Bcrypt Generator
Generate and verify bcrypt hashes locally in your browser. No data is transmitted.
Generate Hash
4 (fastest)16 (strongest)
Verify Hash
How bcrypt works
Bcrypt is a one-way hashing function — you cannot reverse a hash to get the original password. Verification computes a new hash and compares the result.
Bcrypt Password Hasher
Generate bcrypt hashes for testing and verify passwords against existing hashes. Choose salt rounds to balance security and speed. All computation happens in your browser using bcryptjs — no password ever leaves your device.
Frequently Asked Questions
- What is bcrypt?
- Bcrypt is a password hashing algorithm designed to be computationally expensive to deter brute-force attacks. It incorporates a salt to protect against rainbow table attacks and a cost factor to scale with hardware improvements.
- What are salt rounds?
- Salt rounds (also called cost factor) control how computationally intensive the hash is. Each increment doubles the time required. 10–12 rounds is the standard recommendation for most applications.
- Can I reverse a bcrypt hash?
- No. Bcrypt is a one-way function — it is computationally infeasible to derive the original password from a hash. Verification works by re-hashing the candidate password and comparing the result.
- Is this tool safe to use?
- Yes, for testing purposes. Bcrypt generation runs entirely in your browser using the bcryptjs library. No password or hash is ever sent to any server. However, never use this tool to hash passwords you use in production with real user data — use your backend runtime directly.