What is Bcrypt Generator
The Bcrypt Generator creates bcrypt password hashes directly in your browser. Bcrypt is a key derivation function designed specifically for password hashing — it applies the Blowfish cipher with a configurable cost factor (work factor) that determines how computationally expensive each hash computation is. The default cost factor of 10 means each hash requires 2^10 (1024) rounds of key setup, making brute-force attacks significantly slower than with fast hash functions like MD5 or SHA-256.
The output is a standard bcrypt hash string in the format $2b$cost$salt+hash, which is compatible with bcrypt libraries in Node.js, Python, Ruby, PHP, Go, and virtually every server-side language. The salt is generated automatically using the Web Crypto API's random number generator, ensuring each hash is unique even for identical passwords.
How to Use Bcrypt Generator
- Enter the password you want to hash in the input panel. This is the plain-text password that would be stored in a user's browser or entered during registration.
- Adjust the cost factor if needed. The default of 10 is appropriate for most web applications. Increase to 12-14 for high-security systems (slower hashing but harder to brute-force). Decrease to 8-9 only for development/testing where speed matters more than security.
- Read the output hash — a 60-character string starting with
$2b$. This is what you store in your database. Never store the plain-text password. - Copy the hash using the copy button. Paste it into your database migration, user creation script, or password update query.
Why Use Bcrypt Generator
Bcrypt is the industry standard for password storage in web applications. Unlike raw hash functions, bcrypt includes a built-in salt (preventing rainbow table attacks) and an adjustable cost factor (allowing you to increase computational expense as hardware gets faster). Major frameworks — Django, Rails, Laravel, Express — all use bcrypt or its close cousin scrypt as their default password hashing scheme.
This browser-based generator is useful for testing password hashing workflows without setting up a server, migrating existing password databases where you need to generate hashes for a batch of users, and verifying that your application's bcrypt configuration produces compatible hash strings. It is also valuable for security demonstrations — showing stakeholders why bcrypt is slow by design, and why that slowness is a feature, not a bug.
Privacy & Security
This tool runs entirely in your browser — no data ever leaves your device. There is no server round-trip, no upload, no logging, and no account required. Your input is processed locally using client-side JavaScript and is never stored, transmitted, or accessible to anyone else. When you close the tab, everything disappears.
Frequently Asked Questions
What cost factor should I use?
For production web applications, cost factor 10-12 is the standard range. Cost 10 takes roughly 100ms on modern hardware, which is fast enough for login flows but slow enough to deter brute-force attacks. Cost 12 takes roughly 400ms — use it for high-value accounts (admin panels, financial systems). Cost 14+ takes several seconds and is typically reserved for offline hashing (like background job processors). The key insight: bcrypt's slowness is intentional — it makes each guess expensive for an attacker.
Is bcrypt still considered secure?
Yes. Bcrypt remains one of the two recommended password hashing algorithms (alongside Argon2, which won the Password Hashing Competition in 2015). Bcrypt has no known practical attacks when used with an adequate cost factor. Its main limitation is a 72-byte password truncation — passwords longer than 72 bytes are silently truncated. For most use cases, this is not an issue since strong passwords rarely exceed 72 characters.
Can I verify a password against a bcrypt hash?
This tool generates hashes only. To verify a password against an existing bcrypt hash, use your application's bcrypt library (e.g., bcrypt.compare(password, hash) in Node.js). The verification function extracts the salt from the stored hash, re-hashes the candidate password with that salt, and compares the results. The Hash Comparison Tool in this domain can also help with constant-time comparison workflows.