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MD4 Hash Generator
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Generate MD4 message digests online with support for multiple input formats, salt, iterations, and encoding options.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
MD4 is a legacy message-digest algorithm. It maps an input message to a fixed 128-bit result, usually displayed as 32 hexadecimal characters. A digest is not ciphertext: there is no decryption step that restores the original text.
The generator accepts text and shows the digest in lowercase hexadecimal, uppercase hexadecimal, and Base64 representation. These are different encodings of the same digest bytes. For example, RFC 1320 publishes test vectors; the MD4 digest of abc is a448017aaf21d8525fc10ae87aa6729d. Use a published vector to check compatibility with a legacy implementation.
The IETF moved the MD4 specification to Historic status. MD4 has serious cryptographic weaknesses and is unsuitable for password storage, new digital signatures, or security-sensitive integrity checks. Generating a digest successfully does not make the algorithm secure. Use MD4 only when a system you must interoperate with explicitly requires it; for new designs, follow current security guidance and use an appropriate modern construction.
The same exact input produces the same digest with the same algorithm. A changed character, space, or line break changes the message being hashed, so check copied text carefully when matching a legacy value.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Paste or type the message. Include any spaces, punctuation, and line breaks that are part of the original input.
Compare lowercase hex, uppercase hex, or Base64 according to the legacy system’s expected representation. Case matters only for the text representation, not the underlying digest bytes.
For a compatibility check, try abc and compare the hexadecimal output with the RFC 1320 test vector shown above.
Use cases
See how the tool fits into real work and everyday tasks.
A maintainer can calculate a digest for test text when checking a dependency or stored value that is explicitly defined to use MD4.
A learner can compare hexadecimal and Base64 representations and observe that both encode the same fixed-length digest output.
Q&A
Find concise answers to common questions and confusing cases.
No. MD4 is a one-way digest function, not an encryption scheme. The output does not contain a reversible copy of the input.
No. Do not use MD4 for password storage or new security designs. Passwords require a purpose-built password-hashing scheme with appropriate parameters.
The actual input may differ by whitespace, line endings, or characters. Confirm that the text is identical and that you are comparing the same output representation.
Notes
Review scope, result limitations, and important precautions before use.
This generator is for legacy compatibility and learning. Its output is not a security guarantee.
Do not use MD4 to protect passwords, authenticate new data, or establish trust in files or messages. A matching MD4 result cannot rule out deliberate substitution or collision attacks. Follow the requirements of the system you are maintaining and have security-sensitive designs reviewed against current standards.
Related
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