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Bcrypt Hash Generator — Hash Passwords with Bcrypt

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10

Higher cost = slower = more secure. Cost 10 typically takes under a second; cost 14 can take several seconds.

What is a Bcrypt Hash Generator?

A bcrypt hash generator converts a plaintext password into a salted, adaptively-slow hash designed specifically for password storage. Unlike fast general-purpose hashes such as MD5 or SHA-256, bcrypt's cost factor can be tuned to keep pace with improving hardware.

How to Use This Bcrypt Generator

  1. Switch to the Hash tab to create a new bcrypt hash, or Verify to check a password against an existing hash.
  2. In Hash mode, enter a password and choose a cost factor (10-12 is typical), then click Hash Password.
  3. In Verify mode, enter the password and the bcrypt hash to check, then click Verify.
  4. Copy the resulting hash with the Copy Hash button.

When Do You Need Bcrypt?

Use bcrypt whenever you need to store user passwords securely in a database, or when testing how your backend's password hashing behaves before deploying authentication code. Never use it for anything other than password storage — it is too slow for general-purpose hashing like checksums.

Frequently Asked Questions

What is bcrypt?
Bcrypt is a slow, adaptive password hashing algorithm built on the Blowfish cipher. It includes a built-in salt and a configurable cost factor that controls how computationally expensive each hash is, making brute-force attacks impractical.
Bcrypt cost factor — what to choose?
A cost factor of 10-12 is a reasonable default for most web applications in 2026, balancing security with login latency. Higher values roughly double the computation time per increment, so test the latency on your actual server hardware before deciding.
Bcrypt vs argon2?
Argon2 is the more modern winner of the Password Hashing Competition and offers better resistance to GPU and ASIC cracking by being memory-hard. Bcrypt remains widely supported and battle-tested, but Argon2 is generally recommended for new systems where available.
Why not use MD5 for passwords?
MD5 is fast and has no built-in salting or cost factor, meaning attackers can test billions of guesses per second with modern hardware. Bcrypt is intentionally slow and adaptive, making large-scale cracking attempts far less practical.