Password Hasher

What is Password Hasher?

Password Hasher generates secure one-way hashes from passwords using PBKDF2-SHA256 via the Web Crypto API. It supports configurable cost factors (iterations) that control computational difficulty, making brute-force attacks progressively more expensive. The tool can also verify a plaintext password against an existing hash. All hashing operations run entirely in the browser with no data transmission.

Backend developers implementing authentication systems, security engineers auditing password storage, and DevOps engineers preparing database seed data. The tool runs entirely in your browser — your data never leaves your device.

How to Use Password Hasher

1. Enter the plaintext password in the input field
2. Select the number of iterations — higher values increase security but take longer
3. Click Hash to generate the PBKDF2 hash with the configured cost factor
4. To verify, paste an existing hash and the plaintext password in the verify section
5. Copy the generated hash for use in database inserts or configuration files

Common Use Cases

• Generating password hashes for insertion into user database tables during development
• Verifying that a plaintext password matches a stored hash during authentication debugging
• Testing different cost factor values to find the right balance between security and response time
• Creating hashed passwords for seed data files in development and staging environments
• Validating that your application's password hashing produces the expected output format

Pro Tips

• Use at least 600,000 PBKDF2-SHA256 iterations as of 2024 per OWASP recommendations — lower values are considered insufficient against modern GPU-based attacks
• Never store plaintext passwords or reversible encodings like Base64 — always use a one-way hash function with a unique salt per password
• If your application can use Argon2id instead of PBKDF2, prefer it — Argon2id is memory-hard and provides better resistance against GPU and ASIC-based brute-force attacks

Why Use This Tool?

• Privacy-first: All processing happens locally in your browser. No data is transmitted to any server.
• No installation required: Works in any modern browser on desktop or mobile.
• Completely free: No account, no credit card, no usage caps.
• Fast and reliable: Powered by modern Web APIs for near-instant results.

Related Concepts

Learn more about related topics: PBKDF2, Argon2, Salt, Key stretching.

Frequently Asked Questions