MD4 Hash Generator

Generate an MD4 hash for a string of text. Enter the text to hash and produce the 32-character hexadecimal message digest.

Question

What is MD4?

MD4 is a cryptographic hash function designed by Ronald Rivest and published by the IETF in RFC 1320. It produces a 128-bit message digest that is commonly written as 32 lowercase hexadecimal characters.

This tool hashes the text you enter as UTF-8 bytes and writes the resulting MD4 digest to the output box without sending the text to a server. Whitespace, punctuation, letter case, and non-ASCII characters all affect the result, so compare the output only with systems that hash the same text encoding.

MD4 is obsolete for security-sensitive use. RFC 6150 moved MD4 to Historic status because practical collision attacks and other cryptanalytic weaknesses mean MD4 no longer provides modern cryptographic security. Use it only for legacy test vectors, old application compatibility, or educational comparisons; do not use MD4 for passwords, signatures, certificates, integrity protection, message authentication, or new cryptographic designs.

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