Passphrase Password Generator — Strong, Memorable & Free

Strong Password Generator

Password Generator creates truly random passwords using your device’s cryptographic random number generator — the same quality of randomness operating systems use for encryption keys. Looking for a quick passgen? This free password generator creates strong, random passwords instantly.

Weak, reused passwords cause most account hacks. Generate a unique 16+ character password for every account, store them in a password manager, and your accounts become practically uncrackable.

How to use the strong password generator

1. Set the length with the slider (16+ recommended).
2. Choose character types: uppercase, lowercase, digits and symbols.
3. Click “Generate” — check the strength meter for an entropy estimate.
4. Copy the password into your password manager or signup form.

Key features

• Cryptographically secure: uses crypto.getRandomValues(), not Math.random().
• Live strength meter: shows estimated entropy in bits for each password.
• Fully customizable: length 4–64, toggle each character set.
• Zero-knowledge: passwords are generated locally and never transmitted or stored.

Frequently asked questions

Are these passwords truly random?

Yes — they use the Web Crypto API (crypto.getRandomValues), which draws from the operating system’s secure entropy pool. This is far stronger than Math.random().

How long should my password be?

At least 16 characters with all character types enabled. Every extra character multiplies the guessing difficulty enormously.

Do you save the passwords I generate?

Absolutely not. Generation happens in your browser’s memory; nothing is sent to any server or stored anywhere.

What is the “bits of entropy” number?

It measures password strength: 80+ bits is strong, 100+ is excellent. A 16-character password with all sets enabled has about 105 bits.

What is a passphrase?

A password made of several random words. It’s long (which makes it strong) but readable (which makes it memorable).

Are passphrases safer than traditional passwords?

A 5-word random passphrase has more combinations than most 12-character passwords, and you’re far less likely to reuse it because you can actually remember it.

Is my generated password sent anywhere?

No. Everything is generated with your browser’s cryptographic random number generator. Nothing leaves your device.

Pro Tips

• Use 16+ characters for important accounts — length beats complexity for resisting brute force.
• Enable all character types (upper, lower, digits, symbols) for maximum entropy.
• One password per site: generate a unique password for every account and store them in a password manager — never reuse.

More FAQs

How should I store generated passwords?

In a reputable password manager (Bitwarden, 1Password, etc.). Never in plain-text notes or spreadsheets.

Are longer passwords really safer?

Dramatically. Each extra character multiplies cracking time — a 16-character random password is effectively uncrackable by brute force.

How It Works: Under the Hood

Password strength is pure math: entropy = L × log₂(N) bits, where L is length and N is the pool size. A 12-character password from 94 printable ASCII characters has 12 × 6.55 ≈ 79 bits of entropy — meaning an attacker must try ~2⁷⁹ combinations on average. The critical part is how those characters are chosen: this tool uses your browser’s CSPRNG (crypto.getRandomValues()), which draws from the operating system’s entropy pool (hardware noise, timing jitter). That’s fundamentally different from Math.random(), which is a predictable PRNG — fine for games, catastrophic for secrets.

Each character is selected with modulo-bias elimination (rejection sampling): if the random value doesn’t map evenly onto the pool, it’s discarded and redrawn, so every character is equally likely. No “favorite” characters, no patterns.

Real-World Use Cases

• New account setup: generating a unique 20-character password for every signup — email, banking, social — so one breach never cascades.
• Wi-Fi credential rotation: offices and Airbnb hosts regenerate guest-network passwords monthly; a 16-character alphanumeric is typable yet strong.
• Database credentials: DevOps engineers generate 32-character secrets for production database users, where the password is copied once into a vault and never typed.
• Parental controls: parents set a strong router-admin password kids can’t guess, while keeping the Wi-Fi password itself memorable.
• Recovery codes: generating high-entropy backup codes for 2FA recovery sheets stored in a safe.

