About the Bcrypt Generator
bcrypt is the battle-tested password hashing algorithm: deliberately slow, salted by design, and tunable via its cost factor so it stays expensive as hardware gets faster. This tool generates bcrypt hashes and verifies passwords against existing hashes, entirely in your browser using a pure JavaScript implementation.
Typical uses: generating a hash to seed a database fixture or htpasswd-style config, verifying which password matches a hash pulled from a legacy system, and demonstrating how the cost factor changes computation time before you pick one for production.
Frequently asked questions
What cost factor should I use?
The standard guidance is the highest cost your login latency budget tolerates — commonly 10–12 today. Each increment doubles the work: cost 10 is ~100ms on typical server hardware, cost 12 ~400ms. Benchmark on your actual production hardware, since the right value changes as CPUs improve.
Why does the same password produce a different hash every time?
bcrypt embeds a random 16-byte salt in every hash — that's the $...$ segment after the cost. Verification extracts the salt from the stored hash and re-hashes the candidate password with it. This is correct behavior: identical hashes for identical passwords would leak which users share passwords.
Is bcrypt still a good choice versus Argon2?
Yes. Argon2id is the current OWASP first recommendation because it also hardens against GPU/ASIC attacks via memory cost, but bcrypt with cost ≥10 remains explicitly acceptable and has decades of production hardening. The real failures are fast hashes (SHA-256, MD5) or no salt — not bcrypt vs Argon2. Note bcrypt truncates passwords at 72 bytes.
Need this managed for you, not just automated?
We're also a hands-on DevOps consultancy — Kubernetes, CI/CD, and cloud infrastructure.