Message Digest 5 produces a 128-bit (32 hex char) fingerprint. Used widely for checksums, file integrity, and legacy password storage.
Secure Hash Algorithm 1 generates a 160-bit (40 hex char) hash. Stronger than MD5 and commonly used in digital signatures & certificates.
Hash functions are irreversible — original text cannot be recovered from the hash. Ideal for secure password comparison & storage.
All hashing is performed on the server using PHP's native md5() & sha1() — instant results, no external API calls.