Bcrypt Hash Generator

How to Use the Free Client-Side Bcrypt Hash Generator

Bcrypt is a password hashing function built for the specific job of storing secrets, with salting folded in automatically. This tool runs a WebAssembly implementation of bcrypt entirely in your browser, so hashing is fast and nothing touches a server.

1. Type or paste the password you want to hash.
2. Set the cost factor on the salt rounds control, from 4 to 16.
3. Click Generate and copy the resulting hash string for storage in your database.
4. To verify later, paste a password and an existing hash into the Compare feature to confirm whether they match.

When to Use Bcrypt Hash Generator

If you manage user accounts, this is the hashing approach your stack probably uses. Bcrypt was designed specifically to slow down attackers, and its built-in salt means identical passwords produce different hashes, so you cannot spot repeated credentials by scanning a column. Developers reach for this tool when seeding a user table, migrating from an older scheme, or generating test fixtures that need realistic hashes.

The Compare feature is what makes it a full workflow rather than a one-shot calculator. During login debugging or support investigations, being able to verify that a given plaintext matches a stored hash, without spinning up your whole application, is genuinely useful. You can also use it to sanity-check that your own verification code produces the same match.

Bcrypt Hash Generator Tips and Best Practices

1. Keep salt rounds between 10 and 12. Lower values like 4 to 6 compute too quickly to resist brute force, and each additional round doubles the work, so test performance before pushing higher.
2. Remember bcrypt truncates passwords at 72 bytes. For longer secrets, consider pre-hashing with SHA-256 first or moving to Argon2, which has no such limit.
3. Never hand-roll your own password algorithm. Established libraries like bcrypt have survived years of scrutiny; your custom scheme has not.
4. Copy the complete hash string, including the salt and cost prefix. Truncating or editing it breaks both storage and verification.

Why Client-Side Privacy Matters for hashing and verifying passwords for secure storage

The raw password is the one value you should be most paranoid about transmitting. A plaintext password sent to a server-based hasher is exposed in transit, and it may be retained in logs, caches, or analytics, which defeats the entire purpose of hashing in the first place.

This tool keeps the password on your device. The WebAssembly bcrypt implementation runs locally, the Compare check happens in your browser, and no part of your plaintext or hash is ever uploaded, so the only copy of your secret that exists is the one you control.