Password Generator Strong & Private
Generate cryptographically secure passwords, memorable Diceware passphrases, and numeric PINs with instant entropy analysis.
How to Use the Password Generator
This utility generates cryptographically random passwords, memorable Diceware passphrases, and numeric PINs directly in your browser's sandbox using the hardware-backed window.crypto.getRandomValues API. All operations run 100% locally with zero server transmissions.
Step-by-Step Guide
- Choose Generator Mode: Select Password for alphanumeric strings, Passphrase for memorable multi-word passphrases, or PIN Code for numeric sequences.
- Configure Length & Character Sets: Adjust length from 4 to 64 characters or tap quick preset chips (8, 12, 16, 20, 24, 32). Toggle Uppercase, Lowercase, Numbers, and Symbols.
- Apply Exclusion Rules: Enable Exclude Lookalikes to strip ambiguous glyphs (
1, l, I, 0, O) or No Repeated Characters for unique permutations. - Select Quantity & Copy: Choose single mode or batch generate up to 20 passwords. Click Copy or press
Ctrl+Cto copy directly to your clipboard with instant in-button visual confirmation.
Password Entropy & Brute-Force Resistance Matrix
The table below outlines cryptographic strength metrics, calculated across standard character pool configurations assuming a high-end offline brute-force rig testing 10 billion guesses per second:
| Password Type | Length | Character Pool Size | Shannon Entropy | Crack Time (10B/sec) | Security Classification |
|---|---|---|---|---|---|
| PIN Code | 4 digits | 10 (digits only) | 13.3 bits | < 1 millisecond | Low / Device Lock |
| Short Password | 8 chars | 62 (letters + digits) | 47.6 bits | ~5.5 hours | Vulnerable |
| Standard Password | 12 chars | 94 (full ASCII set) | 78.7 bits | ~740,000 years | Strong |
| Secure Password | 16 chars | 94 (full ASCII set) | 104.9 bits | ~85 Trillion centuries | Military Grade |
| Diceware Passphrase | 5 words | 7,776 (EFF dictionary) | 64.6 bits | ~76,000 years | High / Memorable |
Need to generate cryptographic hashes?
Compute SHA-256, SHA-512, and MD5 checksums 100% locally in your browser.
Frequently Asked Questions
Every password, passphrase, and PIN is generated directly inside your browser using the native Web Cryptography API (
window.crypto.getRandomValues). Your confidential secrets never touch any network connection, analytics collector, or remote server.
Shannon entropy measures the exponential complexity of an automated search space in bits (log2 of total unique combinations). Each extra bit of entropy doubles the time required to brute-force a credential. Passwords rated above 80 bits cannot be cracked by modern computing infrastructure.
Characters such as numeral
1, lowercase l, uppercase I, numeral 0, and uppercase O are frequently misread on mobile screens or in printed documents. Excluded bracket options also prevent syntax breakages in automated shell environments, XML/HTML templates, and database configuration files.
Multi-word passphrases provide substantial entropy while retaining human mnemonic memorability. Typing
velvet-crystal-summit-falcon is far less error-prone and resistant to shoulder surfing compared to typing arbitrary random strings like k9#F2!xP9$qL.
Grover's algorithm provides a quadratic speedup for brute-force searches on quantum hardware, effectively halving key entropy (80 bits behaves like 40 bits of quantum security). For long-term quantum resistance, passwords and master encryption passphrases should exceed 128 bits of classical entropy (such as 24+ character strings or 8-word passphrases).