8 Best bcrypt Password Generator Tools for Secure Hashing

Have you ever wondered how top websites keep your passwords safe even if their databases get hacked? If you’ve searched for a best bcrypt password generator tools, you’re on the right track. bcrypt is an adaptive, salted hashing function designed to withstand brute-force and rainbow-table attacks by increasing its workload over time. In this guide, you’ll discover:

• What bcrypt is and how it secures passwords

• Step-by-step instructions for creating and checking bcrypt hashes

• Eight of the best online bcrypt password generator tools

• Security considerations, known weaknesses, and why bcrypt still rules

By the end, you’ll be fully equipped to implement bcrypt in your projects and choose the right tool for your workflow.

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What Is the bcrypt Algorithm for Passwords?

bcrypt is a password-hashing function developed in 1999 by Niels Provos and David Mazières, based on the Blowfish cipher. It combines a random salt with your password, then runs an expensive key schedule—repeatedly rekeying the cipher—to generate a 192-bit hash. The cost parameter (typically 10–14) controls 2ʰᵉᵒᵖᵉʳᵃᵗᶦᵒⁿˢ, making bcrypt adaptable as hardware speeds up over time.

How bcrypt Works

1. Salt Generation: A 128-bit random salt is created.

2. Cost Factor: You select a cost (e.g., 12 → 2¹² = 4,096 rounds).

3. EksBlowfishSetup: The “expensive key schedule” mixes password and salt into subkeys.

4. Repeated Encryption: A fixed string (“OrpheanBeholderScryDoubt”) is encrypted 64 times.

5. Hash Output: The result is formatted as $2b$<cost>$<22-char salt><31-char hash>.

How to Create a bcrypt Password

Creating a bcrypt hash can be done in code or via an online tool. Here’s a quick CLI example using Node.js’s bcrypt module:

bash

npm install bcrypt

javascript

const bcrypt = require(‘bcrypt’);
const password = ‘MyS3cret!’;
const cost = 12;

bcrypt.genSalt(cost, (err, salt) => {
bcrypt.hash(password, salt, (err, hash) => {
console.log(‘bcrypt hash →’, hash);
});
});

Steps Explained:

1. Install your language’s bcrypt library.

2. Choose a cost factor (10–14 recommended).

3. Generate a salt, then hash your password.

4. Store the full bcrypt string ($2b$12$...) in your database

Best bcrypt Password Generator Tools

Below are eight of the best free online bcrypt password generator tools, each with unique features to suit different workflows:

1. BulkBcrypt

   • Use case: Bulk-hash dozens or hundreds of passwords at once, one per line.

   • Features: Paste multiple plaintext passwords, choose a cost factor, and instantly get a list of corresponding bcrypt hashes. Ideal for seeding test databases or migrating legacy credentials in bulk. (bulkbcrypt.com)

2. DevGlan Online Bcrypt Hash Generator

   • Use case: Quick generate & verify with a clean, developer-friendly interface.

   • Features:

     • Two modes: Generate a hash with selectable salt rounds (defaults to 10) or Match a plaintext against a bcrypt hash.

     • All processing is client-side over HTTPS—nothing is stored on their servers.

     • Simple donate option if you appreciate the tool. (devglan)

3. bcryptcalculator.com

   • Use case: Minimal-distraction hash generation.

   • Features:

     • Enter a password, select cost (log rounds), and view the resulting hash.

     • Copy one-click output, powered by Luv2Code’s implementation.

     • No verification mode; focused purely on hash creation. (bcryptcalculator.com)

4. AppDevTools Bcrypt Generator / Checker

   • Use case: Integrated tool among dozens of developer utilities.

   • Features:

     • Split UI: Generator for creating hashes, Checker for verifying them.

     • Supports salt rounds from 4 to 16.

     • Instant copy to clipboard, clear/reset buttons, and client-side security.

     • Part of a larger suite of converters and cryptography tools. (appdevtools.com)

5. Toptal Bcrypt API

   • Use case: Automated test suites and CI/CD pipelines.

   • Features:

     • REST endpoints for generate-hash and check-password, accepting POST data.

     • Cost parameter limited to 4–10 for predictable performance.

     • Returns JSON with the original password, hash, and cost—perfect for external verification in integration tests. (TalentConnect)

6. Toolkit.dev Bcrypt Hash Generator and Checker

   • Use case: Custom salt and variant support.

