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diff --git a/content/syewtube_urls/yewtube_urls.js b/content/syewtube_urls/yewtube_urls.js
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+/**
+ * Copyright (C) 2021, Wojtek Kosior
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the CC0 1.0 Universal License as published by
+ * the Creative Commons Corporation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * CC0 1.0 Universal License for more details.
+ * Available under the terms of Creative Commons Zero.
+ */
+
+/* Library to convert youtube.com URLs to yewtu.be URLs. */
+
+function decode_query_options(url)
+{
+ const query_options = {};
+ const match = /^[^?]*\?(.*)/.exec(url);
+ if (!match)
+ return query_options;
+
+ for (const opt of match[1].split("&")) {
+ const [key, val] =
+ /^([^=]*)=?(.*)/.exec(opt).splice(1, 2).map(decodeURIComponent);
+ query_options[key] = val;
+ }
+
+ return query_options;
+}
+
+function encode_query_options(query_options)
+{
+ return Object.entries(query_options)
+ .map(ar => ar.map(encodeURIComponent).join("=")).join("&");
+}
+
+function make_yewtube_url(youtube_url)
+{
+ const query_options = decode_query_options(youtube_url);
+
+ let endpoint = "";
+
+ const match = /^(?:(?:https?:)?\/\/)?[^/]*\/([^?]*)/.exec(youtube_url);
+ if (match)
+ endpoint = match[1];
+
+ if (/^embed\//.test(query_options.v))
+ endpoint = query_options.v;
+
+ if (/^embed\/.+/.test(endpoint))
+ delete query_options.v
+
+ const encoded_options = encode_query_options(query_options);
+ return `https://yewtu.be/${endpoint}?${encoded_options}`;
+}