Compute MD5, SHA-1, SHA-256, and SHA-512 cryptographic hashes from text or files — all processing happens in your browser. No data is ever sent to any server.
d41d8cd9…) and uppercase (D41D8CD9…) output.A cryptographic hash function takes an input of any size and produces a fixed-length output called a digest or hash. The same input always produces the same hash, but any change to the input — even a single character — produces a completely different result. This property, called the avalanche effect, makes hashes useful as tamper-evident fingerprints for data.
Hash functions are one-way: given only the hash, reconstructing the original input is computationally infeasible for secure algorithms. This makes them suitable for verifying data without revealing the data itself. Common real-world applications include verifying software downloads, storing passwords (with salting and key stretching), generating unique identifiers, digital signatures, and blockchain ledgers.
No. Never use raw hash functions (including SHA-256) directly for password storage. Password hashing requires dedicated algorithms like bcrypt, scrypt, or Argon2 that incorporate a random per-user salt and are deliberately slow to resist GPU-based brute-force attacks. An unsalted MD5 password can be reversed in milliseconds using precomputed rainbow tables.
This is the avalanche effect — a fundamental design property of all cryptographic hash functions. Each bit of the input is mixed through multiple rounds of bitwise operations that cause every output bit to depend on every input bit. A change of even one bit cascades through all rounds, randomising the entire output. This ensures that similar inputs produce unrelated hashes, making it impossible to infer information about the original data from the digest.
Use whichever algorithm the publisher provides — most modern projects publish SHA-256 checksums. Compare the hash displayed here against the hash listed on the download page. If they match exactly, the file arrived intact and has not been tampered with. If they differ, the file may be corrupted or modified; do not use it. SHA-512 is equally valid. MD5 and SHA-1 checksums are only reliable for detecting accidental corruption, not intentional tampering.
Yes. All hashing runs in your browser using the built-in SubtleCrypto Web Crypto API (SHA algorithms) and a local MD5 implementation. No input text or file content is transmitted to any server. You can verify this by opening your browser’s DevTools Network tab while using the tool — you will see zero outbound requests containing your input.