Hash Generator — MD5, SHA-256, SHA-512 & HMAC Online

Create cryptographic hash values with our versatile Hash Generator. The tool supports all common hash algorithms: MD5, SHA-1, SHA-256, SHA-384, and SHA-512. Generate hashes from text or files, create HMAC signatures with custom keys, and generate Subresource Integrity (SRI) hashes for secure CDN integration. Live mode enables real-time hashing during input, and the hash comparison feature helps verify file integrity.

W3C SRI Web Crypto API Client-Side Only

Features

Multiple hash algorithms: MD5, SHA-1, SHA-256, SHA-384, SHA-512
Hash text and files
Compare hashes for verification
HMAC support with custom keys
Uppercase and lowercase output options
Copy hashes with one click
Real-time hash generation
100% client-side processing - your data never leaves your browser

Security Considerations

Use SHA-256 or higher: MD5 and SHA-1 are cryptographically broken
Don't use plain hashes for passwords: Use bcrypt, scrypt, or PBKDF2 instead
Add salts for password hashing: Prevent rainbow table attacks
Verify hash integrity: Always compare full hash values, not truncated versions
Use HMAC for authentication: Provides both integrity and authenticity

Common Use Cases

File Integrity Verification: Verify downloads haven't been tampered with
Password Hashing: Store secure password hashes (use SHA-256 or higher)
Data Deduplication: Identify duplicate files or content
Checksum Generation: Create checksums for data validation
Digital Signatures: Component of cryptographic signature systems
API Authentication: Generate HMAC signatures for API requests

Hash Algorithm Selection

MD5: Fast but not recommended for security (128-bit, vulnerable to collisions)
SHA-1: Deprecated for security use (160-bit, collision attacks exist)
SHA-256: Industry standard for security applications (256-bit, secure)
SHA-384: High security variant (384-bit, very secure)
SHA-512: Maximum security variant (512-bit, very secure)

Useful Resources

NIST Cryptographic Hash Functions Official NIST documentation and standards for hash algorithms

Secure Hash Algorithms (SHA) - Wikipedia Comprehensive overview of SHA family algorithms and their security

MDN SubtleCrypto.digest() Browser API documentation for generating cryptographic digests

OWASP Password Storage Cheat Sheet Security best practices for password hashing and storage