How to Generate a Bcrypt Hash

Overview

A bcrypt hash is a password representation used when an application needs to handle password values without keeping them in plain text. This generator accepts an optional password and an optional cost-rounds value, then produces bcrypt-related hash and salt output for a non-empty password. It can help when developing or testing password-handling workflows, comparing output formats, or preparing a value for a separate bcrypt verification step.

The password field can be left blank, and the rounds field has a default. That makes a quick test possible with minimal input, while the configurable cost rounds let you choose a value within the supported generation range. A new salt means that repeated generation can produce different hashes, even when the password and rounds match.

Steps

1. Enter the password you want to process. The field is optional; leaving it empty uses an empty string. For a normal bcrypt hash, enter a non-empty password.

2. Enter a cost-rounds value if you want to set one. If you leave it blank, the default is 12. For a non-empty password, the supplied value is converted to an integer and constrained to the supported range of 10 through 15 before generation.

3. Start the bcrypt hash generation. With a non-empty password, the password is encoded as UTF-8, a salt is generated, and the tool produces a bcrypt hash. If rounds conversion or bcrypt generation raises a type or value error, the operation reports failure instead of returning a successful hash.

4. Review the returned hash and salt fields. Keep them separate from the password during your workflow. If you need to test the result in an application, use the original password with a bcrypt verification operation; a generated hash can be checked successfully with the original password.

Understanding the result

A successful result for a non-empty password contains bcrypt-related hash and salt values. Do not expect the same hash every time for the same password and rounds: each generation creates a new salt. This is why comparing two generated hash strings directly is not a useful way to decide whether the inputs matched. Verification with the original password is the appropriate check for a generated hash.

An empty password is a defined exception. When the password field is empty, the computation succeeds but returns empty hash and salt values associated with bcrypt, rather than a normal non-empty-password hash. Treat that result differently from a generated credential hash.

The rounds setting affects generation only within the supported 10-through-15 range for a non-empty password. A value outside that range is constrained before generation, while an input that cannot be converted as required can lead to failure. The tool declares that it does not use network access, but that statement does not establish how inputs are stored, logged, retained, or shared. It also does not establish where execution occurs.

Worked example

A developer needs a bcrypt test value for the password “Sample Passphrase 42” and chooses 12 cost rounds.

Enter the password, enter 12 for cost rounds, and start generation.

The result has bcrypt-related hash and salt values for the non-empty password. Repeating the action can produce different hash text because a new salt is generated.

Limitations

• The tool declares no network access, but this does not establish whether inputs are stored, logged, retained, or shared, or where execution occurs.

Common errors

• Entering no password and expecting a normal bcrypt hash causes confusion because the empty-input path succeeds with empty hash and salt values. Enter a non-empty password when you need generated hash output.

FAQ

What happens if I leave the bcrypt rounds field blank?

When you leave the rounds field blank, the default is 12. For a non-empty password, a supplied value is converted to an integer and constrained to 10 through 15 before generation.

What happens if the password field is empty?

The computation succeeds, but it returns empty hash and salt values associated with bcrypt rather than a normal hash for a non-empty password.

Will the same password always produce the same bcrypt hash?

A new salt is generated, so the same non-empty password and rounds can produce different hashes. Check a generated hash with bcrypt verification and the original password instead.