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Bcrypt Generator

Generate secure Bcrypt password hashes locally. Features benchmark testing, hash verification, and visual breakdown of hash components.

User Rating 0.0 ★★★★★
Total Usage 2 times
Category Security

Higher = More Secure but Slower. Recommended: 10-12.

This test runs hashing cycles on your specific device to determine latency.

Cost Time (ms) Rating
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About

Security relies on defense in depth, and password storage is a critical layer. This tool generates Bcrypt hashes entirely within your browser using JavaScript, ensuring plain-text credentials never traverse a network. Developers often underestimate the impact of the Work Factor (Cost) on server performance. A cost that is too high renders a system vulnerable to Denial of Service (DoS) attacks, while a cost that is too low exposes it to brute-force offline cracking.

The standard Bcrypt algorithm implements key stretching to resist hardware-accelerated attacks. Unlike fast hashing functions like MD5 or SHA-256, Bcrypt remains computationally expensive by design. The Salt Rounds parameter determines the logarithmic iteration count, meaning an increment of 1 doubles the required processing time. This tool provides real-time benchmarking to calibrate this setting for your specific hardware context.

bcrypt password hashing security tools salt rounds encryption

Formulas

A Bcrypt hash string encodes the algorithm, cost, salt, and hash into a single modular crypt format (MCF) string.

$2a$10$vI8aRD9dO8......e37G2l

Where the structure is defined as:

{
Alg = Identifier ($2a, $2b, $2y)Cost = Logarithmic IterationsSalt = 22 Base64 CharactersHash = 31 Base64 Characters

Reference Data

Cost Factor (N)Iterations (2N)Est. Time (Modern CPU)Use Case Context
8256~10 msLegacy / IoT Devices
101,024~50 msDefault Web Standard
124,096~250 msHigh Security Auth
1416,384~1,000 msAdmin/Root Access
1532,768~2-3 sParanoid / Cold Storage

Frequently Asked Questions

Generating hashes locally means your plain-text password never leaves your device's memory. It eliminates the risk of Man-in-the-Middle (MitM) attacks or server-side logging of sensitive data during the generation process.
The rule of thumb is as slow as possible without negatively impacting user experience. For interactive logins, a delay of 250ms to 500ms is acceptable. Most modern web systems default to a cost of 10 or 12. Use the Benchmark tab to test your specific hardware limits.
No. Bcrypt is a one-way cryptographic function. It is designed to be irreversible. To verify a password, you must hash the input candidate with the same salt and cost, then compare the resulting strings.
Bcrypt automatically generates a random "salt" for every hash. This ensures that two users with the same password will have completely different hash strings, preventing Rainbow Table attacks.