Secure Password Generator & Bcrypt Hash Tool
Generate cryptographically secure passwords and bcrypt hashes. Test PHP password_hash online with custom algorithm and cost. Free and private.
This tool generates passwords and hashes 100% locally in your browser using theWeb Crypto API and bcrypt.js. No data is ever transmitted to a server, ensuring your credentials never leave your device.
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All sensitive computations like password generation and hashing occur 100% locally in your browser. No data is ever transmitted, logged, or stored on our servers.
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Secure Password Generator & Bcrypt Hash Tool
Generate cryptographically secure passwords using browser-native crypto randomness. Our tool supports full character customization, real-time strength analysis, and optional bcrypt hashing with 12 salt rounds for direct database storage. Whether you're a developer building authentication systems, or a user creating highly secure credentials, this tool provides cryptographically secure password generation with zero data retention.
Local Privacy First
Powered by the Web Crypto API - all data is processed strictly within your browser for total privacy.
Secure Bcrypt Salting
Generate industry-standard bcrypt hashes locally. Securely salt your passwords before storing them in your database.
Zero Server Transmission
Your passwords and hashes never leave your device. We have zero server tracking and never log your data.
Professional Customization
Control entropy with customizable length and character sets. Get real-time security strength analysis.
Why You Should Never Use Math.random() for Passwords
Many online password generators use JavaScript's Math.random() to generate characters. This is a critical security vulnerability. Math.random() uses the xorshift128+ algorithm  a fast, predictable pseudorandom number generator designed for performance, not security.
If an attacker knows the browser engine and can observe a few outputs, they can mathematically reverse-engineer the internal state and predict every subsequent 'random' password the generator will produce. This is not theoretical  published research has demonstrated full state recovery from as few as 3 outputs.
Our generator uses Node.js's crypto.randomInt(), which sources entropy from the operating system's CSPRNG (Cryptographically Secure Pseudorandom Number Generator). On Linux, this reads from /dev/urandom backed by hardware interrupt timing noise. On Windows, it uses BCryptGenRandom. The output is computationally indistinguishable from true randomness.
Understanding Bcrypt: Why It's the Gold Standard for Password Storage
Bcrypt is an adaptive password hashing algorithm designed by Niels Provos and David Mazières in 1999, based on the Blowfish cipher. Unlike general-purpose hash functions (MD5, SHA-256), bcrypt is intentionally slow and memory-hard, making GPU-parallelized brute-force attacks economically impractical.
Every bcrypt hash contains three critical components embedded in the output string: the algorithm version ($2a$ or $2b$), the cost factor (our tool uses 12, meaning 2^12 = 4096 iterations of key expansion), and a unique 128-bit salt auto-generated for each hash. This means even identical passwords produce completely different hash strings.
At cost factor 12, a single hash computation takes approximately 250 milliseconds on modern server hardware. This means an attacker attempting to brute-force a single bcrypt hash would need roughly 8 years per trillion guesses  compared to mere seconds for the same operation against SHA-256.
Password Entropy: The Mathematics of Uncrackable Credentials
Password strength is measured in bits of entropy  the logarithmic measure of the total keyspace. Each additional bit of entropy doubles the time required for exhaustive search. A password with 80+ bits of entropy is considered computationally unbreakable by current technology.
With our full character set enabled (94 printable ASCII characters), each character contributes approximately 6.55 bits of entropy. A 16-character password therefore provides ~104 bits of entropy  exceeding the security of a 128-bit AES key when accounting for the bcrypt cost factor.
For perspective: at 10 billion guesses per second (a theoretical maximum for specialized hardware), cracking a 16-character, full-charset password would require approximately 6.4 Ã- 10^12 years. The universe is only 1.38 Ã- 10^10 years old.
Password Hashing Algorithm Comparison
| Algorithm | Security Assessment |
|---|---|
| MD5 | Completely broken. A modern GPU can compute 40+ billion MD5 hashes per second. Never use for passwords. |
| SHA-256 | Cryptographically sound but too fast for passwords. 10+ billion hashes/sec on consumer GPUs enables rapid brute-force. |
| bcrypt (cost 12) | Gold standard. ~250ms per hash makes brute-force economically impractical. Built-in salt prevents rainbow tables. |
| Argon2id | Newest contender (PHC winner). Memory-hard design. Excellent but less universal library support than bcrypt. |
| scrypt | Memory-hard alternative. Good protection against ASIC attacks but complex to tune correctly. |