How long should a strong password be?

Security experts recommend a minimum of 12 characters for general accounts, 16+ characters for email, banking, and work accounts, and 20+ characters for administrator or root accounts. Each additional character exponentially increases the time required to brute-force crack a password.

Is this password generator safe to use?

Yes. This password generator runs entirely inside your browser using the Web Crypto API (window.crypto.getRandomValues), which is cryptographically secure. No passwords are ever sent to or stored on any server. Everything remains on your device and is never logged.

What are ambiguous characters and should I exclude them?

Ambiguous characters are visually similar characters that can cause confusion when reading or typing a password manually — for example, the number 0 and the letter O, or the lowercase l and the number 1. If you need to type or read out a password, enable 'Exclude ambiguous characters'. If your password will only ever be pasted or autofilled, you can safely include them for maximum security.

What is the difference between entropy and password strength?

Password entropy is a mathematical measure of unpredictability, expressed in bits. Higher entropy means more possible combinations and exponentially harder to crack. A password with 70+ bits of entropy is considered strong for most uses; 35+ bits is excellent. Entropy depends on both length and the size of the character set used.

Strong Password Generator – Free, Secure & Customizable

Name: Strong Password Generator
Availability: InStock
Rating: 4.9 (5812 reviews)
Author: WebToolOcean

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Entropy: – bits · Character pool: –

Password Length

4 (min) 64 (recommended) 128 (max)

Character Types

Uppercase A–Z

Lowercase a–z

Numbers 0–9

Symbols !@#$%

Options

Exclude ambiguous characters

Removes 0, O, l, 1, I — great if you need to type the password manually

Exclude similar-looking characters

Also removes v, V, u, U, w, W to prevent visual confusion

Passwords to generate:

Generated Passwords

Passwords generated using window.crypto.getRandomValues — cryptographically secure. Never stored or transmitted.

Step by Step

How to Generate a Strong Password

Create a secure, random password in under 30 seconds — no account, no software needed.

📏

Set Password Length

Drag the slider to your required length. We recommend 16+ characters for most accounts and 20+ for email and banking.

🔤

Choose Character Types

Select uppercase, lowercase, numbers, and symbols. More character types = exponentially stronger password.

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Apply Exclusions

If you'll need to type the password manually, enable "Exclude ambiguous characters" to avoid confusion between 0, O, l, and 1.

📋

Copy & Store Safely

Click Generate then Copy. Store your password in a reputable password manager — never in plain text or email.

Best Practices

Password Strength by Length & Character Set

Entropy (bits of randomness) is the real measure of password strength. Here's how length and character variety affect how long your password would take to crack.

Length	Character Set	Entropy (bits)	Crack Time (estimate)	Verdict
8 chars	Lowercase only (a–z)	~37 bits	Seconds to minutes	❌ Very Weak
8 chars	Letters + numbers	~47 bits	Hours	❌ Weak
12 chars	Letters + numbers	~71 bits	Months	⚠️ Moderate
16 chars	Letters + numbers + symbols	~105 bits	Millions of years	✅ Strong
20 chars	All character types	~131 bits	Billions of years	✅ Very Strong
32 chars	All character types	~210 bits	Effectively uncrackable	✅ Excellent

Security Tips

Password Security Best Practices

Generating a strong password is only step one. Follow these rules to keep your accounts safe.

Rule	Why It Matters	Priority
Use unique passwords	If one site is breached, credential stuffing attacks try your password on every other service you use.	🟢 Critical
Use a password manager	Bitwarden, 1Password, Dashlane, and similar tools store and autofill strong passwords securely. Never rely on memory for random passwords.	🟢 Critical
Enable 2FA / MFA	Two-factor authentication protects your account even if your password is compromised. Use an authenticator app (not SMS where possible).	🟢 Critical
Never reuse passwords	Especially for email, banking, and work accounts. These are the highest-value targets for attackers.	🟡 Important
Avoid dictionary words	Dictionary attacks can crack common-word passwords in seconds, even with numbers substituted (p@ssw0rd is not safe).	🟡 Important
Change compromised passwords	Check haveibeenpwned.com regularly. If your email appears in a breach, change the password for that service and any reused passwords immediately.	🟠 Recommended

FAQ

Frequently Asked Questions About Password Security

Everything you need to know about creating and managing strong passwords.

What makes a password strong?

A strong password is long (at least 16 characters), completely random, and mixes uppercase letters, lowercase letters, numbers, and symbols. It should never contain dictionary words, names, birthdates, or keyboard patterns like "qwerty" or "123456". The best passwords are generated randomly, not invented by humans.

How long should my password be?

At minimum, 12 characters for general accounts and at least 16 characters for email, banking, and work logins. For administrator accounts, 20+ characters is recommended. Each additional character multiplies the number of possible combinations exponentially — a 20-character password using all character types would take billions of years to brute-force with current technology.

Is this password generator cryptographically secure?

Yes. This tool uses the Web Crypto API (window.crypto.getRandomValues), which is a cryptographically secure pseudo-random number generator (CSPRNG) built into every modern browser. It is the same standard used by security software and operating systems for key generation. No passwords are ever sent to any server — generation happens entirely inside your browser.

Should I use the same password for multiple accounts?

Never. This is one of the most common and dangerous security mistakes. When one service is breached — which happens to major companies regularly — attackers use automated tools to try your exposed password on hundreds of other sites in seconds. This is called a credential stuffing attack. Always use a unique, randomly generated password for every account, stored in a password manager.

What are ambiguous characters?

Ambiguous characters are pairs that look visually identical in many fonts: the number 0 and the letter O, the lowercase l and the number 1, and the uppercase I. If you need to read or type a password from a printed sheet or screen, excluding these characters prevents errors. If your password will only ever be copied or autofilled by a password manager, you can safely include them for maximum security.

What is password entropy?

Entropy measures the unpredictability of a password in bits. It's calculated as: length × log₂(character pool size). A password with 70 bits of entropy has 2⁷⁰ possible combinations — about 1.18 quadrillion. At 100 bits, it's effectively uncrackable with any foreseeable technology. This tool shows entropy in real time so you can see exactly how strong each password is.

Where should I store my generated passwords?

Use a dedicated password manager — never store passwords in plain text files, spreadsheets, email drafts, or browser notes. Reputable options include Bitwarden (free and open source), 1Password, Dashlane, and KeePass (offline). Password managers encrypt your vault and autofill passwords, making strong, unique passwords practical for every account.

How often should I change my passwords?

Modern security guidance (NIST SP 800-63B) no longer recommends routine periodic password changes. Instead, change a password immediately if: a service you use is breached, you suspect your account is compromised, you see suspicious login activity, or you shared the password with someone and that access should be revoked. Strong, unique, randomly generated passwords don't need arbitrary rotation schedules.

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