bcrypt Hash Tool

bcrypt is a password hashing function designed specifically for secure password storage. Unlike fast hash functions like SHA-256, bcrypt is intentionally slow and includes automatic salt generation. This makes it extremely resistant to brute-force attacks and rainbow table attacks, making it the gold standard for password security in modern applications.

Salt rounds (also called cost factor) determine how many iterations the bcrypt algorithm performs. Higher salt rounds mean exponentially more computation time, making the hash more secure but slower. The recommended range is 12-14 for most applications. Each increment doubles the computation time, so balance security needs with performance requirements.

bcrypt automatically generates a unique random salt for each hash, even when hashing the same password. This is a security feature that prevents rainbow table attacks. Each bcrypt hash contains the salt within it, so the same password will always verify correctly against its hash, despite appearing different.

Use the "Verify Hash" tab to check if a plain text password matches a bcrypt hash. Enter the original password in the text field and the bcrypt hash in the hash field. The tool will securely compare them and tell you if they match. This simulates how authentication systems verify user passwords.

While this tool processes hashes on our secure servers, we recommend using it only for testing and development purposes. For production systems, implement bcrypt directly in your application code. Never use real user passwords in online tools. Use test passwords or dummy data instead.

For most applications, 12-14 salt rounds provide good security. Use 12 for high-traffic applications where speed matters, 13-14 for typical applications, and 15+ only for highly sensitive systems. Test the performance impact on your hardware before deciding. Remember that higher rounds exponentially increase computation time.

Yes, bcrypt is a standardized algorithm with implementations in virtually every programming language including Python, Java, C#, PHP, Ruby, Go, and more. The hash format is compatible across all implementations, so you can generate a hash in one language and verify it in another.

bcrypt is superior to fast hash functions (MD5, SHA-1, SHA-256) for password storage because it's designed to be slow and includes automatic salting. It's comparable to other password-specific functions like scrypt and Argon2, but bcrypt has the advantage of being widely adopted, well-tested, and supported across all platforms.

The salt rounds value is embedded within the bcrypt hash itself, so you don't need to store it separately. When verifying a password, the bcrypt library automatically extracts the salt rounds from the hash. You only need to know the salt rounds when generating new hashes.

Yes, but you'll need to rehash passwords when users log in since you can't convert existing hashes to bcrypt format. A common migration strategy is to verify against the old hash first, and if successful, generate a new bcrypt hash and replace the old one. This gradually migrates your user base to the more secure system.

bcrypt is intentionally designed to be slow to make brute-force attacks impractical. While a fast hash like SHA-256 can compute millions of hashes per second, bcrypt with 12 rounds might only compute hundreds per second. This slowness is a feature, not a bug - it protects your users' passwords even if your database is compromised.

bcrypt hashes follow the format: $2a$[rounds]$[salt][hash]. For example: $2a$12$R9h/cIPz0gi.URNNX3kh2OPST9/PgBkqquzi.Ss7KIUgO2t0jWMUW. The hash contains the algorithm version ($2a), salt rounds (12), salt (22 characters), and the actual hash (31 characters). This self-contained format makes verification straightforward.