SHA-256 Hash Generator

Generate a SHA-256 hash from any text.

Text to hash

Use HMAC with a secret key

HMAC proves authenticity as well as integrity.

Uppercase output

Compare against an expected hash

Comparison ignores case.

What does SHA-256 Generator do?

Produce a SHA-256 hash — 256 bits, 64 hexadecimal characters — from any input. SHA-256 is the workhorse of modern integrity checking, used in TLS certificates, Bitcoin, package checksums and digital signatures.

How to Use SHA-256 Generator

1
Enter your textThe hash appears immediately.
2
Choose the output formatHex or Base64.
3
Copy or verifyPaste an expected value to check for a match.

Key Features

Native Web Crypto implementation, identical to server-side output
Uppercase and lowercase hex, plus Base64 output
HMAC-SHA256 with a secret key
Comparison field to verify against an expected hash
Live hashing as you type

Frequently Asked Questions

How long is a SHA-256 hash?

Always 256 bits — 64 hexadecimal characters, or 44 characters in Base64 — regardless of how large the input is. That fixed length is a defining property of a hash function.

Is SHA-256 secure?

Yes, for its intended purposes. No practical collision or preimage attack exists, and it is the default choice for certificates, signatures and integrity checks. It is still unsuitable for password storage because it is fast by design.

Is SHA-256 encryption?

No. Encryption is reversible with a key; hashing is one-way with no key. You cannot decrypt a SHA-256 hash because the original data is not contained in it.

What is HMAC-SHA256?

A keyed hash that proves both integrity and authenticity. Because it requires a secret, only someone holding the key can produce a valid value — which is why it underpins webhook signatures and API request signing.