Generate MD5, SHA-1, SHA-256, SHA-512 and CRC32 hashes from any text instantly. For checksums and educational use.
A hash generator computes cryptographic hashes (MD5, SHA-1, SHA-256, SHA-512) and the CRC32 checksum of any input text or file. Hashes condense arbitrary input into a fixed-length "fingerprint" that uniquely identifies the input — used for password storage, file integrity verification, blockchain, and digital signatures.
For security-critical applications use SHA-256 or SHA-512. MD5 and SHA-1 are considered broken for cryptographic use (collisions can be found), but remain useful for non-security checksums like detecting file corruption.
Inputs: Input text: "hello"
Collision attacks on MD5 are computationally feasible — researchers can craft two different inputs that produce the same MD5 hash. This breaks the "fingerprint uniqueness" guarantee, so MD5 must not be used for password hashing, digital signatures, or certificate authority chains. For non-adversarial use (file integrity checks where corruption is random, not malicious), MD5 is still fine and faster than SHA-256.
Best practice: never store plaintext passwords. Apply a slow hash function (bcrypt, scrypt, Argon2) with a unique random salt per user. The slow function makes brute-force expensive; the salt prevents pre-computed rainbow tables. Even if the database leaks, attackers cannot easily recover the original passwords. SHA-256 alone is too fast for password storage — designed for speed, which helps the attacker more than the defender.
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