SHA-256 Generator

Fingerprint text or files with SHA-256.

Free SHA-256 hash generator. Hash text or files up to 100 MB to a hex digest using your browser's built-in crypto, nothing is uploaded.

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About SHA-256 Generator

A SHA-256 hash is a digital fingerprint: feed in any text or file and you get back a fixed 64-character string that uniquely represents that input. Change even a single character and the fingerprint changes completely. Developers use these fingerprints to verify that a downloaded file matches the original, to confirm data hasn't been tampered with, and to store passwords safely, the hash is checked at login, so the real password never needs to be kept.

This tool generates SHA-256 digests with your browser's built-in, audited cryptography, and it accepts files up to 100 MB. Choose Text to fingerprint a password, a code snippet, or any string, or File to hash a download and compare it against the checksum published by the software's author. If the two digests match exactly, the file is intact.

Two things trip people up. First, hashing is not encryption: a hash can't be "decrypted" back into the original, it's a one-way function, which is exactly why it's safe for password checks. Second, whitespace counts. A trailing newline or an invisible space produces a totally different digest, so when a checksum doesn't match, check for stray characters before assuming the file is corrupt.

How to use SHA-256 Generator

  1. Choose Text or File input.
  2. Type your text or pick a file, then click Generate SHA-256.
  3. Copy the hex digest.

Why use this tool?

  • Uses the browser's native, audited crypto API
  • Files up to 100 MB hashed locally
  • One-way fingerprint

Tips for best results

  • Compare downloads: paste the publisher's published checksum next to the generated digest and compare the full string, not just the first few characters.
  • Hash before and after: fingerprint a file before sending it and have the recipient hash their copy, matching digests prove nothing changed in transit.
  • Mind the whitespace: trailing newlines and spaces change the hash; if a digest doesn't match, strip invisible characters first.
  • Never try to 'decrypt' a hash: SHA-256 is one-way by design; use it for verification, never as reversible encryption.
  • Hashing runs entirely in your browser, so files never leave your device, safe for contracts, keys, and private data.

Frequently asked questions

Is my file uploaded?
No. The file is read and hashed locally in your browser; nothing is sent anywhere.
Can I reverse a SHA-256 hash?
No. SHA-256 is a one-way function, the digest cannot be turned back into the original input, which is what makes it suitable for password verification.
Why does it say the crypto API is blocked?
Browsers only expose the crypto API on secure pages. Open this tool over HTTPS and try again.
SHA-256 or SHA-512, which should I use?
Both are secure today. Use whichever digest the publisher or system you're verifying against provides; SHA-512 gives a longer 128-character digest if you want extra margin.
Why do two identical files give the same hash?
That's the point: the same input always produces the same digest, so matching hashes prove two files are byte-for-byte identical.

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