Advanced Tips

• Prioritize length over character variety. A 20-character lowercase password (94 bits) beats a 10-character “complex” one (66 bits) — and it’s easier to type. When a site allows long passwords, max out length first.
• Use passphrases where typing matters. Four random words (~50 bits) plus a digit is memorable and strong enough for Wi-Fi. Save the 20-character random strings for password-manager vaults.
• Generate the maximum, then truncate wisely. If a site caps at 16 characters, generate 32 and take the first 16 — still uniformly random, unlike hand-picking.
• Rotate strategically, not constantly. Forced 90-day rotation causes weaker passwords (people just increment a digit). Rotate on suspicion of breach, and use unique-per-site passwords always.

Common Mistakes to Avoid

• Reusing one “strong” password everywhere. A 30-character masterpiece reused on 40 sites is one breach away from total compromise. Uniqueness matters more than strength.
• Trusting “complexity rules” over entropy. P@ssw0rd! satisfies every corporate policy and falls in seconds to dictionary attacks. Randomness beats rules.
• Saving passwords in the browser without a master password. Browser-stored passwords are convenient but extractable by malware. Use a dedicated manager with a strong master password.
• Emailing or messaging passwords. Even a perfect password is compromised the moment it transits an insecure channel. Use a secure share feature or say it in person.

What Is a Passphrase?

A passphrase is a password made of random words — like correct-horse-battery-staple — instead of gibberish characters. Because each word adds a huge amount of entropy, a 4–5 word passphrase can be stronger than a short complex password and far easier to remember and type.

Passphrases vs Random Passwords

Use a passphrase for accounts where you type the password yourself (laptops, WiFi, master passwords). Use a fully random string — which this password generator also creates — for accounts managed by a password manager. Either way, generation happens locally in your browser; nothing is ever sent or stored.

Strong Password Generator

Password Generator creates truly random passwords using your device’s cryptographic random number generator — the same quality of randomness operating systems use for encryption keys.

Password Generator creates truly random passwords using your device’s cryptographic random number generator — the same quality of randomness operating systems use for encryption keys.

Weak, reused passwords cause most account hacks. Generate a unique 16+ character password for every account, store them in a password manager, and your accounts become practically uncrackable.

Weak, reused passwords cause most account hacks. Generate a unique 16+ character password for every account, store them in a password manager, and your accounts become practically uncrackable.

How to use the strong password generator

1. Set the length with the slider (16+ recommended).
2. Choose character types: uppercase, lowercase, digits and symbols.
3. Choose character types: uppercase, lowercase, digits and symbols.
4. Click “Generate” — check the strength meter for an entropy estimate.
5. Click “Generate” — check the strength meter for an entropy estimate.
6. Copy the password into your password manager or signup form.

Key features

• Cryptographically secure: uses crypto.getRandomValues(), not Math.random().
• Cryptographically secure: uses crypto.getRandomValues(), not Math.random().
• Live strength meter: shows estimated entropy in bits for each password.
• Live strength meter: shows estimated entropy in bits for each password.
• Fully customizable: length 4–64, toggle each character set.
• Zero-knowledge: passwords are generated locally and never transmitted or stored.
• Zero-knowledge: passwords are generated locally and never transmitted or stored.

Frequently asked questions

Are these passwords truly random?

Yes — they use the Web Crypto API (crypto.getRandomValues), which draws from the operating system’s secure entropy pool. This is far stronger than Math.random().

Yes — they use the Web Crypto API (crypto.getRandomValues), which draws from the operating system’s secure entropy pool. This is far stronger than Math.random().

How long should my password be?

At least 16 characters with all character types enabled. Every extra character multiplies the guessing difficulty enormously.

At least 16 characters with all character types enabled. Every extra character multiplies the guessing difficulty enormously.

Do you save the passwords I generate?

Absolutely not. Generation happens in your browser’s memory; nothing is sent to any server or stored anywhere.

Absolutely not. Generation happens in your browser’s memory; nothing is sent to any server or stored anywhere.

What is the “bits of entropy” number?

It measures password strength: 80+ bits is strong, 100+ is excellent. A 16-character password with all sets enabled has about 105 bits.

