Bcrypt Hash Generator & Verifier - Free Online

A bcrypt hash generator turns a password into a salted, one-way bcrypt hash you can store or test, and checks whether a password matches an existing hash. This free tool is built for developers and testers. Pick a cost factor from 4 to 14, generate the hash, copy it, or switch to verify mode.

What Is a Bcrypt Hash?

A bcrypt hash is the output of bcrypt, a password hashing algorithm that mixes in a random salt and a deliberately slow work factor. It is designed so that guessing passwords from a stolen hash is expensive, even on fast hardware.

Every bcrypt hash is 60 characters long and has the same layout. Knowing the layout helps you read the hash the tool gives you.

Add them up (4 + 3 + 22 + 31) and you get 60, which answers the common question about bcrypt hash length.

What Is Salt in a Bcrypt Hash?

The salt is a random 128-bit value that bcrypt generates for each hash and stores inside the hash string. Because the salt changes every time, two users with the same password get different hashes, and precomputed rainbow tables stop being useful. You never store the salt separately.

Why Is Bcrypt Slow on Purpose?

The cost factor sets how many rounds of work bcrypt performs: the work is 2 raised to the cost. Cost 10 means 1,024 rounds and cost 12 means 4,096 rounds, so each extra point doubles the time. A login check barely notices, but an attacker trying millions of guesses pays for every one.

How to Use the Bcrypt Hash Generator

You can create a hash in under a minute with the Generate Hash tab. Follow these steps:

1. Open the Generate Hash tab at the top of the tool.
2. Type or paste your text into Password to Hash. Use the visibility toggle if you want to check what you typed.
3. Watch the Password Strength bar. It rates the input from Very Weak to Very Strong as you type.
4. Move the Cost Factor (rounds) slider. It runs from 4 (Fast) to 14 (Slow), starts at 12, and marks 10 as the recommended setting.
5. Click Generate Bcrypt Hash. A short message says "Hashing... this may take a moment." Higher costs take longer.
6. Read the result under Bcrypt Hash, check the Algorithm, Cost Factor and Hash Length details, then press Copy.

To check an existing hash, open the Verify Hash tab. Enter the original text in Password to Verify, paste the hash into Bcrypt Hash (the field hints at a value starting with $2b$12$), and click Verify Password.

Worked Example: Hash a Password and Verify It

Here is a realistic test run that shows what the tool returns and how to read it.

Suppose you are building a login form and need a sample hash for a test user. You enter Summer2024! in Password to Hash and leave the cost at 12. The strength bar shows a fairly strong rating because the text mixes letters, digits and a symbol. After you click Generate Bcrypt Hash, the output is a 60-character string that begins with something like $2b$12$, and the details panel reports the algorithm, a cost factor of 12 and a hash length of 60.

Generate again with the same password and you get a different string. That is the salt at work, and both strings are valid. Now open Verify Hash and paste either one with Summer2024!. You see "Password Matches!" and the message that the password matches the provided hash. Change the password to summer2024! (lowercase s) and you see "Password Does Not Match", because bcrypt is case sensitive.

Now compare costs. At cost 10 the same password needs 1,024 rounds, and at cost 12 it needs 4,096, so cost 12 is four times the work. Try both and notice the pause is longer at 12.

How to Read and Act on the Results

Each output tells you something specific about your hash, and each message points to a clear next step.

Cost Factor

The cost shown in the results must match what you intended. A widely used guideline, including OWASP guidance, is a work factor of at least 10. Choose the highest value that still keeps a single login check comfortably fast on your own production hardware. Hardware varies, so test timing where the code will run. If logins feel sluggish, lower the cost by one. If they feel instant, consider raising it.

Hash Length and Algorithm

A healthy result shows a hash length of 60. If your database column is shorter, such as a 50-character field, the hash will be cut off and every verification will fail. Use a column that holds at least 60 characters. The Algorithm detail reports the bcrypt variant in the prefix, which matters when your framework expects a specific one. Laravel and PHP, for example, produce hashes starting with $2y$. The variants are closely related, and many libraries accept more than one, but check your framework documentation and confirm with a verify test.

Password Strength

The strength bar is a quick check on the input, not on the hash. A Very Weak or Weak rating means the password is easy to guess, and no cost factor can fully rescue it. Add length first, since a long passphrase beats a short complex one.

Verify Messages

• Password Matches! means the text hashes to the same digest using the salt and cost inside your hash.
• Password Does Not Match means the text differs from the original in some way, or the hash belongs to another password.
• Invalid Hash Format means the pasted value is not a well-formed bcrypt hash. Re-copy it and make sure it starts with $2 and is 60 characters.

Who Uses a Bcrypt Hash Generator?

This tool helps anyone who needs a bcrypt hash right now without writing code.

• Developers seeding databases: create hashes for test users in a Laravel, Node or Django project, then paste them into a seed file or SQL insert.
• QA testers: confirm that a stored hash really belongs to a known test password before debugging a login bug.
• System administrators: produce a hash for a config file or a user table that expects bcrypt values.
• Students: see how the cost factor, the salt and the 60-character format behave by experimenting with settings.
• Security reviewers: compare cost factors found in a legacy database with current recommendations.

If you work on a wider security checklist, the security and encryption tools collection covers related tasks such as certificates and request files.

Best Practices, Common Mistakes and Troubleshooting

Most bcrypt problems come from a handful of repeatable mistakes. Check these first.

• Comparing hashes as plain strings. Two hashes of the same password will never be equal. Always use the verify function of your library, or the Verify Hash tab, to compare a password with a hash.
• Truncated hashes. A short database column, a stray line break or a missing character in the copy will cause "Invalid Hash Format" or a false mismatch.
• Extra spaces. A trailing space in the password field counts as part of the password. Retype it if a match fails unexpectedly.
• Setting the cost too low. Cost 4 is useful for fast experiments, but it is far too weak for real accounts. Use 10 or higher for anything that matters.
• Expecting to reverse a hash. Searches such as bcrypt hash decrypt or bcrypt hash to text lead nowhere, because bcrypt is one-way. The only option is to guess a password and verify it against the hash.
• Using a fast hash instead. General-purpose digests like those from the SHA hash generator or the MD5 generator are good for checksums and fingerprints, not for storing passwords, because they are quick to brute force.

Defense in depth also matters. Hashing protects stored credentials, while other controls protect the page that collects them, such as a header built with the content security policy generator. If you are also preparing HTTPS for the login page, the CSR generator creates the request you send to a certificate authority.

Limitations and Accuracy Notes

The tool is accurate for what it covers, but it has clear boundaries you should know.

• The cost slider covers 4 to 14. The bcrypt algorithm itself allows higher values, but those are not offered here.
• Bcrypt only uses the first 72 bytes of a password. Anything beyond that is ignored, so two very long passwords that share the same first 72 bytes produce matching results. Passwords with emoji or accented characters use more bytes per character, so they reach the limit sooner.
• Hash time depends on your device and the cost you pick. Cost 14 is 16 times the work of cost 10 and can feel slow on a phone.
• Use sample passwords for testing and learning rather than live credentials. For production systems, your application should hash passwords with its own bcrypt library, and this page works best as a reference for checking the output.
• The tool generates hashes and verifies them. It cannot recover a password from a hash.

Ready to try it? Enter a test password above, pick a cost factor, and generate your hash, then switch to the Verify Hash tab to confirm it matches before you paste it into your project.