Hash Generator

Hash Generator
Hash Functions Info
MD5 (128-bit) Fast but cryptographically broken. Use only for non-security purposes.
SHA1 (160-bit) Deprecated for cryptographic use. Suitable for data integrity checks.
SHA256 (256-bit) Current standard for secure hashing. Recommended for most applications.
SHA512 (512-bit) Highest security level. Best for sensitive applications.
Use Cases
  • Password Storage (with salt)
  • File Integrity verification
  • Digital Signatures
  • Data Deduplication
  • Checksum Generation

Choosing a Hash Algorithm

All hashing here runs in your browser through the Web Crypto API - nothing you paste is transmitted. The algorithm choice matters more than the tool: MD5 and SHA-1 are broken for security purposes (collisions are practical to produce) and survive only as checksums and for legacy compatibility, while SHA-256 is the sane default for everything else. How exactly MD5 and SHA-1 fell is a good story - it is told in hashing algorithms: from MD5 to SHA.

One boundary trips people up constantly: a plain hash proves integrity, not authenticity, and it is not how you store passwords either - that job needs a slow, salted KDF like bcrypt or Argon2. To authenticate a message with a shared secret, use HMAC rather than hashing the secret together with the data.

Related Tools

HMAC Generator Password Generator JWT Decoder/Encoder Base64 Encoder/Decoder

Hash Questions

Hashes turn any input into a fixed-length fingerprint. Same input = same hash, always. Useful for verifying file integrity, storing passwords (never store plaintext!), deduplicating data, and lots more.

For anything security-related, SHA-256 or SHA-512. MD5 and SHA-1 have known weaknesses - fine for checksums, not for security. For actual password storage, you'd want bcrypt or Argon2, but those need server-side code.

For security, yes - collision attacks are practical now. For checksums or cache keys where you don't care about malicious collisions? Still works fine. Just don't use it for passwords or signatures.

Nope, that's the point. Hashes are one-way by design. But weak passwords can be cracked via rainbow tables or brute force - another reason to use long, random passwords.