Docs / Utility
UrlEncode is an AMPscript function in the utility category.
UrlEncode(str, [spacesAsPlus], [encodeAll])
%%=UrlEncode("name=Ada L&tier=Gold")=%%
name%3DAda%20L%26tier%3DGold
Output produced by AmpSend's AMPscript engine (validated against Salesforce's own test corpus) - not a hand-written result.
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UrlEncode in the official AMPscript reference - or browse the official index of AMPscript functions for platform behavior and edge cases.