It measures password strength: 80+ bits is strong, 100+ is excellent. A 16-character password with all sets enabled has about 105 bits.

What is a passphrase?

A password made of several random words. It’s long (which makes it strong) but readable (which makes it memorable).

A password made of several random words. It’s long (which makes it strong) but readable (which makes it memorable).

Are passphrases safer than traditional passwords?

A 5-word random passphrase has more combinations than most 12-character passwords, and you’re far less likely to reuse it because you can actually remember it.

A 5-word random passphrase has more combinations than most 12-character passwords, and you’re far less likely to reuse it because you can actually remember it.

Is my generated password sent anywhere?

No. Everything is generated with your browser’s cryptographic random number generator. Nothing leaves your device.

No. Everything is generated with your browser’s cryptographic random number generator. Nothing leaves your device.

Pro Tips

• Use 16+ characters for important accounts — length beats complexity for resisting brute force.
• Use 16+ characters for important accounts — length beats complexity for resisting brute force.
• Enable all character types (upper, lower, digits, symbols) for maximum entropy.
• Enable all character types (upper, lower, digits, symbols) for maximum entropy.
• One password per site: generate a unique password for every account and store them in a password manager — never reuse.
• One password per site: generate a unique password for every account and store them in a password manager — never reuse.

More FAQs

How should I store generated passwords?

In a reputable password manager (Bitwarden, 1Password, etc.). Never in plain-text notes or spreadsheets.

In a reputable password manager (Bitwarden, 1Password, etc.). Never in plain-text notes or spreadsheets.

Are longer passwords really safer?

Dramatically. Each extra character multiplies cracking time — a 16-character random password is effectively uncrackable by brute force.

Dramatically. Each extra character multiplies cracking time — a 16-character random password is effectively uncrackable by brute force.

How It Works: Under the Hood

Password strength is pure math: entropy = L × log₂(N) bits, where L is length and N is the pool size. A 12-character password from 94 printable ASCII characters has 12 × 6.55 ≈ 79 bits of entropy — meaning an attacker must try ~2⁷⁹ combinations on average. The critical part is how those characters are chosen: this tool uses your browser’s CSPRNG (crypto.getRandomValues()), which draws from the operating system’s entropy pool (hardware noise, timing jitter). That’s fundamentally different from Math.random(), which is a predictable PRNG — fine for games, catastrophic for secrets.

Password strength is pure math: entropy = L × log₂(N) bits, where L is length and N is the pool size. A 12-character password from 94 printable ASCII characters has 12 × 6.55 ≈ 79 bits of entropy — meaning an attacker must try ~2⁷⁹ combinations on average. The critical part is how those characters are chosen: this tool uses your browser’s CSPRNG (crypto.getRandomValues()), which draws from the operating system’s entropy pool (hardware noise, timing jitter). That’s fundamentally different from Math.random(), which is a predictable PRNG — fine for games, catastrophic for secrets.

Each character is selected with modulo-bias elimination (rejection sampling): if the random value doesn’t map evenly onto the pool, it’s discarded and redrawn, so every character is equally likely. No “favorite” characters, no patterns.

Each character is selected with modulo-bias elimination (rejection sampling): if the random value doesn’t map evenly onto the pool, it’s discarded and redrawn, so every character is equally likely. No “favorite” characters, no patterns.

Real-World Use Cases

• New account setup: generating a unique 20-character password for every signup — email, banking, social — so one breach never cascades.
• New account setup: generating a unique 20-character password for every signup — email, banking, social — so one breach never cascades.
• Wi-Fi credential rotation: offices and Airbnb hosts regenerate guest-network passwords monthly; a 16-character alphanumeric is typable yet strong.
• Wi-Fi credential rotation: offices and Airbnb hosts regenerate guest- network passwords monthly; a 16-character alphanumeric is typable yet strong.
• Database credentials: DevOps engineers generate 32-character secrets for production database users, where the password is copied once into a vault and never typed.
• Database credentials: DevOps engineers generate 32-character secrets for production database users, where the password is copied once into a vault and never typed.
• Parental controls: parents set a strong router-admin password kids can’t guess, while keeping the Wi-Fi password itself memorable.
• Parental controls: parents set a strong router-admin password kids can’t guess, while keeping the Wi-Fi password itself memorable.
• Recovery codes: generating high-entropy backup codes for 2FA recovery sheets stored in a safe.
• Recovery codes: generating high-entropy backup codes for 2FA recovery sheets stored in a safe.

