MD4 hash
Compute an MD4 digest of a file, on your device. MD4 is cryptographically broken, useful only for legacy or forensic work, not integrity or security.
Runs on your device. The file is never uploaded.
MD4 hash reads any file and prints a 128 bit digest as 32 lowercase hex characters, under a line giving the algorithm and the file name. There are no options, so the same bytes always give the same value. Collisions can be built to order, which leaves a match here proving nothing about a file you did not make.
Questions
Is MD4 safe to use?
No. MD4 is cryptographically broken: collisions are easy to produce, so it cannot be relied on for integrity or for anything security related. The tool says as much in its own description. It is here for legacy and forensic work, where you need to reproduce or recognise a value that some older system created.
What does the output look like?
Two lines: the words MD4 hash, then the filename, then the 32-character hex digest on the next line. MD4 produces 16 bytes. There are no options at all, so the same file always gives the same digest, on this site and anywhere else that implements MD4 correctly.
Is this the same as an NT hash?
Not quite. An NT hash is MD4 of a password encoded as UTF-16LE, which the NT hash tool does for you from a typed password. This tool computes MD4 over a file byte for byte. Hashing a text file that contains a password here gives a different value from the NT hash of that password.
How many files can I hash?
As many as you drop. Each file is hashed separately and comes back as its own result with its own filename line. Nothing is combined into a single digest across the set, so this does not give you one value for a folder.
What should I use instead?
Whatever the other side expects. If you are choosing freely, SHA-256 and BLAKE3 are both in Generate all hashes, which computes twenty-four digests in one pass and includes MD4 itself. Use this dedicated tool when you want the MD4 value on its own and nothing else.
Does the file leave my device?
No. hash-wasm runs as WebAssembly in a Web Worker in this tab and reads the file locally. Nothing is uploaded and no digest is kept between runs. The site works offline after the first visit, which matters here because MD4 usually turns up in forensic work on material you would not want to send anywhere.