A cryptographic hash function takes any input — text, a file, anything — and produces a fixed-length string of characters that acts as a unique "fingerprint" of that data. The same input always produces the same hash, but even a tiny change to the input produces a completely different hash. Hashes are one-way: you can't reverse a hash back into the original input.

• Type or paste the text you want to hash.
• Click "Generate Hashes" to instantly see MD5, SHA-1, SHA-256, and SHA-512 versions.
• Click the copy icon next to any hash to copy it.

Verifying File Integrity

Downloaded files are often published alongside a hash (checksum). After downloading, you can hash the file yourself and compare it to the published value to confirm the file wasn't corrupted or tampered with in transit.

Storing Passwords Securely

Well-designed systems never store user passwords in plain text — instead, they store a hash of the password. When you log in, the system hashes what you entered and compares it to the stored hash, note that production systems use specialized password hashing algorithms like bcrypt rather than general-purpose hashes like MD5 or SHA-256 for this purpose.

Detecting Duplicate Data

Hashing large files or datasets makes it fast to check whether two pieces of data are identical, without comparing them byte-by-byte.

MD5 and SHA-1 are fast but are considered cryptographically broken for security-sensitive purposes (though still fine for simple integrity checks). SHA-256 and SHA-512 are currently considered secure and are the standard choice for most modern applications requiring cryptographic hashing.

Can a hash be reversed back to the original text?
Not directly — that's the whole point of a cryptographic hash. However, weak or short inputs can sometimes be found via lookup tables of precomputed hashes, which is why hashing alone isn't a substitute for proper password security measures like salting.

Is my text sent to your server?
No, all hashing on this page happens server-side per request only for the calculation and is not logged or stored afterward.