Advanced Tips

• Prioritize length over character variety. A 20-character lowercase password (94 bits) beats a 10-character “complex” one (66 bits) — and it’s easier to type. When a site allows long passwords, max out length first.
• Prioritize length over character variety. A 20-character lowercase password (94 bits) beats a 10-character “complex” one (66 bits) — and it’s easier to type. When a site allows long passwords, max out length first.
• Use passphrases where typing matters. Four random words (~50 bits) plus a digit is memorable and strong enough for Wi-Fi. Save the 20-character random strings for password-manager vaults.
• Use passphrases where typing matters. Four random words (~50 bits) plus a digit is memorable and strong enough for Wi-Fi. Save the 20-character random strings for password-manager vaults.
• Generate the maximum, then truncate wisely. If a site caps at 16 characters, generate 32 and take the first 16 — still uniformly random, unlike hand-picking.
• Generate the maximum, then truncate wisely. If a site caps at 16 characters, generate 32 and take the first 16 — still uniformly random, unlike hand- picking.
• Rotate strategically, not constantly. Forced 90-day rotation causes weaker passwords (people just increment a digit). Rotate on suspicion of breach, and use unique-per-site passwords always.
• Rotate strategically, not constantly. Forced 90-day rotation causes weaker passwords (people just increment a digit). Rotate on suspicion of breach, and use unique-per-site passwords always.

Common Mistakes to Avoid

• Reusing one “strong” password everywhere. A 30-character masterpiece reused on 40 sites is one breach away from total compromise. Uniqueness matters more than strength.
• Reusing one “strong” password everywhere. A 30-character masterpiece reused on 40 sites is one breach away from total compromise. Uniqueness matters more than strength.
• Trusting “complexity rules” over entropy. P@ssw0rd! satisfies every corporate policy and falls in seconds to dictionary attacks. Randomness beats rules.
• Trusting “complexity rules” over entropy. P@ssw0rd! satisfies every corporate policy and falls in seconds to dictionary attacks. Randomness beats rules.
• Saving passwords in the browser without a master password. Browser-stored passwords are convenient but extractable by malware. Use a dedicated manager with a strong master password.
• Saving passwords in the browser without a master password. Browser- stored passwords are convenient but extractable by malware. Use a dedicated manager with a strong master password.
• Emailing or messaging passwords. Even a perfect password is compromised the moment it transits an insecure channel. Use a secure share feature or say it in person.
• Emailing or messaging passwords. Even a perfect password is compromised the moment it transits an insecure channel. Use a secure share feature or say it in person.

What Is a Passphrase?

A passphrase is a password made of random words — like correct-horse-battery-staple — instead of gibberish characters. Because each word adds a huge amount of entropy, a 4–5 word passphrase can be stronger than a short complex password and far easier to remember and type.

A passphrase is a password made of random words — like correct-horse-battery- staple — instead of gibberish characters. Because each word adds a huge amount of entropy, a 4–5 word passphrase can be stronger than a short complex password and far easier to remember and type.

Passphrases vs Random Passwords

Use a passphrase for accounts where you type the password yourself (laptops, WiFi, master passwords). Use a fully random string — which this password generator also creates — for accounts managed by a password manager. Either way, generation happens locally in your browser; nothing is ever sent or stored.

Use a passphrase for accounts where you type the password yourself (laptops, WiFi, master passwords). Use a fully random string — which this password generator also creates — for accounts managed by a password manager. Either way, generation happens locally in your browser; nothing is ever sent or stored.