Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes simultaneously using the Web Crypto API.
Tips
- SHA-256 is the recommended hash for most modern applications (TLS, Git, Bitcoin).
- MD5 and SHA-1 are cryptographically broken. Use them only for non-security checksums.
- For password hashing, use bcrypt, scrypt, or Argon2id instead of general-purpose hashes.
- All computation runs locally via Web Crypto API. No data is sent to any server.
Understanding Cryptographic Hash Functions
A cryptographic hash function takes any input and produces a fixed-size output (the digest). The same input always yields the same hash, but even a single-bit change produces a completely different output (the avalanche effect). This makes hashes ideal for data integrity verification, digital signatures, and password storage.
MD5 (128-bit) was designed in 1991 and remains common for checksums, but is cryptographically broken. Practical collision attacks exist, so it should never be used for security. SHA-1 (160-bit) was the standard until a collision was demonstrated in 2017. It is now deprecated for certificates and signatures.
SHA-256 and SHA-512 belong to the SHA-2 family and are considered secure today. SHA-256 is used in TLS, Bitcoin, and many authentication systems. SHA-512 provides a higher security margin and can be faster on 64-bit hardware due to its native word size.
This tool uses the Web Crypto API for SHA algorithms (hardware-accelerated in most browsers) and a pure JavaScript MD5 implementation (Web Crypto intentionally excludes MD5 due to its insecurity). All computation runs client-side.
For password hashing, general-purpose hash functions like SHA-256 are too fast. Use specialized slow algorithms like bcrypt, scrypt, or Argon2id that include salting, configurable cost parameters, and memory-hardness.