Bcrypt Hash Generator
Generate and verify Bcrypt password hashes with adjustable salt rounds - runs entirely in your browser.
Generate and verify Bcrypt password hashes with adjustable salt rounds - runs entirely in your browser.
This free Bcrypt Hash Generator from KX Toolkit is part of our all-in-one online toolkit. It runs entirely in your browser, so your data never leaves your device for client-side operations. 100% free, forever - no paywall, no credit card, no trial.
How to use the Bcrypt Hash Generator
- Pick the algorithm or generation options.
- Enter your input (or click "Generate" for random output).
- Click the action button - the result appears instantly.
- Copy the result. Never paste sensitive secrets into the input again afterwards.
What you can do with the Bcrypt Hash Generator
- Generate strong passwords for new accounts.
- Hash data for verifying file integrity.
- Encode binary in Base64 for inline embedding.
- Test bcrypt or MD5 outputs while building auth systems.
Why use KX Toolkit's Bcrypt Hash Generator
- Browser-based: Works on Windows, macOS, Linux, iOS and Android - no install, no extension.
- Privacy-first: Client-side tools never upload your data; server-side tools delete files right after processing.
- Mobile-friendly: Full feature parity on phones and tablets - not a stripped-down view.
- Fast: Optimised for instant feedback. No artificial waiting screens, no email-gated downloads.
- One hub for everything: 300+ tools across SEO, text, image, PDF, code, color, calculators and more - skip switching between sites.
Tips for the best results
Always check the URL bar before pasting sensitive data - KX Toolkit's crypto tools run client-side, but you should still verify you're on the right domain.
Related Password & Encryption
If you find this tool useful, explore the full Password & Encryption collection or browse our complete tool directory. KX Toolkit is built for marketers, developers, designers, students and anyone who needs a quick utility without signing up for yet another SaaS.
Why is bcrypt better than SHA-256 for password storage?
Bcrypt is deliberately slow and includes per-hash salting, both essential for password defense. SHA-256 hashes billions of candidates per second on a GPU, so a stolen database is cracked quickly. Bcrypt with a cost factor of 12 takes hundreds of milliseconds per guess, slowing GPU brute force by orders of magnitude. The salt also prevents rainbow tables. Use bcrypt, scrypt, or Argon2 - never plain SHA - for credentials.
What does the cost or rounds parameter actually do?
The cost is a base-2 logarithm of the number of internal iterations bcrypt performs. A cost of 10 means 1,024 iterations, 12 means 4,096, 14 means 16,384. Each step doubles the time. Pick a cost so that hashing takes about 250 to 500 milliseconds on your production hardware - slow enough to deter offline attackers but fast enough that legitimate logins remain responsive. Reassess every couple of years as hardware improves.
How do I verify a password against a stored bcrypt hash?
Pass the candidate password and the stored hash to your library's verify function - for example password_verify in PHP or bcrypt.compare in Node. The hash itself contains the salt and cost, so the library extracts them, recomputes the hash with the candidate password, and compares the result in constant time. Never split the hash apart yourself or do plain string equality, because timing leaks can reveal information.
What is the password length limit in bcrypt?
Bcrypt processes only the first 72 bytes of the input password. Anything beyond that is silently ignored, which means a 100-character passphrase can collide with a truncated 72-character one. To support arbitrary length passwords, pre-hash with SHA-256 or HMAC-SHA-256 before passing to bcrypt, or switch to Argon2 which has no such limit. Most modern frameworks handle this transparently, but it is worth knowing.
Does the salt need to be stored separately from the hash?
No. Bcrypt embeds the salt and cost directly inside its output string, which starts with a marker like $2b$12$ followed by 22 characters of Base64-encoded salt and 31 characters of hash. You store the entire string in a single database column. When verifying, the library parses the string to recover the salt and cost automatically, so application code never has to manage the salt itself.
Is the password I type sent to a server when I generate a bcrypt hash?
No. The bcrypt computation runs in your browser through a JavaScript implementation, so your password and the resulting hash never leave your device. This makes the tool safe for testing your application's password verification logic without exposing real credentials. For production password hashing, always use a vetted server-side library - generating hashes in client code is for development and testing, not for live authentication flows.
No reviews yet
Be the first to share your experience with the Bcrypt Hash Generator.