Password Generator
Create strong, secure random passwords with customizable length and character types. Includes strength analysis and crack time estimates.
Understanding Password Security
In today's digital world, strong passwords are your first line of defense against cyber threats. A well-generated password can mean the difference between secure accounts and devastating data breaches.
What Makes a Password Strong?
Password strength depends on several key factors:
- Length: The most important factor - longer is exponentially better
- Randomness: Unpredictable character sequences
- Character variety: Mix of uppercase, lowercase, numbers, and symbols
- Uniqueness: Different password for every account
Password Length vs Security
| Length | Character Types | Entropy (bits) | Time to Crack | Recommendation |
|---|---|---|---|---|
| 8 characters | Lowercase only | ~38 bits | Minutes | Very Weak |
| 8 characters | Mixed case + numbers | ~48 bits | Days | Fair |
| 12 characters | Mixed case + numbers + symbols | ~79 bits | Millennia | Good |
| 16 characters | Mixed case + numbers + symbols | ~105 bits | Universal heat death | Very Strong |
Understanding Password Entropy
Entropy measures the unpredictability of your password. It's calculated as:
Entropy = logβ(charset_size^password_length)
Entropy Guidelines
- < 25 bits: Crackable in seconds
- 25-50 bits: Weak, avoid for important accounts
- 50-75 bits: Acceptable for low-risk accounts
- 75-100 bits: Good for most accounts
- > 100 bits: Excellent, suitable for critical accounts
Common Password Mistakes
Avoid these common password vulnerabilities:
- Personal information: Names, birthdays, addresses
- Dictionary words: Even with numbers or symbols added
- Common patterns: "Password123!", "qwerty", "123456"
- Keyboard patterns: "qwertyuiop", "asdfgh"
- Password reuse: Same password across multiple sites
- Simple substitutions: "@" for "a", "3" for "e"
Character Set Impact
Each character type adds to your password's possible combinations:
| Character Type | Count | Examples | Impact |
|---|---|---|---|
| Lowercase letters | 26 | a, b, c... | Base set |
| + Uppercase letters | 52 | A, B, C... | Doubles possibilities |
| + Numbers | 62 | 0, 1, 2... | +19% more combinations |
| + Symbols | 94 | !, @, #... | +52% more combinations |
Password Manager Benefits
Password managers are essential tools for modern security:
- Unique passwords: Different password for every account
- Strong generation: Creates complex passwords automatically
- Secure storage: Encrypted vault with one master password
- Auto-fill: Convenient login without typing
- Breach monitoring: Alerts when passwords are compromised
- Cross-platform sync: Access passwords on all devices
Two-Factor Authentication (2FA)
Even with strong passwords, enable 2FA whenever possible:
- SMS codes: Better than nothing, but not ideal
- Authenticator apps: Google Authenticator, Authy, etc.
- Hardware keys: Most secure option (YubiKey, etc.)
- Backup codes: Keep them safe for account recovery
Password Security Best Practices
- Use a password manager - Essential for unique passwords
- Generate long random passwords - 16+ characters when possible
- Enable 2FA everywhere - Especially for critical accounts
- Use unique passwords - Never reuse across accounts
- Monitor for breaches - Check haveibeenpwned.com regularly
- Update compromised passwords immediately - Don't delay
- Secure your master password - Make it long and memorable
Attack Methods to Defend Against
- Brute force: Trying every possible combination
- Dictionary attacks: Common words and variations
- Rainbow tables: Precomputed hash lookups
- Social engineering: Tricking you into revealing passwords
- Data breaches: Stolen password databases
- Keyloggers: Recording your keystrokes
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Aggiornato Febbraio 2026 Β· Testati e verificati
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π Link affiliato Amazon β supporti CalcFast senza costi aggiuntivi
Frequently Asked Questions
How long should my password be?
At least 12 characters for good security, 16-20 for sensitive accounts. Each additional character dramatically increases security.
What makes a password strong?
Length, randomness, and character variety. Avoid personal information, dictionary words, and common patterns.
Should I use symbols in passwords?
Yes, symbols increase entropy and security. However, length is generally more important than complexity.
What does password entropy mean?
Entropy measures password randomness. Higher entropy = stronger security. It's based on password length and character set size.
Are password generators safe?
Yes, reputable generators are safe. This one runs locally in your browser and doesn't store or transmit passwords.
Should I exclude ambiguous characters?
Excluding 0, O, l, I, 1 prevents typing confusion with minimal security impact, especially useful for shared accounts.
How often should I change passwords?
Change immediately if there's a breach. Otherwise, strong unique passwords don't need regular changing unless required by policy.
Can I reuse passwords?
Never reuse passwords. Each account needs a unique password. Use a password manager to handle this automatically.
What is a password manager?
A tool that securely stores and generates passwords for all accounts. You only need to remember one master password.
How long to crack my password?
Estimates assume brute-force attacks. Real attacks often try common patterns first. Strong, unique passwords remain the best defense.
Should I write down passwords?
Physical notes can be secure if properly stored, but digital password managers are more convenient and secure.
Are passphrases better than passwords?
Long passphrases can be secure and memorable, but randomly generated passwords are typically stronger for the same length.