Hash Generator Online Free
Compute SHA-256, SHA-384, and SHA-512 digests as you type — or switch to the HMAC tab for keyed signatures with a secret. Ideal for checksums, webhook verification, and debugging API auth flows, all locally in your browser.
Utiliio vs CyberChef — Simple Encoding Without ComplexityEverything runs in your browser. Your input is never uploaded, stored, or logged on our servers.
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Related guides
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.
Read guideHMAC vs Hash: What Is the Difference?
Understand when to use a plain hash versus HMAC — and how Utiliio's Hash/HMAC workbench covers both.
Read guideHMAC SHA-256 Generator Online (Free, Private)
Generate HMAC-SHA256 signatures in the Hash/HMAC workbench. SHA-384 and SHA-512 included — secrets never uploaded.
Read guideFrequently asked questions
How do I generate a SHA-256 hash online for free?+
Paste your text into the Hash tab — SHA-256 output updates live. Switch algorithms to SHA-384 or SHA-512. Processing uses the browser Web Crypto API.
What hash algorithms are supported?+
SHA-256, SHA-384, and SHA-512 via the browser Web Crypto API. MD5 is not included because it is cryptographically broken.
Can I generate HMAC signatures here?+
Yes. Switch to the HMAC tab to sign a message with a secret key — used for webhooks, API auth, and JWT HS256 verification.
Is this tool free?+
Yes. Every Utiliio utility is free with no sign-up, usage limits, or paywalls.
Do you store my data?+
No. Processing happens entirely in your browser. Your input never leaves your device.
Can I use this tool offline?+
Yes. Once the page loads, most tools continue working without an internet connection.