Hash Generator

SHA-256, and what it is not

The button hashes the text with SHA-256 through crypto.subtle.digest and prints the digest as 64 lowercase hex characters. The NIST test vector is included so you can check the page: the input abc (no newline) is ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad. An empty string is e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855. The same input always produces the same digest. A one-character change produces a different digest. You cannot recover the text from the digest on this page. Compare two drafts by hashing each one: if the hex matches, the text matches, including spaces. That is a fingerprint, not a diff. Use the text diff page when you need to see which line changed.

MD5 is not offered. The hash is not a password hash: there is no salt and no slow key-derivation function. Do not store passwords by pasting them here and saving the hex. UTF-8 bytes are hashed, so abc and abc followed by a newline are different, and ₹ is hashed as its UTF-8 bytes. The digest is not a UUID and not a checksum of a file you did not paste.

Press Generate SHA-256. The box does not hash on each keystroke. A Web Crypto failure shows the error and clears the digest. Copy prints the hex only. Nothing is uploaded.

How to use it

1. Paste the exact text, including spaces. A trailing newline changes the digest.
2. Press Generate SHA-256 and wait for the hex line.
3. Compare abc with the test vector above if you are checking the browser.
4. Use the digest as a fingerprint of that text. Do not use it as a password store or as proof of a file you did not hash.

The text stays in this browser tab. GetFixMyFile does not upload it, store it, or include it in analytics.