What is bcrypt and how does it work?

Bcrypt is a password-hashing function based on the Blowfish cipher. It automatically generates and embeds a random salt with every hash and applies a configurable number of iterations (the cost factor), making each hash unique and slow to brute-force — even for identical passwords.

What cost factor should I use for bcrypt?

A cost factor of 10 to 12 is recommended for most applications in 2026. Each increment doubles the computation time, so 12 takes roughly 4x longer than 10. Higher values are more resistant to brute-force attacks but increase server load and login latency.

How do I verify a password against a bcrypt hash?

Use the Verify section: paste the bcrypt hash and type the plaintext password you want to check. The tool extracts the salt and cost factor from the hash itself and tells you instantly whether the password matches.

Is bcrypt still secure in 2026?

Yes. Bcrypt remains a widely recommended password-hashing algorithm because its adjustable cost factor lets it stay slow even as hardware gets faster. For new systems, Argon2 is also recommended, but bcrypt is still considered secure when used with a cost factor of 10 or higher.

Does this tool send my password to a server?

No — never. Hashing and verification run entirely in your browser using a JavaScript bcrypt library. Nothing you type is transmitted, logged, or stored anywhere. You can use this tool completely offline after the page loads.

Bcrypt Generator Free Online – Hash & Verify Passwords

Q: What is the difference between bcrypt and SHA-256 for passwords?

SHA-256 is a fast general-purpose hash, which makes it unsuitable for passwords — attackers can compute billions of guesses per second. Bcrypt is deliberately slow and includes a built-in salt and adjustable cost factor, making large-scale password cracking far more expensive.

// Features Why Use I7 Pixel's Free Bcrypt Generator?

Hashing a password correctly matters — get it wrong and your users' accounts are at risk. I7 Pixel's free bcrypt generator hashes and verifies passwords using the same algorithm trusted by countless production systems, entirely inside your browser. Adjust the cost factor, see the timing for each hash, verify any password against an existing hash, and keep a local history — without ever sending a single character to a server.

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Industry-Standard Bcrypt

Hashes are generated with the well-tested bcryptjs library, producing standard $2a$ / $2b$ hashes compatible with PHP, Node.js, Python, and most backend frameworks.

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Adjustable Cost Factor

Set the cost factor from 4 to 15. Each increment doubles the work required, letting you balance security against the time it takes to hash and verify.

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Built-In Verification

Paste any bcrypt hash and a candidate password to instantly check whether they match — the salt and cost factor are read automatically from the hash itself.

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Show / Hide Password

Toggle visibility on both the password and verification fields with one click, so you can confirm exactly what you typed before hashing.

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Password Strength Meter

A live strength indicator gives instant feedback on the password you're about to hash, helping you avoid hashing weak or predictable values.

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One-Click Copy

Copy the generated hash instantly from the sticky tool header or the result panel — ready to paste into your database, config file, or test script.

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Hash History

Every hash you generate is saved to a local history with a masked version of the password, the cost factor used, and the time it took — click any entry to copy it again.

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Timing Feedback

See exactly how many milliseconds each hash takes at your chosen cost factor — useful for tuning the right balance for your server's hardware.

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Free, Instant, No Signup

No account, no email, no install. Everything — hashing, verification, history, and copy — runs locally in your browser and is free forever.

// Guide How to Generate a Bcrypt Hash Online — Step by Step

Hashing or verifying a password with bcrypt takes just a few clicks. Here's the full workflow.

1

Enter Your Password

Type or paste the password into the input field. Use the eye icon to toggle visibility and double-check what you've entered.

2

Set the Cost Factor

Pick a cost factor between 4 and 15. The default of 10 is a solid balance of security and speed for most applications.

3

Click Hash Password

The bcrypt hash is computed locally and displayed along with the time it took at the chosen cost factor.

4

Copy or Verify

Click Copy Hash to grab the result, or paste it into the Verify section with a candidate password to confirm a match.

// Deep Dive What Is Bcrypt and Why Does It Matter?

Bcrypt has been a cornerstone of secure password storage for over two decades. Here's what it is, how it works, and why it's still recommended today.

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What Is Bcrypt?

