Bcrypt Hash Generator & Verifier

No — bcryptjs is not installed, so the tool falls back to PBKDF2-SHA256 via Web Crypto. It is an adaptive salted KDF with a configurable cost factor, fine for testing and learning.

Rounds is the cost factor; it maps to PBKDF2 iterations via 2^rounds x 1000. Each round doubles the work, keeping hashes strong as hardware improves.

No. Never hash passwords client-side for real authentication. Hash on the server with a vetted library (bcrypt, argon2id, scrypt) behind rate limiting.

Yes, the Bcrypt Hash Generator & Verifier is 100% free with no registration, no hidden fees, and no usage limits. All processing happens locally in your browser, ensuring complete privacy.

Absolutely. The Bcrypt Hash Generator & Verifier processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the Bcrypt Hash Generator & Verifier is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the Bcrypt Hash Generator & Verifier in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The Bcrypt Hash Generator & Verifier works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

Bcrypt and PBKDF2 are both adaptive, salted password-hashing functions, but they are built differently. Bcrypt is based on the Blowfish cipher and its cost factor controls how many key-setup rounds it runs, which also makes it use a fixed amount of memory. PBKDF2 simply repeats an underlying hash like HMAC-SHA256 many times, so its cost is set by an iteration count rather than a logarithmic round number. Both share the qualities that matter for password storage: a unique salt, a tunable work factor, and deliberate slowness. PBKDF2 is FIPS-approved and built into the browser's Web Crypto API, which is exactly why this tool uses it as a stand-in. Generate a hash above and watch how each step on the rounds slider doubles the work, just as bcrypt's cost factor does.

Each time you generate a hash, the tool creates a fresh 16-byte random salt using the browser's crypto.getRandomValues, then mixes that salt into the derivation. Because the salt is different on every run, two identical passwords produce two completely different output strings. This is intentional and is one of the most important properties of secure password storage: it means an attacker cannot tell that two users picked the same password, and it defeats precomputed rainbow tables, since those would have to be rebuilt for every unique salt. The salt is not a secret, so it is stored right inside the hash string in the salt segment, letting verification reuse the exact same value later. Generate the same password twice above to see two distinct hashes that both still verify correctly.

Verification never needs the original password on file; it only needs the stored hash. When you paste a password and an existing hash into the Verify tab, the tool reads the cost factor and salt directly out of the hash string, since both are encoded inside it. It then re-runs the exact same derivation on the password you typed and compares the freshly computed result against the stored one. If they match, the password is correct. The comparison uses a constant-time check that always examines every byte, so an attacker cannot learn anything by measuring how quickly a wrong guess is rejected. This is the same flow a real login system uses: hashes are stored, plaintext passwords are not. Try it by generating a hash, then pasting it back into the Verify tab to confirm a match.

The cost factor decides how much work each hash takes, and the right value is a balance between security and login speed. Here the rounds slider runs from 4 to 14, mapping to PBKDF2 iterations as 2 to the power of rounds, times 1000, so every extra round doubles the effort. Round 10 is a sensible default at roughly a million iterations; lower values like 4 are fine for quick demos, while 14 is intentionally heavy. A common rule of thumb is to pick the highest cost your server can absorb while still keeping a single legitimate login under about 100 milliseconds, since slow logins frustrate users but fast hashes help attackers. Because the function is adaptive, you can raise the cost later as hardware improves. Move the slider above and watch the timing readout to feel the tradeoff.

MD5 and SHA-256 are fast, general-purpose hash functions, and that speed is exactly the problem for passwords. A modern GPU can compute billions of plain MD5 or SHA-256 hashes per second, so if a database leaks, an attacker can test enormous wordlists against stolen hashes almost instantly. They also have no built-in salt, meaning identical passwords share identical hashes and precomputed rainbow tables crack them in moments. Adaptive functions like bcrypt, scrypt, argon2, and the PBKDF2 used here flip that math: they bolt on a unique salt and a tunable cost factor that makes each guess deliberately expensive, so a single login stays quick but mass cracking becomes impractical. This tool lets you experiment with that cost factor directly and see how slow, salted hashing changes the economics of an attack.