Generate MD5, SHA-1, SHA-256, and SHA-512 hashes instantly
A hash function takes any input — a word, a document, a 4 GB file — and produces a fixed-length fingerprint from it. The same input always yields exactly the same hash, but change even one character and the output changes completely and unpredictably. Crucially, the process is one-way: a hash cannot be reversed to reveal the input that produced it.
The everyday use is verification. Software publishers list the SHA-256 hash of their installers; hash your downloaded copy and compare — a match proves the file arrived intact and untampered, byte for byte. The same technique confirms that a backup equals its original or that two files are truly identical without comparing their contents manually. This is also the mechanism behind password storage: services store hashes of passwords rather than the passwords themselves.
Algorithm choice matters. MD5 and SHA-1 are historic algorithms with known weaknesses — attackers can construct two different files sharing the same hash — so they survive only for compatibility and casual checksums. SHA-256 and SHA-512, the SHA-2 family, remain secure standards for anything that matters. Everything this tool hashes, including files, is processed locally in your browser and never uploaded.
Mostly integrity checking: verifying a downloaded file matches what the publisher released, confirming two files are identical, or detecting that something changed. Developers also use hashes as identifiers and in digital signatures — and password systems store hashes so the passwords themselves never sit in a database.
SHA-256 is the sensible default: secure, fast, and universally supported. Use SHA-512 when a system asks for it. Use MD5 or SHA-1 only when matching a value that was published in that format — they are considered broken for security purposes.
No — hashing is not encryption and there is no key to decrypt with; the transformation discards information irreversibly. What attackers can do is guess candidate inputs, hash them, and compare against a target, which succeeds against weak inputs like common passwords. That is guessing, not reversing.
Find the official hash on the publisher’s site, hash your downloaded file here with the same algorithm, and paste the official value into the comparison field. An exact match confirms integrity; any difference means the file is corrupted or has been altered and should not be run.
No. The file is read and hashed by your browser on your own device — nothing is transmitted. Hashing even sensitive documents here is safe, and large files simply take a little longer.