A hash turns any input — a word, a file, a whole book — into a fixed-length fingerprint of hex characters. The same input always gives the same fingerprint, and changing even one letter changes the fingerprint completely.

Can a hash be reversed back to the original text?

No. Hashing is one-way by design: you cannot decode an MD5 or SHA-256 value back into the input. That is why websites store password hashes instead of passwords (properly, with salt and a slow algorithm — a plain fast hash like the ones here is not enough for password storage).

Which hash should I use?

SHA-256 is the everyday standard — it is what checksums, Git commits and most APIs use. MD5 and SHA-1 are fast but broken for security purposes; use them only for non-security checksums and legacy compatibility, never to protect anything.

Is my text uploaded to be hashed?

No. MD5 runs in plain JavaScript on this page and the SHA family runs through your browser's built-in crypto engine. Your text never leaves the tab.

Hash Generator

MD5, SHA-1, SHA-256 and SHA-512 fingerprints of any text — updated live as you type, computed entirely in your browser.

Your text

MD5

SHA-1

SHA-256

SHA-512

Try it: hash a sentence, then change one letter and watch every fingerprint change completely. That avalanche effect is what makes hashes useful for spotting tampering.

How to use it

Type or paste your text. The four hashes update live — no button to press.

Pick your algorithm. SHA-256 for real work; MD5 and SHA-1 for legacy checksums only.

Copy the fingerprint and compare it against the value you were given, or store it as a checksum.

Checksums, fingerprints and tamper alarms

Hashes are the internet's tamper alarm. Download pages publish a SHA-256 next to the file so you can prove the bytes you received are the bytes the author released. Git names every commit by its hash, so history cannot be quietly rewritten. APIs sign requests with keyed hashes so a middleman cannot alter them. All of that rests on two properties you can see on this page: the same input always produces the same output, and the tiniest change to the input scrambles the output beyond recognition.

Hash Generator

How to use it

Checksums, fingerprints and tamper alarms

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