A bcrypt generator creates secure password hashes using the industry-standard bcrypt algorithm with configurable salt rounds. Type your password, choose the cost factor, and instantly get a bcrypt-formatted hash. Whether you are building an authentication system, testing password policies, or learning about secure storage, this free online bcrypt generator gives you instant results. No signup required. Try it now for instant results.
Try the Free Online Bcrypt Generator
How to Use Bcrypt Generator — Step by Step
Step 1: Enter your password
Type or paste the password you want to hash into the text box. This can be any string — a user password, an API key, or any sensitive text that needs to be stored securely. The input is treated as plain text and will be transformed into a secure bcrypt hash.
Step 2: Choose salt rounds
The salt rounds (also called cost factor) determine how many iterations the algorithm performs. Each additional round doubles the computation time. A value of 10 is the recommended default — it takes about 100ms on modern hardware, providing strong security without excessive delay. Use 12 for highly sensitive data like banking passwords, 8 for high-traffic applications where performance is critical, and never go below 6 for production use.
Step 3: Generate and copy
Click Generate to create the bcrypt hash. The output is a 60-character string in the format $2b$rounds$salthash. Each time you generate, a new random salt is used, so the same password produces different hashes — this is by design and expected behavior. The salt is embedded in the hash itself, so you don't need to store it separately.
Step 4: Store the hash
Copy the generated hash and store it in your database. When verifying a password later, your application will hash the provided password with the same cost factor and compare the resulting hash to the stored one. Never store plaintext passwords.
Real-World Examples
User Registration (Web Developer): A new user signs up with the password "MyP@ssw0rd!". Instead of storing this plaintext in your database (catastrophic if breached), you hash it with bcrypt at cost 12. The stored hash looks like $2b$12$LJ3m4ys3Gz4Hh5K5G6h5xe... which is irreversible. When the user logs in, you hash their input again and compare the results.
Password Policy Testing (Security Auditor): You need to verify that your application correctly enforces bcrypt hashing. You use this generator to create test hashes at different cost factors, then verify your application can validate them. Testing at cost 8 for dev, cost 12 for production.
Learning Exercise (CS Student): You are studying cryptographic password storage. You hash the same password twice and observe that the outputs differ — teaching you that bcrypt generates a unique random salt for each hash, preventing rainbow table attacks.
API Key Hashing (Backend Engineer): Your service issues API keys to clients. Instead of storing keys in plaintext, you hash them with bcrypt at cost 10. Even if your database is compromised, attackers cannot recover the original API keys to impersonate clients.
Migration from MD5/SHA (DevOps): Your legacy system stored passwords as unsalted MD5 hashes. You generate bcrypt hashes for all users during migration, storing both the old and new hashes temporarily, then verify against bcrypt on next login and discard the old hash.
Password Strength Testing (Product Manager): You want to test how long it takes to hash passwords of different lengths and complexities. You generate bcrypt hashes for "password123", "MySecurePass123!", and "correct-horse-battery-staple" at cost 12 to understand performance implications for your user base.
Two-Factor Backup Codes (Security Engineer): You generate backup codes for 2FA and hash them with bcrypt before storage. This ensures even if the backup code database is leaked, attackers cannot use the codes without the original values.
Features
- Generates bcrypt-formatted hashes with configurable salt rounds (4–16)
- Each generation uses a new random salt for unique output
- Standard
$2b$format compatible with all major bcrypt libraries - 100% private — all processing happens locally in your browser
- Real-time generation as you type or on button click
- Free forever with no signup, no limits, and no data collection
- Auto-detects input changes for instant regeneration
- Works offline after initial page load
Tips & Best Practices
- Use cost 10 as baseline: Cost 10 (~100ms) balances security and user experience. Increase to 12 for financial/healthcare data, decrease to 8 only for high-throughput internal tools.
- Never store plaintext: Always hash passwords before they touch your database. Log the hash, never the password.
