Sign a message with a secret
The signature scheme webhooks use, so you can check what a provider sent you actually came from them.
Drop a file here, or , or type below.
.txt · .md · .html · .csv · up to 4 MB · processed in memory and never stored · or paste with ⌘V
The shared secret. Never logged, never echoed back.
1 credit
Needs Key.
Doing this a lot?
Same tool, as an API.
This page calls exactly the same code you would from your own program — no daily cap, 1 credit per call. See the endpoint reference.