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Generate bcrypt password hashes with customizable cost factors (rounds), automatic salt generation, and support for all bcrypt variants ($2a$, $2b$, $2y$). Perfect for secure password storage in applications and databases.
Note: AI can make mistakes, so please double-check it.
Higher rounds increase security but take longer to compute.
Enter password and hash to verify...
Common questions about this tool
Bcrypt is a password hashing algorithm designed for secure password storage. It automatically generates salts, uses adaptive cost factors to slow down hashing (preventing brute-force attacks), and is widely trusted for password security in applications.
Use cost factor 10-12 for most applications (balance between security and performance). Cost factor 10 takes ~100ms, factor 12 takes ~400ms. Higher costs are more secure but slower. Adjust based on your security requirements and server capacity.
$2a$ is the original bcrypt. $2b$ fixed a bug in handling certain characters. $2y$ is PHP-compatible. All variants are secure, but $2b$ is recommended for new applications. The generator supports all variants for compatibility.
Bcrypt is specifically designed for passwords and is slower than other hashes. For non-password data (file integrity, checksums), use faster algorithms like SHA-256. Bcrypt's slowness is a security feature for passwords.
Store the complete bcrypt hash string (including $2a$, $2b$, or $2y$ prefix, cost factor, salt, and hash) in a VARCHAR(60) column. The hash is self-contained with all necessary information for verification, so you don't need to store the salt separately.
Learn what this tool does, when to use it, and how it fits into your workflow.
The Bcrypt Generator creates bcrypt password hashes directly in your browser. It lets you enter a password, choose a cost factor (rounds) using clear presets, and automatically generates a bcrypt hash using a cryptographic library.
Bcrypt hashes are the standard way to store passwords securely in many applications and databases. They are slow by design and use salts, which makes brute-force and rainbow table attacks much harder. However, generating bcrypt hashes by hand or from scripts can be inconvenient when you just want to test a configuration, bootstrap admin users, or inspect how changing the cost factor affects the hash.
This tool solves those problems. It offers a responsive user interface where you can type a password, pick a security level, and see a valid bcrypt hash appear. The hash uses a randomly generated salt and your chosen number of rounds. The tool also includes a built-in verifier panel and an optional AI-based security assessment for your choices.
The Bcrypt Generator is intended for backend developers, DevOps engineers, security specialists, and technical users who manage password storage. It is also accessible to motivated beginners who are learning about password hashing.
Bcrypt is a password hashing function built on top of the Blowfish cipher. Its main goal is to slow down attacks on hashed passwords by doing many rounds of processing controlled by a cost factor. The higher the cost, the more CPU time each hash requires. This means that attackers must spend more time and resources to guess passwords. A related operation involves verifying bcrypt hashes as part of a similar workflow.
A typical bcrypt hash string has this structure: $2b$12$[22-character-salt][31-character-hash]. The identifier $2b$ indicates the variant. The number 12 after the second dollar sign is the cost factor (also written as rounds or log2 of the iteration count). The last segment encodes both the salt and the hash using a custom 64-character alphabet.
When you store passwords, you should never store them in clear text or with fast hashes like plain SHA-256. Instead, you use bcrypt (or similar functions) to turn the password into a hash string. To verify a password later, you feed the password and stored hash into the bcrypt library. It recovers the cost and salt from the hash, runs the algorithm, and checks whether the resulting hash matches the one you stored.
The Bcrypt Generator in this project wraps these ideas into a generator and verifier interface. It dynamically loads a bcrypt implementation from the browser environment or from a bundled bcryptjs library, checks for valid inputs, and uses asynchronous calls to generate hashes so the page stays responsive.
2^{rounds} to remind you that work grows exponentially.window.bcrypt instance. If it cannot find one, it imports bcryptjs dynamically and stores it for reuse. Errors during loading are caught and shown to the user.$2a$, $2b$, or $2y$ and that its length and structure look like a bcrypt hash before trying to verify it.Bootstrapping admin accounts: When you create an initial administrator account for a new system, you can use this tool to generate a bcrypt hash for a chosen password and paste it into your database seeding scripts. For adjacent tasks, generating SHA-512 hashes addresses a complementary step.
