SHA-256 Hash Generator
Generate SHA-256 hash from any text input. Widely used for security and blockchain applications.
How to use
- 1 Type or paste the text you want to hash into the input field.
- 2 The SHA-256 hash is computed instantly using the Web Crypto API.
- 3 Click Copy to grab the 64-character hex digest.
- 4 Use it for data integrity verification, API signatures, or password hashing verification.
Key features
- Computes SHA-256 hash using the native Web Crypto API
- Instant output — updates as you type
- Produces a 64-character hexadecimal digest
- Industry standard for data integrity and HMAC signatures
What is SHA-256?
SHA-256 is part of the SHA-2 family, designed by the NSA and standardized by NIST in 2001. It produces a 256-bit (64-character hex) digest and is the current gold standard for cryptographic hashing. It underpins TLS 1.3, code signing, blockchain (Bitcoin mines SHA-256 in its proof-of-work), and most modern authentication protocols.
Unlike MD5 and SHA-1, no practical collision or preimage attack against SHA-256 has been found. It remains the default recommendation in NIST guidelines, FIPS 140-2/3, and most security audits. When in doubt, SHA-256 is the right choice.
Common Use Cases
TLS/HTTPS certificates
All modern TLS certificates are signed with SHA-256 or SHA-384. Browsers reject anything weaker.
Cryptocurrency and blockchain
Bitcoin uses double-SHA-256 for block hashing and proof-of-work. It is also used in Merkle trees for transaction verification.
Code signing
Software releases, package manifests, and firmware updates are signed with SHA-256 to prove authenticity.
HMAC authentication
HMAC-SHA256 signs API requests in AWS Signature V4, JWT HS256, and most modern webhook payloads.
Subresource Integrity (SRI)
The sha256- hash in an HTML <script integrity=""> attribute verifies a CDN asset has not been tampered with.
Content-addressed storage
Systems like IPFS, Docker images, and package managers use SHA-256 digests as globally unique content identifiers.
The SHA-2 Family
| Variant | Output | Best for |
|---|---|---|
| SHA-224 | 224 bit / 56 hex | Space-constrained environments, HMAC truncation |
| SHA-256 | 256 bit / 64 hex | General purpose — TLS, APIs, blockchain, tokens |
| SHA-384 | 384 bit / 96 hex | High-security applications, government compliance |
| SHA-512 | 512 bit / 128 hex | Maximum security, faster on 64-bit hardware than SHA-256 |