Is Bcrypt reversible?

No, Bcrypt is a one-way cryptographic hash function. It is designed to be computationally impossible to reverse the hash back into the original plain-text password.

What is the ideal cost factor for 2024?

For most general-purpose applications, a cost factor of 10 to 12 is recommended. However, for high-security systems, 13 or 14 is preferred, provided the server can handle the increased CPU load.

Does Bcrypt handle salts automatically?

Yes, the Bcrypt algorithm generates a random salt and embeds it directly into the final hash string, allowing the verification function to extract it automatically.

What is the maximum password length for Bcrypt?

Bcrypt has a maximum input limit of 72 characters. Any characters beyond the 72nd are ignored. For longer passwords, it is common to pre-hash the input with SHA-256.

How is Bcrypt different from Argon2?

While both are adaptive, Argon2 is newer and provides better resistance against GPU/ASIC attacks by being 'memory-hard,' whereas Bcrypt is primarily CPU-intensive.

Bcrypt Generator & Validator Online (Free, Fast & Secure)

Bcrypt Hash Generator & Validator

Bcrypt is a password-hashing algorithm designed specifically for secure password storage. Unlike MD5 or SHA-256, bcrypt is intentionally slow and includes a built-in salt to prevent rainbow table and brute-force attacks. It is the recommended standard for password hashing in web applications.

What is Bcrypt?

Bcrypt produces a 60-character hash in the format: $2a$10$[22-char salt][31-char hash]. The $10$ is the cost factor (rounds) — each increment doubles computation time, making brute-force attacks exponentially harder as hardware improves.

Bcrypt Cost Factor Guide

Rounds 4: ~1ms — testing only, never use in production
Rounds 10: ~100ms — default, recommended for most applications
Rounds 12: ~400ms — recommended for high-security apps
Rounds 14: ~1.6s — very high security, may slow login UX

How to Use the Bcrypt Generator

Enter the password or string you want to hash in the Password field
Select the cost factor (rounds) with the slider — 10 is the recommended default
Click Generate Hash to compute the bcrypt hash
Copy the hash and store it in your database
To verify: enter the plaintext password and the stored hash in the Verify section and click Verify Match

Frequently Asked Questions

How do I generate a bcrypt hash online?

Enter your password, set the rounds (cost factor), and click Generate Hash. The hash is computed locally in your browser using bcryptjs — nothing is sent to a server.

What is the bcrypt cost factor?

The cost factor controls how many iterations bcrypt performs. Rounds=10 takes ~100ms, rounds=12 takes ~400ms. Higher rounds = more secure but slower login. Default of 10 is recommended for most web applications.

What does a bcrypt hash look like?

Example: $2a$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWy — $2a$ is the version, $10$ is the cost factor, followed by base-64 encoded salt and hash.

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Bcrypt Generator & Validator Online (Free, Fast & Secure) – DataMorph