bcrypt Generator
Generate bcrypt hashes and verify passwords against existing hashes — all in your browser using bcryptjs. Configurable cost factor (rounds) so you can benchmark different strengths.
About bcrypt Generator
bcrypt has been the industry-standard password hashing function for over 20 years — designed to be slow enough that brute-force cracking is impractical, and to remain resistant as hardware gets faster (you just bump the cost factor). This bcrypt Generator has two modes. Generate mode takes a plaintext password and produces a bcrypt hash with a configurable cost factor (rounds). Verify mode takes a plaintext password AND an existing bcrypt hash and tells you whether they match — the operation your login endpoint runs on every sign-in.
Cost factor 10 was the standard for years; 12 is the modern recommendation as of 2026 given faster GPUs; 14 is aggressive and takes several seconds per hash even on modern hardware. Each increment doubles compute time. The tool runs the bcryptjs library entirely in your browser — no network calls, no logging, no storage. Useful for developers testing password hashing in their app locally, debugging authentication flows, generating admin passwords for seeding scripts, and understanding how bcrypt's cost factor affects real-world speed. Includes a breakdown of the hash format so you can see the algorithm identifier, cost, salt, and hash portions separately.
How to Use
Choose Generate mode to create a bcrypt hash from a plaintext password.
Set the cost factor (rounds) — 10-12 is the modern standard. Higher = more secure but slower to compute.
Click Generate. The hash appears with the salt embedded (bcrypt format includes salt and cost in the string).
Choose Verify mode to check whether a password matches an existing bcrypt hash — paste both and hit Verify.
Frequently Asked Questions
Why is my bcrypt hash different every time even for the same password?
bcrypt generates a random salt for each hash. That is by design — it means two users with the same password get different hashes, so an attacker can't precompute a rainbow table. Verification still works because the salt is embedded in the hash itself.
What cost factor (rounds) should I use?
10 was the standard for years. 12 is the modern recommendation as of 2026 given faster hardware. 14 is highly secure but takes 500-1000ms per hash — noticeable on every login. Every +1 to the cost factor doubles compute time. Pick the highest number where your login flow stays under 300ms on your production server.
Is bcrypt still secure in 2026?
Yes for most applications. Argon2id is theoretically stronger against GPU attacks and is the OWASP first choice, but bcrypt remains widely supported and secure for typical web applications. If you are choosing today with no legacy constraints, argon2id is the winner. If you are already on bcrypt with cost 10+, staying on bcrypt is fine.
Can I recover the original password from a bcrypt hash?
No — bcrypt is a one-way function. You can only verify by re-hashing a candidate password and comparing to the stored hash. If a user forgets their password, you must send them a reset flow (email link that lets them set a new password), never their original.
Is my password sent to your server?
No. The bcryptjs library runs entirely in your browser. Generation and verification both happen locally — open the network tab to confirm zero outbound requests during hashing. Safe to test real passwords against real hashes for debugging.
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