What is Bcrypt Password Hash Generator?
A Bcrypt Password Hash Generator produces a bcrypt password hash on demand, using a deterministic algorithm or a cryptographically strong random source. Output is generated entirely in your browser so nothing is sent to a server. Useful for creating strong unique credentials for online accounts.
Bcrypt Password Hash Generator
Generate bcrypt password hashes in your browser - configurable cost factor (4-12). Verify mode supported.
TLDR
Type a password, pick a cost factor (10 is a good default - higher is slower but stronger), click Generate. The page uses bcryptjs in your browser to produce a salted bcrypt hash. Switch to Verify mode to check a password against a hash.
How to use this tool
- Enter your inputs. Each field is labeled with what it expects.
- Read the result instantly. Numbers update as you type or change inputs.
- Adjust to test sensitivity. Change one input at a time to see what moves the result most.
- Cross-check the formula in the section below if you want to verify the math.
- Copy or screenshot the result for later. The site does not save anything; close the tab and inputs are gone.
About this tool + how it works
This tool runs 100% in your browser - the libraries load from a public CDN and the math runs on your device. Nothing is uploaded to a server. The underlying logic is:
hash = bcrypt(password, salt = generate_salt(rounds)) verify(password, hash) returns true/false
You can verify by opening the browser developer tools and watching the Network tab; you'll see no requests fired during normal use beyond the initial page and library load.
Real-world scenarios where this tool helps
Local development
Generate test secrets, API tokens, or seed values without spinning up a backend.
Security education
See how hash output changes with one character of input change - useful for teaching.
CI / config files
Generate one-off secrets to drop into a YAML or .env, then rotate later.
Penetration testing prep
Create test passwords, tokens, and keys for an authorized engagement.
What this tool does
- Runs 100% in your browser - no upload, no signup, no logging.
- Uses the Web Crypto API (or CDN library when the browser does not ship the algorithm natively).
- Copy result button + clear button always visible.
- Works on phones, tablets, and desktops; loads in under a second.
- Free forever; no premium tier, no API key required.
What it does NOT do
- Does not store, log, or send your input anywhere.
- Does not require an account, an API key, or a paid plan.
- Does not replace a hardware security module - any browser computation is visible to other browser tabs / extensions.
- Does not guarantee constant-time crypto - timing attacks are possible against badly-engineered browser crypto (mitigated when the Web Crypto API does the work, but not when fallback JS libraries do).
Common mistakes and pitfalls
- Treating browser-computed crypto as fit for HSM-level secrets - it is not.
- Forgetting to click Copy before navigating away - browser memory is cleared.
- Using a weak or short input where the algorithm cannot help (a 4-char password hashed with SHA-256 is still 4 chars of entropy).
- Comparing your output against a different tool's output character-by-character - some tools use different encodings (hex vs base64) for the same byte string.
Frequently asked questions
Is this tool free?
Yes - free forever, no signup, no daily limit. Everything runs in your browser.
Where does my input go?
Nowhere. The transform runs entirely in your browser. Nothing is uploaded, stored, or logged.
Is this safe to use for real secrets?
The math is correct, but a browser tab is not a secure environment - other tabs, extensions, and the OS clipboard can see what you compute. For high-stakes secrets (real passwords, production keys), generate them in an offline password manager or a dedicated KMS.
Does it work offline?
After first load yes. The page + libraries cache in your browser.
Will it handle large inputs?
Yes up to several MB. Hashing and base64 are O(n) and the browser handles MBs in milliseconds.
Is MD5 / SHA-1 still safe to use?
Not for password storage or digital signatures - both are broken against collision attacks. They're fine for non-security uses (checksums, deduplication keys, ETag headers). For password storage use bcrypt / Argon2 / scrypt; for signatures use SHA-256 or stronger.
How long should a hash be for password storage?
Use a slow hash (bcrypt with cost >= 10, Argon2id with memory >= 64 MiB) - not a fast SHA-256. Slow hashes resist GPU-farm brute force; fast hashes do not.
Why does my output differ slightly from an online hash calculator?
Almost always whitespace or line-ending difference. SHA-256 of 'abc' (no newline) and SHA-256 of 'abc\n' (with newline) produce completely different output. Strip trailing newlines if you suspect this.
Are AES keys and RSA keys generated here cryptographically sound?
Yes - the browser's Web Crypto API is the same primitive Chrome uses for TLS. Keys are generated from the OS entropy pool. For production use, ensure your threat model is OK with browser-resident keys (vs an HSM).
What does cost factor mean in bcrypt?
Bcrypt runs 2^cost iterations of its core mixing function. Cost 10 = 1024 iters (~50 ms). Cost 12 = 4096 iters (~250 ms). Each +1 doubles the time. Pick the highest value where login latency is still acceptable.