This tool runs 100% inside your browser engine.
Your passwords, hashes, and salt rounds are processed exclusively by your local JavaScript runtime and never leave your device. No network requests are made. No analytics, logs, or telemetry capture your data. You can verify this by opening DevTools → Network tab while using the tool.
Bcrypt Password Crypt
Secure client-side hashing, verification, bulk testing & benchmarks
All encryption operations compile inside your local JavaScript context. Zero outbound network requests are generated.
Bcrypt Hashing Sandbox
Balanced for interactive application logins (50ms - 200ms delay). Combines security with excellent user experience.
Step-by-Step Guide
Enter a Password
Type any plaintext password or credential string into the hashing input. Use the cost factor slider (4-15) to control the computational difficulty of the salt rounds.
Generate a Bcrypt Hash
Click Generate Hash. The bcryptjs engine runs entirely in your browser, producing a salted hash in the $2a$ or $2b$ Blowfish format. The result is copy-ready.
Inspect Hash Structure
The Analyzer tab decodes any existing Bcrypt hash into its structural parts: algorithm identifier, cost factor, 22-character salt, and 31-character checksum.
Verify or Bulk Process
Use the Verify tab to compare a password against a known hash. For large datasets, the Bulk tab accepts multi-line inputs and exports results as JSON, CSV, or plaintext.
Frequently Asked Questions
Is it safe to generate or verify password hashes on this web sandbox?
Absolutely. All hashing, salt generation, and verification operations compile inside your local web browser context using pure JS WebAssembly routines. No input credentials or secret hashes are ever sent to PrimeByteLabs or any external API servers.
What is the Bcrypt cost factor and how does it secure passwords?
The cost factor (rounds) represents the logarithmic iterations count (2^cost) utilized during the Blowfish crypt key setup phase. For example, a cost of 10 runs 1,024 rounds, while a cost of 12 runs 4,096 rounds. This exponential computing delay protects database credentials from modern high-performance GPU cracking rigs.
How can I extract the salt or check the cost factor from a hashed string?
Bcrypt hashes conform to a modular structure separated by dollar signs. A hash like '$2a$10$N9qo8uLO...': '$2a$' identifies the algorithm version, '10' designates the cost rounds, followed by a 22-character cryptographic salt, and a 31-character checksum. Our integrated decoder parses and highlights these sections automatically.
What cost factor should I specify for my application backend?
A cost factor of 10 or 12 is the recommended industry standard for normal web applications, achieving solid login safety under 250 milliseconds. Set cost factors of 4 to 8 for automated test seeding, and 13+ only for high-security offline cold storage credentials.