What makes a password strong?

Length (16+ characters), diverse character variety (letters, numbers, symbols), and high unpredictability (entropy).

Updated: August 2026 • Verified v1.2

Strong Password Generator

Fun & DecisionPopular

Generate ultra-secure, cryptographically random passwords and passphrases with length, character set, and readability filters.

Local Browser Execution: Your input is processed locally in your browser and is not sent to UTL servers.

Entropy (bits) = L × log2(N), where L = length and N = character pool size (e.g. 26 + 26 + 10 + 26 = 88)

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Understanding Your Results

Calculates cryptographic entropy in bits (Entropy = Length * log2(CharsetSize)). 16+ character passwords with mixed character sets exceed 90+ bits of entropy, making brute-force cracking mathematically infeasible.

Practical Guidance & Next Steps

Use at least 16 characters for critical logins (banking, primary email, password manager master key). Keep 'Exclude ambiguous characters' enabled if you will need to type the password manually on mobile devices.

What is this?

A zero-knowledge password generator that produces high-entropy passwords with custom length (up to 128 characters), symbols, numbers, and ambiguous character filtering.

How does it work?

1. Choose your desired password length (e.g. 16 to 32 characters). 2. Select character sets (Uppercase, Lowercase, Numbers, Symbols). 3. Avoid ambiguous characters (like 0, O, l, 1, I) if required. 4. Click 'Copy' to immediately place it in your clipboard.

Why use it?

Password reuse is the #1 vector for account breaches. Generating distinct 16+ character high-entropy passwords protects against brute-force and dictionary attacks. No generated passwords ever leave your device.

Technical Scope & Calculation Limitations

Generates random character strings. Memorability is low; generated passwords should be stored in a trusted password manager (e.g. Bitwarden, 1Password).