   • Features:

     • Choose the log rounds, bcrypt prefix (2a or 2b), and supply your own salt.

     • Verification mode to compare plaintext and hash.

     • Emphasizes the irreversibility of bcrypt while offering full testability. (bcrypthashgenerator.tool-kit.dev)

7. bcrypt.online

   • Use case: Mobile-friendly UI with extensive cost options.

   • Features:

     • Cost factor slider from 4 up to 19, letting you stress-test different performance/security trade-offs.

     • Separate Generate and Verify tabs.

     • Includes a brief guide on choosing the right cost factor and recommended password best practices. (bcrypt.online)

8. Browserling Bcrypt Tool

   • Use case: Super-lightweight for on-the-fly development and testing.

   • Features:

     • “Press a button — get a bcrypt.” No ads, no tracking, just immediate hash output.

     • Slim interface optimized for cross-browser testing scenarios.

     • Also offers a companion Bcrypt Hash Tester for quick verification. (browserling.com)

How to Check a bcrypt Password

To verify a candidate password against a stored bcrypt hash:

bcrypt.compare(candidatePassword, storedHash, (err, match) => {
if (match) {
console.log(‘✅ Password is correct’);
} else {
console.log(‘❌ Invalid password’);
}
});

1. Retrieve the hash from your database.

2. Call compare() with the user’s input and the hash.

3. Receive a boolean: true → allow login.

Most online bcrypt tools also include a “verify” mode—just paste both strings and click “Check.”

Is bcrypt Safe for Passwords?

Yes—bcrypt remains a top recommendation in 2025 thanks to its adaptive cost parameter, salt usage, and Blowfish foundation. While newer algorithms like Argon2 offer memory-hard features, bcrypt’s multi-language support and battle-tested reliability make it a safe choice for most applications.

Case Study: MyFitnessPal Breach

When Under Armour’s MyFitnessPal leaked 150 million accounts in 2018, most passwords were hashed with bcrypt—limiting attackers to offline brute-force attacks rather than instant reversals.

What Is the Weakness of bcrypt?

While strong, bcrypt has a few limitations:

• 72-byte limit: Inputs longer than 72 bytes are silently truncated.

• GPU vulnerability: Lacks memory hardness—modern GPUs can still brute faster than Argon2.

• No built-in pepper: You may need an extra server-side secret to guard against database plus code breaches.

Can You Decrypt a bcrypt Password?

No. bcrypt is one-way. You cannot reverse the hash to retrieve the original password. The only method is brute-force guessing combined with high computing power.

Does bcrypt Use a Key? Can bcrypt Be Reversed?

bcrypt’s “key” is your password plus salt mixed into Blowfish’s subkeys. There’s no secret key separate from the password and salt. Because the process is intentionally slow and one-way, you cannot reverse it—only match guesses until one produces the same hash.

Why Is bcrypt Better?

Compared to plain hashes (SHA-1, MD5) or unsalted functions, bcrypt offers:

• Salted outputs that foil rainbow tables .

• Adaptive cost to stay ahead of Moore’s Law.

• Wide language support from C to Rust to JavaScript.

• Proven track record in OpenBSD and major web frameworks.

While Argon2 may edge out bcrypt in memory-hard scenarios, bcrypt remains a perfect balance of security, compatibility, and ease of use.

Practical Tips & Next Steps

1. Choose cost ≥ 12 in production.

2. Rotate cost upward annually as hardware gets faster.

3. Store the full bcrypt string ($2b$...)—it includes salt and cost.

4. Combine with rate-limiting and multi-factor authentication.

5. Monitor breach disclosures and update users if hashes ever leak.

For generating other types of passwords (random strings, passphrases), check out SmashingApps’ Free Password Generator and learn about how attackers break weak credentials in How Hackers Crack Passwords in 1 Second.

Conclusion

bcrypt remains the gold standard for password hashing thanks to its adaptive cost, built-in salt, and long history of secure implementations. You’ve learned what bcrypt is, how it works, common pitfalls, and eight top online bcrypt password generator tools to streamline your workflow. Your next steps:

• Pick your favorite generator from our list

• Integrate bcrypt into your signup and login flows

• Educate your team on rotating cost over time

Ready to take password security up a notch? Which bcrypt tool will you try first?