Securely generate cryptographic hashes and HMAC tokens locally in your browser.
A cryptographic hash function takes an input of any size and produces a fixed-length output called a digest that serves as a unique digital fingerprint of the data. Even a single character change in the input produces a completely different hash, making it useful for verifying data integrity. Our tool supports the most widely used algorithms: MD5 (128-bit, legacy), SHA-1 (160-bit, deprecated for security), SHA-256 (256-bit, industry standard), and SHA-512 (512-bit, maximum security). HMAC (Hash-based Message Authentication Code) extends these algorithms by incorporating a secret key, allowing you to create signed tokens that verify both integrity and authenticity—essential for API authentication.
Developers frequently need to generate hashes for verifying API webhook signatures, creating file integrity checksums, testing HMAC implementations, or debugging authentication flows. Our tool provides instant results using the Web Crypto API built into your browser, ensuring your input data and secret keys are never transmitted to any external server. This is especially critical when working with production API secrets or sensitive data payloads. The tool supports all major hash algorithms in one interface.
A standard hash takes only input data and produces a digest. Anyone with the same data can produce the same hash. HMAC adds a secret key, creating a keyed hash that can only be reproduced by someone who possesses the same key. This makes HMAC suitable for authentication and signing.
MD5 should not be used for security-critical purposes due to known collision vulnerabilities. However, it remains acceptable for non-security uses like checksums for data integrity verification in trusted environments.
For most modern applications, SHA-256 is the recommended standard. SHA-512 provides higher security but is generally only necessary for specialized cryptographic applications. SHA-1 is deprecated for security. MD5 should only be used for legacy compatibility.