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Free tool · runs in your browser

SHA-256 hash generator

Paste anything below. The SHA-256 digest updates as you type. The text never leaves this page — the hash is computed locally with window.crypto.subtle.digest.

b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9

About SHA-256

SHA-256 is the most common cryptographic hash function on the modern web. Used in TLS certificates, Bitcoin, Git, Docker image digests and pretty much every "integrity-check" workflow you can name.

  • Produces a 256-bit (32-byte) digest, rendered as 64 hex characters.
  • Designed by the NSA, published as part of FIPS 180-4 in 2002.
  • No known practical collisions. Considered safe for integrity checks and message authentication.

Common use cases

  • Verify a file you downloaded matches a published checksum.
  • Generate cache keys from request bodies.
  • Sign or verify HMAC payloads (use a key + SHA-256).
  • Index immutable objects in content-addressed storage.

Same hash via API

If you need to compute SHA-256 from a server or in another language, hit the Oxide Hash & Encryption Toolkit — same algorithm, sub-5 ms at the edge, free tier available.

curl -X POST https://hash-toolkit1.p.rapidapi.com/v1/hash \
  -H "Content-Type: application/json" \
  -H "X-RapidAPI-Key: YOUR_KEY" \
  -H "X-RapidAPI-Host: hash-toolkit1.p.rapidapi.com" \
  -d '{"algorithm":"sha256","input":"hello world"}'

FAQ

What is SHA-256?

SHA-256 is the most common cryptographic hash function on the modern web. Used in TLS certificates, Bitcoin, Git, Docker image digests and pretty much every "integrity-check" workflow you can name.

How many characters is a SHA-256 hash?

SHA-256 produces a 256-bit digest, which renders as exactly 64 hexadecimal characters or 43 base64 characters.

Is this SHA-256 tool secure?

Yes — the hash is computed entirely in your browser using the built-in Web Crypto API (window.crypto.subtle.digest). The text you paste never leaves your machine, and nothing is logged on our end.

Can I hash SHA-256 from an API?

Yes. The Oxide Hash & Encryption Toolkit exposes /v1/hash with algorithm:"sha256" so you can compute the same hash from a server with sub-5 ms latency at the network edge.