Docs / String
StringToHex is an AMPscript function in the string category. UTF-8 bytes as hex.
StringToHex(str)
%%=StringToHex("Amp")=%%
416d70
Output produced by AmpSend's AMPscript engine (validated against Salesforce's own test corpus) - not a hand-written result.
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StringToHex in the official AMPscript reference - or browse the official index of AMPscript functions for platform behavior and edge cases.