Bcrypt Generator & Verifier
Hash passwords securely with customizable salt rounds or verify password matches client-side.
Enter a password below to generate hash
Higher values exponentially increase security and computing time
All security hashing is performed exclusively in your browser using pure JavaScript. Your password inputs and output hashes never touch our servers, protecting your credentials.
In database security, storing passwords in plain text is a critical error. A single breach can expose hundreds of credentials instantly. To protect passwords, developers rely on specialized cryptographic algorithms designed specifically to withstand cyberattacks. Our free Bcrypt generator & verifier lets you generate secure Blowfish-based hashes client-side, adjust cost parameters, and safely crosscheck hashes with candidate strings. Every computation is run locally in your browser memory — providing developers and administrators with robust diagnostic options while guaranteeing absolute privacy.
What is Bcrypt Hashing?
Designed by Niels Provos and David Mazières in 1999, Bcrypt is a password-hashing function based on the Blowfish symmetric block cipher. Unlike fast general-purpose hashes such as MD5 or SHA-256 (which are designed for speed and data transmission), Bcrypt is intentionally structured to be slow and computationally intensive. This design makes brute-force attacks and hardware-accelerated dictionary attacks (using GPUs or ASICs) extremely costly and time-consuming, safeguarding user accounts even if the server database is leaked.
Why Salt and Cost Factors Matter
Bcrypt achieves its strong security profile through two key properties:
- Cryptographic Salting: Bcrypt automatically generates a unique 128-bit random salt for every password. This salt is merged with the input before hashing. Consequently, two identical passwords will result in entirely different hashes. This renders "Rainbow Tables" (precomputed tables of plain texts and hashes) completely useless for cracking Bcrypt hashes.
- Adjustable Cost Factor: The cost factor (often
called "salt rounds") represents the number of iterations of the Blowfish key expansion
phase, calculated as
2^rounds. For instance, a cost factor of 10 means 1,024 iterations. Tweak this factor to keep up with CPU hardware advancements over time: as processors get faster, you can raise the cost factor to maintain high crack difficulty without rewriting your database framework.
How to Use This Bcrypt Tool
- To Generate: Type or paste your plaintext password into the "Hash Generator" section.
- Set rounds: Adjust the Cost Factor slider. A
factor of
10is recommended for standard browser execution, balancing speed and security. - Check warning: Keep rounds below 13. High rounds take significantly longer and might lock up single-threaded web browsers.
- Copy or save: Copy the output to your clipboard or download it as a plain-text file.
- To Verify: Click the "Hash Verifier" tab, input the plaintext password and paste the candidate Bcrypt hash. The checker will output whether they align.
Frequently Asked Questions
What does a standard Bcrypt hash look like?
$2a$ or $2b$), the cost factor (e.g. $10$), a 22-character salt, and a
31-character encrypted hash signature.