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Hashing is a cryptographic process that converts input data into a fixed-length string of characters called a hash. The same input always produces the same hash, making it useful for data integrity verification and security applications.
MD5 produces 128-bit hashes but is cryptographically broken. SHA1 produces 160-bit hashes but has vulnerabilities. SHA256 (part of SHA-2) produces 256-bit hashes and is currently considered secure for most applications. SHA3 is the newest standard.
Common uses include: password storage and verification, data integrity checking, digital signatures, file fingerprinting to detect tampering, blockchain transactions, and checksums for downloads.
No, cryptographic hashes cannot be reversed. This is called a one-way function. You cannot retrieve the original data from a hash. This is why they're secure for password storage.
Yes, SHA256 is currently considered secure and is widely used in security applications, cryptocurrency, and digital signatures. It's recommended for most modern applications.
Yes, completely free! Generate unlimited hashes with all supported algorithms instantly. All processing happens in your browser for maximum privacy.