Bcrypt Password Hash Generator & Work Factor Verifier
Generate secure Eksblowfish password hashes with custom salt cost rounds (4–14) and verify credentials in real-time with 100% browser execution.
01. Understanding Bcrypt & Adaptive Work Factors (Cost Rounds)
Bcrypt is a key derivation function designed by Niels Provos and David Mazières in 1999, specifically engineered for password storage. Built on the Eksblowfish (Extended Key Setup Blowfish) cipher, its core architectural advantage is an adaptive work factor (salt rounds).
Each increment in cost doubles the computation time required to calculate a hash (2^cost iterations). This exponential scaling allows security engineers to adjust hashing difficulty as hardware becomes faster, effectively thwarting offline brute-force attacks.
Our client-side Bcrypt tool generates compliant `$2a$` and `$2b$` hash strings and verifies password credentials directly in your browser memory.
- Configurable work factor cost rounds from 4 to 14.
- Generates cryptographically random 128-bit salts per hash.
- Real-time credential verification matching passwords against hash strings.
02. How to Hash and Verify Passwords
1. Enter the plaintext password in the input field.
2. Select the desired cost rounds (OWASP recommends 10 to 12).
3. Click 'Generate Bcrypt Hash' to compute the hash.
4. To verify an existing hash, paste the hash and candidate password into the verification tester.
03. OWASP Security Guidelines
• Use a cost factor of at least 10–12 for web production authentication.
• Be aware of Bcrypt's 72-byte password length truncation limit.
• Pre-hash inputs with SHA-256 if you need to support arbitrary-length passwords.
04. Credential Security & Identity Protection Pipeline
Strengthen authentication pipelines by evaluating password strength with our Password Entropy Tester, generate high-entropy authentication secrets using the Token Generator, or compute integrity checksums with the Hash Generator.
Frequently Asked Questions (FAQ)
Why does Bcrypt generate a different hash every time for the same password?
Because Bcrypt automatically generates a unique random 128-bit salt for each hash calculation.
What is the 72-byte limit in Bcrypt?
The Eksblowfish algorithm truncates password inputs beyond 72 bytes. Characters past byte 72 are ignored.
Are my passwords uploaded to any server?
No. All Bcrypt calculations run locally in your browser.
How does local in-browser processing protect sensitive enterprise credentials?
All code runs inside your local browser memory. No data is ever sent to an outside server. Your keys, tokens, and code remain completely private on your device.
Can I use this tool offline or within air-gapped networks?
Yes. Once the page loads, it works fully offline. You can use it safely on airplanes, private corporate networks, and secure offline computers.
How does the workload cost factor affect hashing performance?
Bcrypt uses exponential key stretching (2^cost rounds): cost factor 10 executes in ~80–150 ms, cost 12 takes ~400–700 ms, while cost 14 requires ~3–6 seconds per hash depending on CPU single-core performance. To avoid freezing the UI during intensive calculations, execution is processed asynchronously.
Are outputs formatted according to official industry standards?
Yes. All conversions follow official web and data standards. This ensures your outputs work smoothly across Linux, macOS, and Windows systems.
Is Bcrypt Hash Generator & Salt Verifier Online free to use with any rate limits or paywalls?
Core tools are free to use without an account. Device memory and tool-specific safety limits apply. Optional AI and online contact services have usage limits.