OpenSearch Description XML Builder
OpenSearch is the standard format browsers use to recognize a site as a search engine — Firefox and Edge auto-detect, Chrome uses it for the address bar. Generate the XML once, link it from your HTML <head>, and your site appears in browser search settings.
opensearch.xml
Link from your HTML head: <link rel="search" type="application/opensearchdescription+xml" title="My Site" href="/opensearch.xml">