Bcrypt Hasher & Verifier
Securely generate and verify Blowfish-based Bcrypt password hashes in real-time. Configurable cost factors, instant salt decomposition, and 100% in-browser verification.
Bcrypt Blowfish Cipher
$2b$10$wN9P3XJ9d...53chars
Default: 10 (1024 key expansion iterations)
In-Browser Adaptive Bcrypt Password Hashing
The Bcrypt Hasher & Verifier tool provides a secure, client-side interface for generating and verifying Blowfish-based Bcrypt password hashes directly within your web browser. Built on pure JavaScript bcrypt implementations, all hashing and signature verification occur strictly in local memory without transmitting credentials over the network.
Bcrypt is an adaptive key-derivation function based on the Eksblowfish (keying-expanded Blowfish) cipher. Unlike fast cryptographic hash algorithms like MD5 or SHA-256, Bcrypt includes an adjustable cost/work factor ($2b$10$). This cost factor dictates how many key expansion rounds (2^cost) are executed during digest computation, deliberately slowing down brute-force and GPU dictionary attacks.
The utility allows full inspection of generated hash strings ($2b$ prefix, work cost factor, 22-character salt, and 31-character cipher digest), alongside a standalone verifier tab to test plaintext passwords against candidate hashes without exposing secrets to external servers.
Core Tool Capabilities
- Adaptive Cost Factor Control: Adjust key expansion rounds from 4 to 14 (default 10) to benchmark performance and security trade-offs for your application.
- Salt & Cost Factor Decomposition: Automatically parses and displays structural components ($2b$ version prefix, cost factor, salt string, and hash digest).
- Real-Time Hash Verification: Verify candidate plaintext passwords against existing $2a$, $2b$, or $2y$ Bcrypt hash signatures.
- In-browser Execution: Executes hashing logic using client-side JavaScript memory, eliminating remote server logs and network interception risks.
- Timing & Performance Metrics: Measures execution latency in milliseconds to assist developers in tuning password hashing iteration budgets.
Local Browser Privacy
Your files are processed locally on your device. Files are not uploaded, transmitted, or stored on remote servers.
Once the page has loaded, you can disconnect your network connection and continue using this tool offline.
Target Use Cases
- • Developer Staging & Database Seeding
- • Credential Verification Debugging
- • Performance Benchmarking
- • Educational Security Analysis
Technical Specifications & Platform Limits
Adaptive salted password hashing designed for credential storage.
Fully compatible with standard BSD, OpenBSD, and modern framework Bcrypt variants.
Configurable work factor to balance server latency and brute-force resistance.
Standard 60-character base64-like encoded string structure.
Zero network transmission, server processing, or password logging.
Step-by-Step Workflow
Select Mode (Generate or Verify)
Choose 'Hash Generator' to create a new Bcrypt hash or 'Hash Verifier' to test a candidate password against an existing hash.
Configure Cost Factor
For hash generation, set the desired work factor slider between 4 and 14 (cost factor 10 is recommended for general applications).
Enter Password String
Type or paste the plaintext password or string into the input field.
Execute and Inspect
Click 'Generate Bcrypt Hash' or 'Verify Password Match' to compute the hash and review execution metrics.
Copy Result
Click the 'Copy Hash' button to transfer the 60-character Bcrypt hash to your system clipboard.
Practical Real-World Use Cases
Developer Staging & Database Seeding
Backend developers generating valid Bcrypt password hashes for database seed scripts and fixture data.
Credential Verification Debugging
Authentication engineers verifying whether candidate passwords match hashed credentials stored in application databases.
Performance Benchmarking
Security engineers testing the latency impact of cost factor settings (e.g., cost 10 vs cost 12) on user login response times.
Educational Security Analysis
Students and auditors inspecting the internal structure of salt strings and cost factors within standard $2b$ hashes.
Frequently Asked Questions
- Is Bcrypt considered encryption?
- No. Bcrypt is a one-way cryptographic password hashing function with an adaptive salt, not encryption. Hashes cannot be 'decrypted' back to plaintext; candidate passwords can only be verified by hashing them with the same salt and checking for equality.
- Are my passwords uploaded to a server when using this tool?
- No. All password hashing and verification operations are computed Client-side in your web browser using JavaScript. No passwords or hashes leave your device.
- What is the difference between $2a$, $2b$, and $2y$ Bcrypt prefixes?
- $2a$ was the early standard. $2b$ is the current default introduced to fix a minor specification edge case. $2y$ is used by PHP's password_hash implementation to denote correct UTF-8 handling. All three use the same underlying algorithm.
- Why is a high cost factor important?
- The cost factor exponentially increases the computation work (2^cost). Higher cost factors slow down automated brute-force attacks on compromised password databases.
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Master this tool with Guides & Articles
Learn the workflows, common mistakes, and advanced techniques behind Bcrypt Hasher & Verifier with our deep-dive educational content.
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