Browser-only tool
SHA-256 hash generator
SHA-256 creates a fixed-length 256-bit fingerprint of text or data. It is commonly used for checksums, content addressing, signatures, and integrity checks.
When To Use SHA-256
Use SHA-256 when you need a stable fingerprint for content integrity, cache keys, file verification, or comparing whether two inputs are exactly the same.
Do not use fast hashes like SHA-256 directly for passwords. Password storage needs a slow password hashing algorithm with salts.
Privacy And Limitations
Text entered into this tool is hashed in your browser with the Web Crypto API and is not uploaded by this static page.
- SHA-256 is not encryption and cannot be decoded back into the original input.
- Do not use a plain SHA-256 hash for password storage. Use Argon2id, bcrypt, or scrypt with a unique salt.
- Identical input always produces the same hash, which is useful for integrity but not secrecy.
FAQ
What is SHA-256 used for?
SHA-256 is used to verify data integrity, compare content fingerprints, build Merkle trees, and support digital signature workflows.
Can SHA-256 be decrypted?
No. SHA-256 is a one-way hash function. You can compare hashes, but you cannot decrypt a hash to recover the input.
Why do two different texts produce different hashes?
SHA-256 is designed so even tiny input changes produce very different outputs, which makes accidental collisions extremely unlikely in practice.
Can I hash files with this page?
This initial version focuses on text input. File hashing can be added as a separate browser feature with chunked reads and file-specific UX.
Should I use SHA-256 alone for passwords?
No. Password storage needs slow password hashing like Argon2id, bcrypt, or scrypt with unique salts, not fast general-purpose SHA-256.