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PrescosoftPassword Studio
🔐 Premium password tools · no account required

Free Password Generator & Strength Checker — Secure, Private, Client-Side

Create strong random passwords or memorable passphrases, generate multiple results at once, exclude ambiguous characters, and evaluate strength with entropy, crack-time guidance, and visual feedback.

Generate PasswordsCheck My Password
3Separate analysis panels
100%Client-side experience
1-clickCopy generated results

Current Password

A secure password is generated instantly with real-time strength analysis.

Password Strength Analysis
For the current generated password shown above.
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Entropy—
Estimate—

Password Generator

Customize the rules, generate one or many passwords, then review the generator-specific strength analysis for the active generated result.

Uppercase
Lowercase
Numbers
Symbols
Exclude ambiguous characters

Removes characters such as 1, l, I, 0, and O.

Add number
Capitalize words
Active Generated Password
Click any result below to analyze it here.
Password Strength Analysis
For the active password created in the Password Generator section.
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Entropy—
Estimate—

Why Client-Side Password Generation Matters

Most free online password generators process your request on a remote server. That means the password travels across the internet, potentially gets logged, and could be intercepted. Prescosoft Password Generator works differently.

🔐 How This Tool Works

Passwords are generated using your browser's crypto.getRandomValues() API — the same cryptographic standard used by security software. All randomness comes from your device, not from a server. Results appear in your browser and exist only in your session. When you close or refresh the page, they are gone.

🚫 What We Don't Do

No passwords are transmitted to any server. No cookies track what you generate. No analytics record your password data. No account is required. Unlike password manager tools (1Password, Bitwarden, LastPass) that generate passwords server-side or push signup, this tool generates everything locally.

📊 Understanding Entropy

Password entropy measures unpredictability in bits. A 16-character password with all character types (95 printable ASCII) has ≈105 bits of entropy. Security experts recommend at least 80 bits for important accounts. A 20-character random password achieves ≈131 bits — considered excellent resistance to brute-force attacks.

📝 Password vs. Passphrase

A password is a shorter string of random characters (e.g., Kx9#mP2$vL). A passphrase uses random words with separators (e.g., anchor-bright-cedar-delta-ember). Passphrases can match or exceed password entropy while being easier to remember — ideal for master passwords you type frequently.

Frequently Asked Questions

Answers to common questions about password generation, entropy, and security.

Is this password generator safe to use?▾

Yes. This password generator runs entirely in your browser using the Web Crypto API (crypto.getRandomValues()), which provides cryptographically secure random number generation. Passwords are never sent to any server, stored in any database, or logged anywhere. Unlike password managers that generate passwords server-side or push signup, all processing is 100% client-side.

What makes a strong password?▾

A strong password has high entropy — typically 80+ bits. This is achieved through length (16+ characters), character variety (uppercase, lowercase, numbers, symbols), randomness (no predictable patterns), and uniqueness (never reused across sites). A 20-character random password with all character types has approximately 131 bits of entropy.

What is password entropy?▾

Password entropy measures the randomness and unpredictability of a password in bits. It is calculated as: length × log₂(charset size). For example, a 16-character password using all 95 printable ASCII characters has 16 × log₂(95) ≈ 105 bits of entropy. Higher entropy means exponentially more guesses required to crack it.

How many characters should my password be?▾

For important accounts (email, banking, password manager master), use at least 16 characters with mixed character types, or 20+ for maximum security. For less critical accounts, 12 characters is a reasonable minimum. Passphrases with 5–7 random words are also effective and easier to remember.

What is the difference between a password and a passphrase?▾

A password is typically a shorter string of random characters (e.g., Kx9#mP2$vL), while a passphrase is a longer sequence of random words (e.g., anchor-bright-cedar-delta-ember). Passphrases can achieve similar or higher entropy with fewer characters to remember, making them ideal for master passwords you need to type frequently.

Are generated passwords stored anywhere?▾

No. Generated passwords exist only in your browser session and are destroyed when you refresh or close the page. Nothing is stored on any server, no cookies track your generated passwords, and no analytics capture your password data.

How does the strength checker work?▾

The strength checker uses entropy-first analysis: it calculates the character pool size and password length to estimate base entropy, then applies lighter penalties for known weak patterns — common dictionary words, keyboard sequences (qwerty), repeated characters, short length, and low character diversity. The result is a score with a label (Weak through Excellent) and a crack-time estimate.

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