What is Bcrypt Hash Generator?

Creates secure, salted password hashes using the bcrypt algorithm. Hash passwords for database storage or verify existing hashes against plaintext.

Bcrypt is the password-hashing algorithm behind countless production auth systems. Each hash bakes in its own random salt, so identical passwords never produce identical hashes. The cost factor (4–18) doubles the work per step, letting you slow brute-force attempts to a crawl while keeping login latency reasonable.

How to use

1. Enter the password or string you want to hash and select a cost factor (salt rounds) between 4 and 18.
2. Click generate to create the bcrypt hash. Higher cost factors produce stronger hashes but take longer to compute.
3. Copy the generated hash for use in your application, or use the verify tab to check a password against an existing hash.

When to use

• Hashing new user passwords before writing them to your database.
• Reproducing or testing a login flow against an existing $2b$ hash.
• Picking a cost factor by measuring hash time on your target hardware.

Result

A backend developer needs to store a user password securely. They enter 'MySecurePass123' with 12 salt rounds and get a $2b$ hash string to store in their PostgreSQL database.

FAQ

What cost factor should I pick for production?

On modern server hardware, 12 is a common floor and 14 is becoming standard. Aim for a hash time of 200–500 ms per login. Anything under 100 ms is too cheap; anything over a second will frustrate users with slow devices.

Why do I get a different hash each time for the same password?

Bcrypt generates a fresh 16-byte salt on every call and embeds it into the hash string itself. That's the whole point: two users with the password 'letmein' end up with completely different hashes, so a leaked database can't be cracked with a single rainbow table.

Is there a maximum password length I should worry about?

Bcrypt silently truncates inputs after 72 bytes. If you accept passphrases longer than that, pre-hash with SHA-256 first and then pass the digest to bcrypt. Most apps cap user input at 64–72 characters and call it a day.

Can I verify a hash that was generated by another bcrypt library?

Yes. The $2a$, $2b$, and $2y$ prefixes are interoperable across PHP, Node, Python, Ruby, Go, and Java implementations. Paste a hash from any of them into the verify tab and it should match the original password.

Should I still use bcrypt in 2026 or switch to argon2?

Argon2id is the modern recommendation, but bcrypt is still considered safe and is supported everywhere. If you're maintaining a system that already uses bcrypt, there's no urgent reason to migrate. Pick argon2 for greenfield projects.

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