Generate and verify bcrypt hashes with an adjustable cost, right in the browser, without the password leaving the page.
Bcrypt is a password-hashing function designed to be deliberately slow, making brute-force attacks harder. Unlike SHA-256, it builds a random salt into every hash and a cost factor that defines how many iterations are run, each increment doubles the work. As a result, a bcrypt hash is different every time, even for the same password, and verification compares the password against the salt embedded in the hash itself. This tool generates hashes in the modular format ($2b$cost$salt+hash) with the cost you choose, and also verifies whether a password matches an existing hash. Everything runs locally, so you can generate database seeds, test logins or study the algorithm without exposing secrets.
Paste the code into your HTML and the tool shows up on your page, without J-Kit's navigation and ads. It still runs in the browser of whoever visits your site.
<iframe
src="https://jkit.tools/embed/en-US/bcrypt-generator"
width="100%"
height="600"
style="border:0"
loading="lazy"
title="Bcrypt Generator & Verifier"
></iframe>These references help contextualize formulas, standards, APIs and limitations used on this page. They do not replace professional validation when a result has legal, financial, medical or operational impact.
Because bcrypt generates a new random salt on each run and embeds it at the start of the hash. This is intentional: two users with the same password get different hashes, which defeats rainbow-table attacks. Verification uses the salt stored inside the hash, so it still works even though the value changes.
Each +1 in cost doubles the computation time. 10–12 is the recommended balance today; higher values protect more against brute force but make login slower.
For safety, all bcrypt computation (generation and verification) happens in your browser using WebCrypto randomness. The password and hash are never sent to any server.