Gerador de Hash
Codificação e Criptografia · Ferramenta online gratuita
Gerar hashes MD5, SHA-1, SHA-256, SHA-512.
Click "Generate" to compute the SHA-256 hash...Com Web Crypto
SHA-1/256/384/512 usam a API nativa crypto.subtle — rápida, acelerada por hardware e auditada.
MD5 Incluído
MD5 é implementado em JavaScript puro (RFC 1321), pois o Web Crypto não o suporta mais. Útil para checksums legados.
Compatível com UTF-8
A entrada é codificada como UTF-8 via TextEncoder — caracteres CJK e emoji produzem hashes consistentes entre plataformas.
Como usar Gerador de Hash
- 1Enter or paste your data into the input field.
- 2Select the desired encoding, hashing, or encryption options.
- 3Click the action button to process your data.
- 4Copy the result from the output field.
Recursos
- ✓100% gratuito — sem cadastro, sem assinatura, sem anúncios
- ✓Funciona inteiramente no navegador — seus dados nunca saem do seu dispositivo
- ✓Rápido e leve — resultados instantâneos
- ✓Multiplataforma — funciona em computador, tablet e celular
O que é Gerador de Hash?
Cryptographic hashing is a one-way function that maps input data of any size to a fixed-length digest. Defined by NIST FIPS 180-4 (SHA family) and RFC 1321 (MD5), hashing is deterministic, fast to compute, and infeasible to reverse. Common algorithms: MD5, SHA-1, SHA-256, SHA-512.
Como funciona Gerador de Hash?
The input is padded and split into fixed-size blocks. Each block is processed through a compression function that updates an internal state. The final state is output as the hash digest. The avalanche effect ensures changing one bit changes ~50% of output bits.
Casos de uso comuns
- ✓File integrity — verify downloads match expected checksums
- ✓Password storage — store hashes (with salt) instead of plaintext
- ✓Git commit IDs — SHA-1 hashes identify commits
- ✓Data deduplication — identical data produces identical hashes
MD5 vs SHA-256
MD5 (128-bit, RFC 1321) is broken for security purposes — collisions can be found in seconds. It remains acceptable for non-security checksums. SHA-256 (256-bit, FIPS 180-4) is cryptographically secure and recommended for all security applications including password hashing (with bcrypt/Argon2 preferred) and digital signatures.
Segurança e privacidade
This tool runs entirely in your browser. For password storage, NEVER use plain MD5 or SHA — use bcrypt, scrypt, or Argon2 with a unique salt per user. Hashing is one-way; you cannot recover the original input from a hash.
Detalhes técnicos
MD5: 128-bit (RFC 1321), broken. SHA-1: 160-bit (FIPS 180-4), deprecated for security. SHA-256: 256-bit, recommended. SHA-512: 512-bit, 64-bit optimized. Output is hexadecimal (0-9, a-f). HMAC (RFC 2104) combines a key with a hash for message authentication. Avalanche effect: 1-bit input change → ~50% output bits change.
Perguntas frequentes
Can I reverse a hash to get the original?
No. Hashing is one-way by design. You can only verify if a given input produces the same hash (verification), not recover the input from the hash.
Is MD5 safe for passwords?
No. MD5 is broken and fast to brute-force. Use bcrypt, scrypt, or Argon2 with per-user salts for password storage.
What is HMAC?
HMAC (Hash-based Message Authentication Code, RFC 2104) combines a secret key with a hash function to verify both data integrity and authenticity. It is used in API signing (e.g., AWS SigV4).
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