Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes. Free online hash generator.
Hash a File
Select a file to compute its hash (file stays in your browser)
Frequently Asked Questions
What is a hash function?
A hash function takes input data of any size and produces a fixed-size output (the hash). The same input always produces the same hash, but even a tiny change to the input produces a completely different hash. Hash functions are one-way โ you cannot reverse a hash to get the original input.
What's the difference between MD5 and SHA?
MD5 produces a 128-bit hash (32 hex characters) and is fast, but is considered cryptographically broken โ collisions can be found in seconds. SHA-256 produces a 256-bit hash (64 hex characters) and is currently secure. SHA-512 produces a 512-bit hash. For security purposes, always use SHA-256 or stronger.
What are hashes used for?
Hashes are used for: verifying file integrity (checking if a file has been modified), password storage (storing hashes instead of plain text), digital signatures, data deduplication, and blockchain/cryptocurrency. File checksums (like SHA-256 of a download) let you verify the file wasn't corrupted or tampered with.
Can I decrypt a hash?
No, hashes are one-way functions โ they cannot be decrypted. The only way to "crack" a hash is through brute force (trying every possible input) or rainbow tables (precomputed hash lookups). This is why strong passwords and salted hashes are important for security.
How does the file hashing work?
When you select a file, it's read entirely in your browser using the File API. The file content is hashed using the Web Crypto API. The file is never uploaded to any server โ everything happens locally on your device.
Is this tool free?
Yes, completely free with no sign-up required. All hashing happens in your browser using the Web Crypto API.