Free online hash generator - MD5, SHA-1, SHA-256, SHA-512 with HMAC support
Privacy-first
All hashing done locally
Multiple algorithms
MD5, SHA-1, SHA-256, SHA-512
HMAC support
Keyed-hash authentication
A hash function is a mathematical algorithm that transforms any input data into a fixed-size string of characters. This output, called a hash or digest, uniquely represents the original data. Hash functions are one-way - you cannot reverse the process to get the original data from the hash.
For new applications, use SHA-256 or higher. SHA-256 is widely supported and provides excellent security. SHA-384 and SHA-512 offer even more security but produce longer hashes. Avoid MD5 and SHA-1 for security purposes as they have known vulnerabilities.
HMAC (Hash-based Message Authentication Code) combines a hash function with a secret key to provide both data integrity and authentication. It's useful when you need to verify that a message hasn't been tampered with and comes from a trusted source.
Yes, all hashing is performed locally in your browser using the Web Crypto API. Your data never leaves your device, and we don't store or transmit any of your input or generated hashes. The entire process happens client-side for maximum privacy.