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Free online hash generator — compute MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes instantly. Built-in Web Crypto for secure computation.
A cryptographic hash function is a deterministic algorithm that takes an input (message) of arbitrary size and produces a fixed-size output (hash or digest). Hash functions are fundamental to modern computing — used for password storage, data integrity verification, digital signatures, file fingerprinting, and blockchain technology.
MD5 (Message Digest 5) produces a 128-bit (32-character) hash. It was once widely used but is now considered cryptographically broken — collision attacks can produce the same MD5 hash from different inputs. MD5 should never be used for security purposes, though it remains useful for non-security checksums like file integrity verification against accidental corruption.
SHA-1 produces a 160-bit (40-character) hash. Like MD5, SHA-1 has been deprecated due to collision attacks (the SHAttered attack demonstrated this in 2017). Modern systems should use SHA-256 or SHA-512, which belong to the SHA-2 family and remain secure for all practical purposes.
SHA-256 produces a 256-bit (64-character) hash and is the current industry standard. It is used in TLS/SSL certificates, blockchain (Bitcoin), code signing, and most security-sensitive applications. SHA-512 offers stronger security with a 512-bit (128-character) output and is faster on 64-bit processors.
Choosing the right hash: Use SHA-256 or SHA-512 for security (file integrity, signatures). Use MD5 or SHA-1 only for non-security purposes (deduplication, non-critical checksums). For password storage, never use plain hashes — always use a password hashing function like bcrypt, argon2, or scrypt with a salt.
No for security, yes for non-security checksums. MD5 is cryptographically broken — attackers can deliberately create collisions. However, for checking accidental file corruption or data integrity (not against malicious attacks), MD5 is still acceptable.
SHA-256 produces a 256-bit hash (64 hex chars) with 128-bit collision resistance. SHA-512 produces a 512-bit hash (128 hex chars) with 256-bit collision resistance. SHA-512 is actually faster on 64-bit processors but uses more bandwidth. Both are currently secure.
No. Hash functions are one-way by design. The only way to 'reverse' a hash is through brute-force (trying all possible inputs) or using rainbow tables (pre-computed hash databases). This is why password hashing requires slow algorithms and salts to prevent such attacks.