Hash Generator

The Hash Generator computes cryptographic hashes using MD5, SHA-1, SHA-256, and SHA-512 algorithms with support for HMAC authentication and salt-based hashing. Cryptographic hashing is a fundamental building block of modern software security. Every time you verify a file download integrity, store a password securely, check an API request authenticity, or compare two pieces of data for equality without revealing the data itself, a hash function is involved. The Hash Generator brings four of the most widely used hash algorithms into a single browser-based tool with support for HMAC authentication and salt-based hashing. A hash function takes any input, from a single character to an entire novel, and produces a fixed-size output called a digest or hash value. The same input always produces the same hash. Changing even one character in the input produces a completely different hash. And critically, hash functions are one-way: given a hash value, it is computationally infeasible to determine what input produced it. These properties make hashing useful for verifying data integrity, storing passwords, detecting duplicate content, and authenticating messages. All hashing operations in this tool use the browser built-in SubtleCrypto API, which provides access to the same cryptographic primitives that secure HTTPS connections.

Type or paste any text into the input field and select a hash algorithm from the available options: MD5 (128-bit), SHA-1 (160-bit), SHA-256 (256-bit), or SHA-512 (512-bit). The hash output appears instantly and updates as you type. Each algorithm produces a different-length hexadecimal string, and you can switch between algorithms to compare their outputs for the same input. For HMAC (Hash-based Message Authentication Code) mode, the tool accepts an additional key input. HMAC combines the hash function with a secret key to produce an authenticated hash that verifies both the message integrity and its origin. Only someone with the correct secret key can generate a valid HMAC for a given message. This is commonly used in API authentication where the client and server share a secret key and the client must prove it knows the key without transmitting the key itself. Salt mode adds a random or user-specified string to the input before hashing. This is essential for password hashing because even if two users choose the same password, salted hashes will be different. Salting prevents attackers from using precomputed rainbow tables to reverse hashes.

Developers need to compute hashes frequently for tasks that range from verifying file downloads to implementing authentication systems. Installing command-line tools or writing scripts for one-off hashing tasks is inefficient. This tool provides immediate access to four algorithms with HMAC and salt support in a single interface, eliminating the need for separate tools or terminal commands. All operations use the browser native Web Crypto API for security and performance, and everything runs locally with no server dependencies.