SHA-256 Hash Generator Online Free — Hash & HMAC Workbench
Generate SHA-256, SHA-384, and SHA-512 hashes online with live output. HMAC tab for webhook signatures — free, private, Web Crypto API.
Cryptographic hashes produce a fixed-length fingerprint of input data. SHA-256 is widely used for checksums and integrity verification — hashing is one-way, not encryption. Never use plain SHA-256 alone to store passwords; use dedicated password hashing algorithms in production.
How to generate SHA-256 online for free
- Paste text into the Hash tab — SHA-256 output updates as you type
- Switch to SHA-384 or SHA-512 from the algorithm selector
- Use the HMAC tab when a secret key is involved (webhooks, API signatures)
- Copy the digest or share a link — input stays in your browser
Hash vs HMAC — when to use which
- Plain hash — checksums, comparing file integrity, deterministic fingerprints
- HMAC — Stripe/GitHub webhooks, signed API requests, JWT HS256 verification
- HMAC requires a secret — never paste production secrets into server-side tools
Hash workbench features
- Live SHA-256, SHA-384, and SHA-512 via Web Crypto API
- HMAC tab on the same page — no separate tool needed
- Shareable links with algorithm and tab preserved
- 100% client-side — inputs never uploaded