About Bcrypt & Argon2 Hash Generator
Bcrypt and Argon2 are the industry-standard algorithms for securely hashing passwords. Unlike fast hashes (MD5, SHA), these algorithms are intentionally slow and include salt, making brute-force attacks impractical. This tool lets you generate password hashes and verify passwords against existing hashes. Use it to test your authentication logic or generate hashes for database seeding.
How to Use
- Enter the password to hash.
- Select the algorithm: bcrypt or Argon2id.
- Click "Hash" to generate the password hash.
- To verify, enter a password and an existing hash, then click "Verify".
Key Features
- ✓ Generate bcrypt password hashes
- ✓ Generate Argon2id password hashes
- ✓ Verify passwords against existing hashes
- ✓ Automatic salt generation
Common Use Cases
- • Generating password hashes for database seeding
- • Testing authentication and login flows
- • Verifying stored password hashes
- • Learning about password hashing algorithms
Frequently Asked Questions
What is bcrypt?
Bcrypt is a password hashing algorithm based on the Blowfish cipher. It incorporates a salt and a configurable cost factor that makes it intentionally slow, protecting against brute-force attacks.
What is the difference between bcrypt and Argon2?
Argon2 (specifically Argon2id) is newer and considered more resistant to GPU-based attacks because it requires significant memory. Bcrypt is well-established and widely supported. Both are excellent choices.
Why not use SHA-256 for passwords?
SHA-256 is too fast — attackers can test billions of hashes per second on modern GPUs. Bcrypt and Argon2 are designed to be slow, making brute-force attacks impractical.
Are the generated hashes safe for production?
Yes. The generated hashes use proper salts and cost factors. However, always hash passwords server-side in your application rather than using an external tool for production passwords.