What Is Bcrypt and Why Use It?
Bcrypt is a password-hashing algorithm purpose-built to be slow. In a bcrypt vs sha256 comparison, SHA-256 and MD5 are fast general-purpose hashes and therefore poorly suited for storing passwords, since an attacker with a leaked hash database can brute-force fast hashes at billions of attempts per second. A bcrypt generator online lets you generate bcrypt hash values with the same algorithm your backend uses, so you can see exactly what gets stored, verify a login against a stored hash, and understand the cost-rounds tradeoff without writing a throwaway script.
How to Hash a Password With This Tool
Type or paste a password into the Hash panel, set the cost rounds (12 is the practical default), and this bcrypt password hash generator produces a complete bcrypt hash string along with how long the hashing operation actually took in milliseconds. Because bcrypt automatically generates and embeds a random salt into every hash, running the same password through this bcrypt hash generator twice produces two different, equally valid hash strings, that is expected behavior, not a bug.
How to Verify a Password Against a Bcrypt Hash
Paste a password and an existing bcrypt hash into the Verify panel to bcrypt verify online, and the tool reports whether they match along with the verification time. As an online bcrypt checker, this is useful for debugging a login flow that is rejecting a password unexpectedly, confirming a hash was generated correctly during a migration, or checking a hash pulled from a database during support work.
Choosing a Cost Factor: How Many Rounds?
The cost rounds value controls how many times the underlying algorithm iterates internally, each increment roughly doubles the computation time. 10 to 12 rounds is the widely recommended range for production use, balancing brute-force resistance against acceptable login latency, going much higher meaningfully slows down real logins and password resets, while going lower weakens protection against offline cracking attempts. This tool live timing display makes that bcrypt cost rounds tradeoff concrete instead of theoretical, since bumping the rounds up visibly increases the milliseconds shown.
Common Use Cases
Testing an authentication flow locally without a running backend, seeding a test user with a known password and its hash, debugging why a login is failing by verifying a password against the exact hash stored in a database, or confirming a data migration produced correctly formatted bcrypt hashes are all common reasons to reach for a bcrypt generator. Hashing runs through a lightweight server call rather than a library you install, and the password or hash you enter is never logged or stored, only the tool name is recorded for usage metering.