MD4 (Message Digest 4) is a cryptographic hash function designed by Ron Rivest in 1990. It produces a 128-bit hash value. MD4 is the predecessor to MD5 and was influential in hash function design.

No. MD4 is cryptographically broken. Collisions can be found in seconds. It should not be used for security purposes. Use SHA-256 or SHA-3 for secure hashing.

MD4 is used in Windows NTLM authentication (as part of the password hashing process), some legacy systems, and ed2k/eDonkey file hashing. It's important for compatibility with older systems.

MD5 is an improved version of MD4 with additional rounds and operations for better security. Both are now considered insecure, but MD5 is more resistant to collision attacks than MD4.

MD4 produces a 128-bit (16-byte) hash, displayed as 32 hexadecimal characters.

MD4 is needed for NTLM password hash analysis, legacy system compatibility, forensic analysis, and understanding historical cryptographic implementations.

Yes. All computation happens in your browser using JavaScript. Your data never leaves your device.

NTLM uses MD4 to hash Unicode passwords. The password is converted to UTF-16LE and then MD4 hashed. This tool can generate such hashes for testing purposes.

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