Why Bcrypt Instead of MD5 or SHA-256?
Generic hash functions like MD5 and SHA-256 are designed for speed — they can process gigabytes of data per second. This makes them excellent for file integrity verification but terrible for password hashing. A fast hash means an attacker who obtains your database can try billions of password candidates per second. Bcrypt solves this by being intentionally slow and incorporating a configurable work factor that increases computation time exponentially.
- MD5: ~10 billion hashes/second on modern GPU — passwords cracked in seconds
- SHA-256: ~5 billion hashes/second — marginally better but still far too fast
- Bcrypt (10 rounds): ~100 hashes/second — makes brute-force attacks impractical
- Each additional bcrypt round doubles the computation time
- Built-in salt prevents rainbow table attacks (pre-computed hash lookups)
Never store passwords using MD5 or SHA-256 in production applications. These algorithms are far too fast for password hashing and can be cracked in seconds with modern hardware. Always use bcrypt, scrypt, or Argon2.
Understanding Salt Rounds (Work Factor)
The salt rounds parameter controls how computationally expensive the hash operation is. The cost scales exponentially: each additional round doubles the computation time. A value of 10 takes about 100ms, 12 takes about 400ms, and 14 takes about 1.5 seconds. Choosing the right value involves balancing security against user experience — login should not take more than a second or two.
- Rounds 4-6: Very fast (~1-5ms), suitable only for development/testing
- Rounds 8-10: Good balance for most web applications (~25-100ms)
- Rounds 12: High security for sensitive applications (~400ms)
- Rounds 14: Maximum security, noticeable delay on login (~1.5s)
- OWASP recommends a minimum of 10 rounds for production applications
How to Generate and Verify Bcrypt Hashes
The tool provides two modes: generation (password → hash) and verification (password + hash → match/no match).
- Generate: Enter a password and select salt rounds → get a bcrypt hash string
- Verify: Enter a password and an existing bcrypt hash → check if they match
- The generated hash includes the algorithm identifier, salt rounds, salt, and hash in a single string
- Each generation produces a different hash due to random salt — this is expected and correct
Generating the same password twice produces different bcrypt hashes because each hash includes a unique random salt. This is correct behavior — it prevents attackers from using pre-computed lookup tables.
Development and Debugging Use Cases
Developers use bcrypt hashing tools throughout the authentication development lifecycle. When seeding a database with test users, you need pre-computed bcrypt hashes for test passwords. When debugging failed login attempts, you need to verify whether the password submitted by the user matches the hash in the database. When migrating authentication systems, you need to verify that hashes from the old system are correctly validated by the new system. Our tool handles all of these scenarios instantly, without writing custom scripts or exposing passwords to external services.
Secure Password Hashing in Your Browser
Our Bcrypt Generator provides the two most essential password hashing operations — generation and verification — with complete privacy. No passwords or hashes are ever sent to a server. Configure your salt rounds, generate your hash, and verify your passwords with confidence. Whether you are seeding a database, debugging authentication, or learning about password security, try it now and experience bcrypt hashing with zero risk.