Client-side | Cloud account | ✅ | ✅ |
| Random.org | Atmospheric noise | Server-generated | ⌠| ⌠|
What makes a password generator trustworthy
- Uses crypto.getRandomValues() or equivalent — not Math.random() which is not cryptographically secure
- Runs entirely in the browser — generated password never transmitted to a server
- Lets you control length (minimum 16 for secure accounts) and character set
- Optionally checks against common password patterns
Password generator vs password manager
A generator creates passwords. A password manager stores them securely and auto-fills login forms. Use a generator for one-off needs; for ongoing use, pair it with a password manager like Bitwarden (free, open source) or 1Password.
Frequently Asked Questions
Is a browser-generated password secure?
Yes, if it uses Web Crypto API (crypto.getRandomValues). Avoid tools that use Math.random — it's not cryptographically random.
How long should a password be?
16 characters minimum for important accounts. 20+ for financial and email accounts. Length matters more than complexity.
Does Irreva log generated passwords?
No. Generation runs in JavaScript locally; no data is transmitted.