Hash Generator

A hash is a fixed-length string generated from input data using a mathematical algorithm. Hashes are used for verifying file integrity (checksums), storing passwords securely, digital signatures, and data deduplication. The same input always produces the same hash.

MD5 produces a 128-bit hash — fast but no longer secure for cryptographic use. SHA-1 produces a 160-bit hash — also considered weak. SHA-256 produces a 256-bit hash and is the current standard for security applications, used in TLS certificates, Bitcoin, and password hashing.

No. Hash functions are one-way — by design, you cannot derive the original input from a hash. However, common short strings can be found via rainbow tables or brute force, which is why passwords should use salted hashing algorithms like bcrypt or Argon2.

MD5 is not safe for security purposes (digital signatures, certificates, password hashing) because collision attacks are practical. However, MD5 is still acceptable for non-security uses like checksums, cache keys, and data deduplication where collision resistance isn't critical.