HMAC Generator
Developer ToolsHMAC-SHA family + Hex/Base64
Quick Answer
HMAC Generator: HMAC-SHA family + Hex/Base64. HMAC Generator uses standard developer formulas to compute accurate results instantly.
Common use cases
| API request signing | message + timestamp + key → server recomputes to verify |
| Webhook verification | GitHub/Stripe X-Signature header |
| JWT HS256 | HMAC-SHA-256(header.payload, secret) |
| Tamper-proof tokens | user_id:signature format |
HMAC proves both integrity and authenticity when the two parties share a secret. Prefer SHA-256 or above; HMAC-SHA-1 is still safe against forgery but discouraged for new systems. Never reuse the same secret across services, rotate keys periodically, and compare signatures with a constant-time function to avoid timing attacks. Everything runs locally in your browser.
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How to Use
- Paste or type content: drop code/text into the HMAC Generator or fill the parameters.
- Choose mode/options: switch format, rules or processing as needed.
- Live output: results appear instantly — nothing is submitted, data stays in your browser.
- One-click copy: copy the output straight into your development environment.
Key Points
- HMAC Generator is a free online developer tool — open and use, no sign-up.
- All calculations run locally in your browser; your data never leaves the device.
- Key capability: HMAC-SHA family + Hex/Base64.
- Results come with formulas and reference tables so you can verify every number.
Formula & How It Works
HMAC Generator formula
HMAC Generator uses standard developer formulas to compute accurate results instantly.
FAQ
How do I use the HMAC Generator?
Open the page and fill in the input fields — results update automatically. HMAC-SHA family + Hex/Base64.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.
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Source & Updates
Based on RFC 4648, ECMA-262 and related specifications. Last updated: 2025-07
Authoritative sources:
Last updated:
Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.
Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.
Cite this page: YiJianSuan. HMAC Generator[EB/OL]. https://www.yijiansuan.com/en/c/dev/hmac
Results provided by this tool are for reference only and do not constitute professional advice.