Bcrypt generator

Free Bcrypt Generator Tool

The Bcrypt Generator creates secure, salted bcrypt hashes for passwords and secrets with an adjustable cost factor. It helps you strengthen password storage by making brute-force attacks slower and less effective. Use it when building login systems, testing authentication flows, or migrating from weaker hash algorithms.

What is Bcrypt Generator?

The Bcrypt Generator is an online tool that converts a password or string into a bcrypt hash. Bcrypt is a one-way, adaptive hashing algorithm that automatically incorporates a unique salt and a cost factor to slow down attackers. Unlike encryption, bcrypt hashes cannot be reversed to reveal the original input.

On Monkey Type, this tool streamlines password hashing for developers, security engineers, and QA teams. You can quickly generate a bcrypt hash that includes the algorithm identifier, cost, salt, and checksum in one compact string (for example, one starting with $2b$). This makes it straightforward to copy the result into application configs, seed scripts, or database records for testing.

Use the Bcrypt Generator when you need secure password storage, are standardizing on bcrypt for an application, or are evaluating alternatives like Argon2. If you are creating passwords first, consider pairing it with the Password Generator to produce strong, random inputs before hashing.

Why Use Bcrypt Generator?

• Harden password storage quickly: Problem: plain text or weak hashes (MD5/SHA‑1) are unsafe. Solution: generate a bcrypt hash with a proper cost factor to make offline cracking far more expensive.
• Control performance and security: Problem: hashing must be secure yet responsive. Solution: adjust the cost so user logins remain fast while attackers face exponential slowdowns.
• Simplify migrations: Problem: moving from legacy hashes to bcrypt is error-prone. Solution: produce standardized $2b$ hashes for seed users, admin accounts, or test fixtures to validate your migration path.
• Improve QA and debugging: Problem: hard-to-reproduce auth bugs. Solution: generate known bcrypt outputs for test suites and staging environments to verify authentication logic.
• Evaluate modern options: Problem: choosing a hashing algorithm. Solution: compare bcrypt outputs and cost to alternatives using the Argon2 Generator when deciding on Argon2id for new systems.

How to Use Bcrypt Generator on Monkey Type

1. Enter your input: Type or paste the password or secret you want to hash into the input field. For production, use a strong password (you can create one with the Password Generator).
2. Choose a cost factor: Select a cost (work factor), typically between 10 and 14 for server-side use. Higher costs increase security but take longer per hash.
3. Generate the hash: Click the Generate button. The tool will compute a bcrypt hash using a unique salt.
4. Copy the result: Copy the output string (it should start with $2b$, followed by the cost, salt, and hash). Store it where your application expects a bcrypt hash.
5. Verify in your app: Use your application’s bcrypt library to verify passwords against the stored hash. For related checks or pre-processing, you can also try the SHA-256 Generator or Base64 Encoder/Decoder where appropriate.

Expected result: You will see a string similar to $2b$12$abcdefghijklmnopqrstuvC9m2OpfX7oYp7Qm6l3Kc7T7h8kHk2QGq that embeds the cost, salt, and checksum.

Key Features

• Adaptive cost control: Tune the work factor to balance login performance with resistance to brute-force attacks.
• Secure salted hashes: Every output includes a cryptographic salt to prevent rainbow table attacks and ensure unique hashes for identical passwords.
• $2b$ compatibility: Outputs are formatted with the modern bcrypt identifier for broad framework support.
• Copy-ready output: Paste the generated hash directly into environment variables, seed files, or database records.
• Developer-friendly workflow: Combine with tools like the Random String Generator for test data and the UUID Generator for fixtures.

Best Practices & Tips

• Pick a cost that fits your hardware: Target 100–300 ms per hash on your servers. Start with cost 10–12 for most web apps, increasing as hardware improves.
• Never store plain text passwords: Always store only the bcrypt hash. Keep database backups encrypted, and restrict access.
• Mind the 72-byte limit: Bcrypt considers only the first 72 bytes of input. Use UTF‑8 and avoid extremely long passphrases. If you must support long inputs, consider pre-hashing with SHA‑256 then bcrypting that digest, and document the scheme clearly.
• Use per-user unique salts: Bcrypt embeds a unique salt automatically. Do not reuse salts or attempt to remove them.
• Consider a pepper: Optionally add a server-side secret (pepper) before hashing to mitigate database leaks. Store the pepper outside the database (e.g., in a KMS).
• Evaluate Argon2id for new builds: For modern defenses against GPU/ASIC cracking and better memory hardness, compare with the Argon2 Generator.

Common Use Cases

• Bootstrapping admin accounts: Generate a bcrypt hash for an initial admin password to insert into your production database during deployment.
• Test fixtures and CI: Create deterministic credentials for integration tests, then verify authentication logic in staging.
• Framework configuration: Populate environment variables or YAML/TOML configs with bcrypt hashes for services that support basic auth.
• Legacy migration: Transition from MD5/SHA‑1 by re-hashing on login or via a migration job, using the Bcrypt Generator to validate output formatting.
• Security reviews: Quickly sanity-check that a hash is in the correct $2b$ format and that the cost factor meets your policy.

Frequently Asked Questions

Is bcrypt reversible?

No. Bcrypt is a one-way hashing function. You cannot decrypt a bcrypt hash to recover the original password. Verification works by running bcrypt with the same parameters from the stored hash and comparing results.

What cost factor should I choose?

Pick the highest cost that keeps login operations responsive on your hardware. Many teams start with cost 10–12 for web apps. Measure hashing time in production-like conditions and revisit periodically as hardware improves.

Why do bcrypt hashes start with $2b$?

The prefix identifies the bcrypt version and format. $2b$ is the modern variant used by most libraries today, followed by the two-digit cost, a 22-character salt, and the checksum. Applications use this metadata to verify passwords correctly.

Does bcrypt have a maximum password length?

Yes. Bcrypt processes only the first 72 bytes of the input. Use UTF‑8 encoding and avoid overly long passphrases. If you must support longer inputs, consider pre-hashing with the SHA-256 Generator and then hashing that digest with bcrypt (document this design clearly).

Is bcrypt still recommended, or should I use Argon2?

Bcrypt remains widely trusted and supported. For new systems, many experts recommend Argon2id due to memory hardness and modern design. You can evaluate both using Monkey Type’s Argon2 Generator and choose based on your threat model and performance targets.