Use Unique Passwords
Never reuse passwords across different accounts. If one gets compromised, all accounts are at risk.
Free Strong Password Generator
Create secure passwords and passphrases instantly
Private and client‑side. One‑click copy. No sign‑up.
Your privacy is our priority. All credentials are generated securely on your device using the Web Crypto API and are never sent to our servers.
- Private
- Presets
- Bulk
Strength: —
Tip: Store passwords in a trusted password manager. Never reuse passwords.
Strength: —
Combine at least 4–6 words for strong security. Avoid personal info.
Bulk generation respects the options of the currently active Password or Passphrase tab.
How It Works (Privacy‑First)
StrongPass.pro generates passwords entirely in your browser. Nothing is sent to our servers—ever. You can use it online or offline after the page loads.
Privacy by design
- Client‑side only: All generation happens locally using your device’s browser.
- No storage or telemetry: We don’t store, sync, or log generated values. Copy uses your device’s Clipboard API.
- Works offline: If the strength library isn’t available offline, we fall back to a local entropy model.
Security under the hood
- Cryptographic randomness: Characters are chosen using the Web Crypto API (
crypto.getRandomValues()), notMath.random(). - Character pools & rules: You control a–z, A–Z, 0–9, symbols, and options like “Require each type”, “No repeated adjacent chars”, and “No duplicate characters”.
- Prefix & keyword: “Begins with” and “Add keyword” are placed at the edges. We fill the remaining length with random characters.
Strength and crack‑time estimates
- zxcvbn (when available): If Dropbox’s zxcvbn loads, we show its score and time‑to‑crack estimates.
- Entropy fallback: Otherwise we estimate entropy (bits) from the effective character set and random length, and approximate crack time assuming ~10¹⁰ guesses/sec (offline fast hashing).
Notes
- Custom text reduces randomness: A long prefix/keyword reduces the random portion. Keep custom text short and increase overall length for best security.
- Site rules vary: If symbols are restricted, disable them and increase length or use a passphrase.
Password Security Tips
Longer is Stronger
Aim for at least 12–14 characters. Each extra character increases security exponentially.
Change Regularly
Update important passwords every 3–6 months, especially for email, banking, and social media.
Use a Password Manager
Use a reputable password manager to securely store and organize all your passwords.
Explore Our Free Security Tool-belt
Data Breach Checker
Check if your email appears in known data breaches. Private by design.
Username Generator
Create unique usernames with length, keyword, and fun category options.
Password Strength Tester
Analyze your password locally with entropy and crack time estimates.
PIN Generator
Generate secure numeric PINs with length and repeat options.
Security Guides & Articles
How to Create Strong Passwords: Complete 2025 Security Guide
Passwords vs. Passphrases: Which Should You Use in 2025?
A Step-by-Step Guide to Conducting Your Own Personal Security Audit
What is a Diceware Passphrase? The Complete 2025 Security Guide
Understanding 12/24 Word Recovery Phrases: Complete Guide
Password Generator FAQs
Is it safe to use an online password generator?
Yes—when generation happens locally in your browser. StrongPass.pro uses the browser’s Web Crypto API to generate randomness on your device. Passwords are never sent to a server, stored, or logged. You can verify this in the network panel: generation happens offline after the page loads.
How random are the passwords?
We use crypto.getRandomValues(), a cryptographically secure random source provided by your browser. Characters are chosen without bias and shuffled to avoid patterns. This is significantly stronger than math.random() or simple algorithms.
What length should I use?
For passwords, we recommend 16+ characters with a mix of types. For passphrases, use 4–6 random words. When in doubt, favor more length—entropy grows quickly with each additional character or word.
Password vs. passphrase—what’s better?
Both can be strong. Passwords are compact and work everywhere. Passphrases are longer and often easier to remember. Choose based on site rules: when symbols are restricted, a long passphrase is a great alternative.
Do I need symbols for a strong password?
Symbols help, but length matters more. Some sites restrict special characters—use the Presets to match common rules. If symbols aren’t allowed, increase length.
Do you store or see my passwords?
No. Generation is client‑side, and we never transmit or store any generated values. Copying uses the Clipboard API on your device.
Can I generate many passwords at once?
Yes—use the Bulk tab to generate multiple passwords or passphrases and download them as a .txt file.
How do you calculate strength?
We use Dropbox’s zxcvbn when available, and a fallback entropy estimate otherwise. The bar and labels reflect estimated resistance to guessing. Regardless of score, unique passwords per site are essential.