Bcrypt Hash Generator & Verifier

Bcrypt Hash Generator

Generate secure bcrypt hashes for passwords.

Fast (4)Standard (10)Secure (15)

Security Insight

Bcrypt uses a "cost factor" (salt rounds) that determines how much time it takes to hash a password. A higher cost factor makes it harder for attackers to use "brute-force" attacks to guess your passwords. Rounds: 10 is currently the standard for most web applications.

Bcrypt Verifier

Check if a password matches a given hash.

Professional Tip

Never store passwords in plain text! Bcrypt is a "hashing function," not encryption. Hashing is a one-way process. You can never go from a hash back to the original password, you can only compare a new hash of a login attempt to the stored hash.

Bcrypt Guide Guide

How to Use

  1. 1Enter a password in the 'Password to Hash' field to generate a new bcrypt hash.
  2. 2Adjust the 'Salt Rounds' slider to increase or decrease the hashing cost (Standard is 10).
  3. 3Use the 'Bcrypt Verifier' section to test if a plain text password matches an existing hash.
  4. 4Copy the generated hash using the copy button for use in your application's database.

Formula & Logic

Bcrypt is an adaptive hashing function based on the Blowfish cipher. It incorporates a salt to protect against rainbow table attacks and is resistant to brute-force attacks by having a configurable iteration count (cost).

Password= The plain-text string to hash.
Salt= A random string (generated automatically) to prevent rainbow table attacks.
Cost= The complexity factor (2^cost rounds).

Practical Applications

User Authentication

Hash user passwords before storing them in your database to ensure security even if your data is leaked.

Database Security

Migrate old, insecure MD5 or SHA-1 hashes to the modern bcrypt standard.

Security Testing

Quickly verify if a password matches a hash during manual security audits or development.

Frequently Asked Questions

Q.Why is Bcrypt better than SHA-256 for passwords?

SHA-256 is a fast cryptographic hash, designed for integrity checks. Bcrypt is deliberately slow, making it much harder for attackers to use brute-force hardware (like GPUs) to crack passwords.

Q.What is a 'Salt' in Bcrypt?

A salt is random data added to the password before hashing. Bcrypt automatically generates and includes the salt within the final hash string, so every password hash looks different even if the passwords are the same.

Q.How many Salt Rounds should I use?

10 rounds is the current recommended minimum for most web applications. Higher numbers provide more security but take more time to compute on your server.