DevToolKit

Bcrypt Hash Generator | Free Online Tool - DevToolKit

Free bcrypt hash generator. Generate bcrypt password hashes with configurable salt rounds. All processing in your browser.

10
Recommended — 2^10 = 1,024 iterations

What is Bcrypt Hash Generator?

Bcrypt is a password hashing function based on the Blowfish cipher, designed by Niels Provos and David Mazieres. It incorporates a salt to protect against rainbow table attacks and a cost factor (salt rounds) that makes it intentionally slow, protecting against brute-force attacks. Bcrypt is one of the most recommended algorithms for password hashing.

How to Use Bcrypt Hash Generator

1. Enter the text or password you want to hash. 2. Adjust the salt rounds using the slider (higher = more secure but slower). 3. Click the Generate button to create the bcrypt hash. 4. Click Copy to copy the hash to your clipboard.

How Bcrypt Hash Generator Works

Bcrypt uses the Blowfish cipher in a key setup phase that is intentionally expensive. The cost factor (salt rounds) determines the number of iterations as 2^cost, making the hash computation exponentially slower as the cost increases. A random 128-bit salt is generated and embedded in the output. The resulting hash string includes the algorithm identifier ($2b$), cost factor, salt, and hash — all in a single 60-character string. This tool runs the bcrypt algorithm entirely in your browser using JavaScript.

Common Use Cases

  • Securely hashing passwords before storing in a database
  • Generating password hashes for authentication systems
  • Testing and verifying bcrypt implementations
  • Creating hashed passwords for configuration files
  • Comparing plain text against expected bcrypt output

Frequently Asked Questions

What are salt rounds in bcrypt?▼

Salt rounds (also called the cost factor) determine how many iterations bcrypt performs. The actual iterations are 2^rounds — so 10 rounds = 1,024 iterations, 12 rounds = 4,096. Higher rounds are more secure but take longer to compute.

What is a good number of salt rounds?▼

A cost factor of 10-12 is commonly recommended. 10 is the default and provides good security for most applications. Increase to 12+ for high-security applications, but test that the computation time is acceptable for your use case.

Why is bcrypt better than MD5 or SHA for passwords?▼

Bcrypt is specifically designed for password hashing. It is intentionally slow (configurable via salt rounds), includes a built-in salt, and is resistant to GPU-based attacks. MD5 and SHA are designed to be fast, which makes them vulnerable to brute-force attacks when used for passwords.

Can I decrypt a bcrypt hash?▼

No. Bcrypt is a one-way hash function. You cannot reverse a bcrypt hash to get the original password. To verify a password, you hash the candidate and compare it to the stored hash.

Is my data sent to a server?▼

No. All hashing is performed entirely in your browser using JavaScript. Your password or text never leaves your machine.

Related Tools

MD5 Hash Generator

Free MD5 hash generator. Generate MD5 checksums from any text or string instantl...

SHA-256 Hash Generator

Free SHA-256 hash generator. Create SHA-256 hashes from text securely in your br...

SHA-1 Hash Generator

Free SHA-1 hash generator online. Generate SHA-1 hashes from any text string ins...

SHA-512 Hash Generator

Free SHA-512 hash generator. Create SHA-512 hashes from text with this secure br...

HMAC Generator

Enter message + secret key → get HMAC in hex and base64 instantly. Supports SHA-...