Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text. All computation runs locally in your browser.
Free Online Hash Generator
Generate cryptographic hash values from any text using MD5, SHA-1, SHA-256, SHA-384, and SHA-512 algorithms. Hashing converts input of any length into a fixed-length string that uniquely represents the data. This tool uses the Web Crypto API built into your browser — no data is ever sent to a server.
Hash Algorithms Compared
MD5 produces a 128-bit (32 character) hash. It's fast but considered cryptographically broken — use only for checksums, not security. SHA-1 produces a 160-bit (40 character) hash. Also deprecated for security use but still common in legacy systems. SHA-256 produces a 256-bit (64 character) hash. The current standard for most security applications, used in SSL certificates, blockchain, and password hashing. SHA-512 produces a 512-bit (128 character) hash with the highest security level in this tool.
Common Use Cases
Verifying file integrity by comparing checksums before and after transfer. Password hashing (though production systems should use bcrypt, scrypt, or Argon2 with salting). Data deduplication by identifying identical content. Digital signatures and certificate verification. Blockchain and cryptocurrency operations.
Frequently Asked Questions
No. Cryptographic hashes are one-way functions — there is no mathematical way to reverse them. You can only verify if a given input produces the same hash. "Reversing" a hash requires brute-force guessing, which is computationally infeasible for strong inputs.
MD5 is not safe for cryptographic purposes (passwords, signatures, certificates) because collision attacks have been demonstrated. However, MD5 is still acceptable for non-security checksums, like verifying file downloads or detecting accidental data corruption.
For general-purpose hashing and security: SHA-256. For maximum security: SHA-512. For file checksums where speed matters and security isn't critical: MD5. For passwords in production: none of these — use bcrypt, scrypt, or Argon2 instead.