Higher values are more secure but slower (recommended: 10-12)
Generated Bcrypt Hash
Free Bcrypt Hash Generator & Verifier
Hash and verify passwords using the industry-standard bcrypt algorithm
Our free Bcrypt Hash Generator creates secure password hashes using the bcrypt algorithm — the industry standard for password hashing. Bcrypt incorporates a salt and configurable cost factor to protect against brute-force attacks. Generate hashes, verify passwords against existing hashes, and configure the work factor for your security requirements — all processed entirely in your browser for complete privacy.
🔒 What is Bcrypt?
Bcrypt is an adaptive password hashing function designed by Niels Provos and David Mazières in 1999, based on the Blowfish cipher. Unlike fast hash functions like MD5 or SHA-256, bcrypt is intentionally slow — it incorporates a work factor (cost) that determines how computationally expensive the hashing process is. This makes brute-force attacks exponentially harder. Bcrypt also automatically generates and embeds a random salt in each hash, preventing rainbow table attacks. The output format is $2a$[cost]$[22-char salt][31-char hash].
🛠️ How to Use Bcrypt Hash Generator
- 1 Switch between 'Generate Hash' and 'Verify Hash' tabs depending on your task.
- 2 To generate: Enter the password you want to hash in the input field.
- 3 Adjust the cost factor (4-14) — higher values are more secure but take longer. 10-12 is recommended for most applications.
- 4 Click 'Generate Bcrypt Hash' to create the hash. The 60-character bcrypt output includes the algorithm version, cost, salt, and hash.
- 5 To verify: Enter the original password and the bcrypt hash, then click 'Verify Password' to check if they match.
✨ Key Features
Industry-Standard Security
Bcrypt is recommended by OWASP and used by major platforms like Ruby on Rails, Django, and Spring Security for password storage.
Configurable Cost Factor
Adjust the work factor from 4 to 14 rounds. Each increment doubles the computation time, letting you balance security and performance.
Password Verification
Verify passwords against existing bcrypt hashes — perfect for testing login systems, validating stored hashes, and debugging authentication.
🎯 Common Use Cases
🗄️ Password Storage
Generate bcrypt hashes for storing user passwords in databases. Bcrypt is the recommended algorithm for password hashing in web applications, providing built-in salt and adaptive cost.
🧪 Authentication Testing
Test password verification logic in your authentication system. Generate known hashes and verify they match expected passwords during development and QA testing.
🔄 Hash Migration
Migrate from insecure hashing algorithms (MD5, SHA-1) to bcrypt. Generate bcrypt hashes for existing passwords during a database migration to improve security.
🔍 Security Auditing
Audit password security practices by testing different cost factors. Understand how bcrypt's adaptive cost impacts hashing time and resistance to brute-force attacks.
💡 Bcrypt Best Practices
- Use a cost factor of 10-12 for most web applications — this provides strong security with acceptable hashing time (100-400ms).
- Never store passwords in plain text or using fast hash functions like MD5, SHA-1, or SHA-256 without key stretching.
- Increase the cost factor periodically as hardware improves — bcrypt's adaptive cost is designed for this.
- Always use bcrypt's built-in salt — never create your own salting mechanism on top of bcrypt.
- Hash passwords server-side, not client-side. Client-side hashing can be bypassed and doesn't replace server-side security.
- Implement rate limiting on login endpoints to complement bcrypt's brute-force protection.
❓ Frequently Asked Questions
Why is bcrypt better than MD5 or SHA-256 for passwords?
MD5 and SHA-256 are designed to be fast — they can hash billions of passwords per second on modern GPUs, making brute-force attacks trivial. Bcrypt is intentionally slow with its configurable cost factor, making each hash attempt take hundreds of milliseconds. This makes brute-force attacks millions of times slower and impractical for attackers.
What cost factor should I use?
A cost factor of 10 is the default and suitable for most applications (approximately 100ms per hash). For high-security applications, use 12 (approximately 400ms). Cost factors above 14 may cause noticeable delays in user experience. Benchmark on your actual server hardware to find the right balance.
Is my password safe using this tool?
Yes. All hashing and verification happens entirely in your browser using the bcryptjs library. Your password is never sent to our servers. However, for production applications, always hash passwords server-side where the process is more secure.
Why does bcrypt always generate a different hash for the same password?
Bcrypt automatically generates a random 16-byte salt for each hash. This means the same password produces a different hash every time. The salt is embedded in the hash output, so bcrypt can extract it during verification. This prevents rainbow table attacks and ensures identical passwords have different hashes in your database.
Can bcrypt hashes be decoded/reversed?
No. Bcrypt is a one-way hashing function — there is no mathematical way to reverse a bcrypt hash back to the original password. The only way to 'crack' a bcrypt hash is by brute-force or dictionary attacks, which bcrypt's slow hashing makes extremely time-consuming and impractical.