About this utility
How to use HMAC Generator
Authenticate text with a shared secret and SHA-2 HMAC.
What to provide
The message is encoded as UTF-8.
Secrets are used only for the current run and are never stored or transmitted.
- Paste, type, or drag and drop a supported text file into the input area.
- Place the second value or file in the adjacent panel. Sensitive fields are masked by default.
- Choose the options that match your intended result.
- Select “Run tool” or press Ctrl/Command + Enter, then copy, download, or move the result back into the first input for another pass.
Use “Swap inputs” to reverse the comparison without copying either value.
What the result means
A lowercase hexadecimal HMAC.
Privacy and safety
This utility is loaded as browser code and processes your input only in this tab. OmniCastConverter has no upload endpoint and never stores your content, filenames, tokens, or secrets. Generated markup and code are shown as inert text and are never executed.
Limitations
- Both parties must already share and protect the same secret.
Try the included example
Select “Load example” at any time to restore this tested sample.
order=42&total=19.95local-secret