Online MD5 Hash Generator (Supports HMAC)

MD5 Online Hash Generator

Input String

HMAC Key (Optional)

Output Format:

Lowercase (32 characters)

Uppercase (32 characters)

Lowercase (16 characters)

Uppercase (16 characters)

MD5 Hash Value

Tool Description

MD5 (Message-Digest Algorithm 5) is a widely used cryptographic hash function that converts any length of byte string into a 128-bit large integer, typically represented as a 32-digit hexadecimal number. MD5 is primarily used to ensure data integrity during transmission, such as file checksums.

Security Warning

MD5 has been proven to have serious security vulnerabilities (collision attacks) and therefore **must not** be used for password storage, digital signatures, or any other high-security scenario. Use stronger algorithms like SHA-256 instead.

Standard MD5: Perform standard MD5 hash calculation on the input string.
HMAC-MD5: If a key is provided, the tool will calculate a Hash-based Message Authentication Code (HMAC). This is a keyed-hash method used to simultaneously verify data integrity and authenticate the message source.