Testing different cost factors: You can try hashing the same password with different security levels and observe how long each takes, helping you decide on an appropriate cost for your environment.
Verifying implementation behavior: If you are unsure whether your own code correctly hashes and verifies passwords, you can generate a hash here and test it with your application, or take a hash from your app and verify it in this tool.
Training and demos: Security trainers can show how bcrypt hashes look, how cost affects them, and how verification works, using the generator and verifier panels side by side.
Sanity-checking existing hashes: When working with an existing user database, you can take a sample hash, paste it into the verifier, and confirm its format and behavior before performing migrations. When working with related formats, generating SHA-256 hashes can be a useful part of the process.
2^{rounds}.The generator’s core function first checks whether the password is empty. If it is, it clears the current hash and stored password and returns early. It then confirms that the password length stays within the 1,000-character limit and that the chosen cost factor falls between 4 and 31.
To compute a hash, the function calls the bcrypt loader, which either returns an existing browser bcrypt implementation or imports bcryptjs. With the library in hand, the code uses its asynchronous genSalt and hash functions wrapped in a Promise. It generates a salt with the requested rounds, then hashes the password with that salt. On success, it saves the resulting hash and remembers the associated password as the last password used.
The verifier section uses a similar loading approach. It validates the test password and hash lengths, checks that the hash matches a basic prefix and pattern for bcrypt, and then runs compare via a Promise wrapper. This asynchronous comparison ensures the UI does not freeze while verifying longer hashes.
Both generator and verifier share debounce logic. The generator auto-hashes after a short delay when you type, while the verifier auto-checks after you change the password or hash. These delays reduce redundant computations while keeping output nearly real-time. In some workflows, identifying hash types is a relevant follow-up operation.
The AI security component calls a backend helper with the chosen number of rounds and password length. The backend uses those inputs to produce a short analysis string, which the tool displays as a security assessment. If anything goes wrong during this call, the component shows a clear fallback error.
| Preset | Rounds value | Relative security |
|---|---|---|
| Fast | 10 | Lower security, faster hashing |
| Balanced | 12 | Good balance for many applications |
| Secure | 14 | Higher security, slower hashing |
Choose rounds based on your environment: Test your chosen cost factor on production-like hardware and pick a value that keeps login latency acceptable while still adding good resistance to brute-force attacks.
Never store plain passwords: Always store only the full bcrypt hash string, not the password itself. The hash already holds the salt and cost, so you do not need to store those separately.
Avoid low cost factors for new systems: Values below 10 may be too fast on modern hardware, reducing bcrypt’s security benefit. Use at least the Balanced preset unless you have very specific constraints. For related processing needs, generating HMAC signatures handles a complementary task.
Protect generated hashes: Even though bcrypt hashes are opaque, treat them as sensitive information. If leaked, attackers can still attempt offline attacks over time.
Use the verifier to cross-check behavior: After generating a hash here, verify it both in this tool and in your own application to confirm that your bcrypt library behaves as expected.
Monitor error messages: If the tool reports that the bcrypt library cannot load, you may be in an unsupported environment. Try again in a modern browser or refresh the page.
Do not share production passwords in demos: When showing this tool to others or streaming your screen, use only test passwords and temporary hashes.
Plan for future increases in rounds: Hardware gets faster over time. Review your chosen cost factor periodically and consider raising it for new hashes as systems evolve.
Treat AI guidance as advisory: Use the AI analysis to highlight possible weak spots in your configuration, but always confirm changes with your security team and real performance tests.
Document your hashing policy: Record which variants and cost factors you use so that future migrations, audits, and troubleshooting are easier and less error-prone.
We’ll add articles and guides here soon. Check back for tips and best practices.
Summary: Generate bcrypt password hashes with customizable cost factors (rounds), automatic salt generation, and support for all bcrypt variants ($2a$, $2b$, $2y$). Perfect for secure password storage in applications and databases.