Bcrypt is a password-hashing function based on the Blowfish cipher, designed specifically to be slow and resistant to brute-force attacks. Every bcrypt hash has the form $2b$10$saltsaltsaltsaltsaltsahashhashhashhashhashhashhashha — it embeds the algorithm version, the cost factor, a random 16-byte salt, and the resulting hash all in one string. Because the salt is unique per hash, two identical passwords will produce two completely different hashes, which prevents attackers from using precomputed rainbow tables.

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What the Cost Factor Actually Does

The cost factor (also called "rounds") determines how many times the underlying key-setup algorithm runs — specifically, 2^cost iterations. A cost of 10 means 2¹⁰ = 1,024 iterations; a cost of 12 means 4,096 iterations. Each +1 to the cost factor roughly doubles the time needed to compute a single hash. This is intentional: it makes hashing slightly slower for legitimate logins, but makes brute-forcing millions of password guesses prohibitively slow for attackers. I7 Pixel's tool shows the exact timing for your chosen cost factor so you can tune it for your hardware.

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Why Bcrypt Is Better Than SHA-256 or MD5 for Passwords

Algorithms like MD5 and SHA-256 are fast by design — great for checksums, terrible for passwords. A modern GPU can compute billions of SHA-256 hashes per second, making brute-force attacks on leaked hash databases trivial. Bcrypt deliberately trades speed for security: its built-in salt eliminates rainbow-table attacks, and its tunable cost factor lets it stay computationally expensive even as hardware improves. This is why bcrypt (and its successors Argon2 and scrypt) remain the recommended choices for storing user passwords, while MD5 and plain SHA-256 are considered unsuitable.

// Use Cases Who Uses a Bcrypt Generator?

From backend developers to security students, this free tool is useful anywhere bcrypt hashes need to be generated, inspected, or tested.

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Backend Developers

Quickly generate a bcrypt hash to insert directly into a database for test accounts, seed data, or fixtures — without spinning up a script or REPL.

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Debugging Auth Issues

Paste a hash from your database and a candidate password into the Verify tool to confirm whether a login failure is a hashing mismatch or a different bug.

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QA & Test Engineers

Generate known password/hash pairs for automated test suites, or verify that an application's hashing configuration matches expectations.

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Students & Security Learners

Experiment with how the cost factor affects hashing time, and see firsthand why identical passwords produce different hashes thanks to salting.

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DevOps & SREs

Benchmark how long a given cost factor takes on different hardware to choose settings that won't bottleneck login throughput under load.

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Migration Projects

When migrating legacy systems to bcrypt, use this tool to sanity-check new hashes against known plaintext passwords before rolling out to production.

// FAQ Frequently Asked Questions

Answers to the most common questions about bcrypt and how to use this generator.

Bcrypt is a password-hashing algorithm based on the Blowfish cipher. It automatically generates a random salt for every hash and runs a configurable number of iterations (the cost factor), so even identical passwords produce different, slow-to-crack hashes like $2b$10$....

A cost factor of 10–12 is recommended for most web applications in 2026. Each +1 roughly doubles the hashing time. Try a few values in this tool and watch the timing display to find what feels right for your hardware and login volume.

Switch to the Verify panel, paste the full bcrypt hash (e.g. $2b$10$...) and the plaintext password to test, then click Verify. The salt and cost factor are extracted automatically from the hash, and the tool reports a match or no match instantly.

Yes — bcrypt with a cost factor of 10 or higher is still considered secure and is widely used in production. Newer algorithms like Argon2 are recommended for brand-new systems, but bcrypt remains a solid, well-audited choice.

No — never. Hashing and verification run entirely in your browser using a local JavaScript bcrypt library. Nothing is transmitted, logged, or stored. You can disconnect from the internet after the page loads and the tool keeps working.

SHA-256 and MD5 are fast general-purpose hashes — great for checksums, bad for passwords, since attackers can try billions of guesses per second. Bcrypt is deliberately slow and includes a built-in salt and tunable cost factor, making large-scale cracking far more expensive.

This is by design. Bcrypt generates a new random salt every time you hash, which is embedded in the output string. Different salts produce different hashes for the same input — that's exactly what defeats rainbow-table attacks. Use the Verify panel, not string comparison, to check a password.

Bcrypt only processes the first 72 bytes of input — anything beyond that is silently ignored. For almost all real-world passwords this is irrelevant, but very long passphrases should be hashed with SHA-256 first if you need to use every character.

// Reviews User Ratings & Feedback

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