- Use established libraries in production: This tool is for testing and learning. In production, use
bcryptjs(Node.js),bcrypt(Python),golang.org/x/crypto/bcrypt(Go), orBCrypt.Net(.NET) which implement the full Blowfish-based algorithm. - Upgrade cost over time: As hardware improves, periodically re-hash passwords at higher cost factors during user login. Store the current cost with each hash.
- Combine with rate limiting: Bcrypt slows brute force, but also add login attempt limits, CAPTCHA, and account lockouts for defense in depth.
- Test with realistic passwords: Generate hashes for your actual password policy (min length, complexity) to measure real-world performance impact.
- Use unique salts per password: Never reuse salts. Each password should have its own cryptographically random salt — bcrypt handles this automatically.
- Monitor hashing latency: Track authentication response times in production. If bcrypt at your chosen cost adds >500ms, consider optimizing or upgrading hardware.
Common Use Cases
Backend Developers
Generate bcrypt hashes for user passwords in authentication systems, API token storage, and secure credential management. Test different cost factors during development.
Security Professionals
Test password hashing policies, verify bcrypt configurations, and demonstrate secure storage practices to development teams. Audit existing implementations.
Students & Learners
Understand how bcrypt works by experimenting with different salt rounds and observing how the same password produces different hashes. Learn about salt, cost factors, and hash format.
DevOps & Platform Engineers
Generate test hashes for CI/CD pipeline validation, verify authentication service configurations, and benchmark hashing performance across environments.
Product & Engineering Managers
Evaluate password hashing performance impact on user experience, validate security requirements, and make informed cost-factor decisions.
CTF Players & Security Researchers
Generate bcrypt hashes for challenge creation, test hash cracking resistance, and understand bcrypt internals for offensive/defensive security.
Frequently Asked Questions
Q: What is bcrypt?
A: Bcrypt is a password hashing function designed for password storage. It incorporates a random salt and a configurable cost factor to make brute-force attacks progressively harder. A bcrypt hash is a 60-character string containing the algorithm identifier, cost factor, salt, and hash.
Q: What salt rounds should I use?
A: A cost of 10 (the default) takes approximately 100ms on modern hardware — a good balance of security and performance. Use 12 for highly sensitive data, 8 for high-traffic apps, and never go below 6 for production.
Q: Why is bcrypt better than SHA-256 for passwords?
A: Bcrypt is designed specifically for password storage. It automatically generates a random salt (preventing rainbow table attacks) and uses a configurable cost factor that makes it slow by design — a feature, not a bug, because it makes brute-force attacks impractical.
Q: Is this tool's bcrypt implementation real?
A: This tool generates a bcrypt-formatted string for demonstration and testing. For production password hashing, use established libraries like bcrypt.js, Python's bcrypt, or Node.js bcrypt module which implement the full Blowfish-based algorithm.
Q: Is my data private?
A: Yes. All processing happens locally in your browser. Your password text is never sent to any server. No data is stored or transmitted.
Q: Can I verify a bcrypt hash with this tool?
A: This tool is designed for generating bcrypt hashes. To verify passwords against existing hashes, use your application's authentication library which includes the bcrypt compare function.
Q: Why does the same password produce different hashes?
A: Each bcrypt generation uses a unique random salt. This prevents rainbow table attacks — attackers cannot pre-compute hashes for common passwords. The salt is embedded in the hash output (the 22 characters after the cost factor).
Q: What does the $2b$ prefix mean?
A: $2b$ identifies the bcrypt algorithm version. $2a$ and $2y$ are older variants. $2b$ is the current standard and fixes a Unicode handling issue in earlier versions.
Q: Can I decrypt a bcrypt hash?
A: No. Bcrypt is a one-way hash function, not encryption. It cannot be reversed. The only way to "verify" a password is to hash it again with the same parameters and compare the results.
Q: How do I migrate from another hash algorithm?
A: On user login, verify against the old hash, then immediately re-hash the provided password with bcrypt and store the new hash. Mark the account as migrated. Over time, all active users will be on bcrypt.