diff --git a/Doc/tools/static/rtd_switcher.js b/Doc/tools/static/rtd_switcher.js
new file mode 100644
index 000000000000000..78cbd77e44ad8d4
--- /dev/null
+++ b/Doc/tools/static/rtd_switcher.js
@@ -0,0 +1,82 @@
+ function onSwitch(event) {
+     const option = event.target.selectedIndex;
+     const item = event.target.options[option];
+     window.location.href = item.dataset.url;
+ }
+
+ document.addEventListener("readthedocs-addons-data-ready", function(event) {
+   const config = event.detail.data()
+
+   // Add some mocked hardcoded versions pointing to the official
+   // documentation while migrating to Read the Docs.
+   // These are only for testing purposes.
+   // TODO: remove them when managing all the versions on Read the Docs,
+   // since all the "active, built and not hidden" versions will be shown automatically.
+   let versions = config.versions.active.concat([
+       {
+           slug: "dev (3.13)",
+           urls: {
+               documentation: "https://docs.python.org/3.13/",
+           }
+       },
+       {
+           slug: "3.12",
+           urls: {
+               documentation: "https://docs.python.org/3.12/",
+           }
+       },
+       {
+           slug: "3.11",
+           urls: {
+               documentation: "https://docs.python.org/3.11/",
+           }
+       },
+   ]);
+
+   const versionSelect = `
+   <select id="version_select">
+   ${ versions.map(
+       (version) => `
+       <option
+           value="${ version.slug }"
+           ${ config.versions.current.slug === version.slug ? 'selected="selected"' : '' }
+           data-url="${ version.urls.documentation }">
+           ${ version.slug }
+       </option>`
+   ).join("\n") }
+   </select>
+   `;
+
+   // Prepend the current language to the options on the selector
+   let languages = config.projects.translations.concat(config.projects.current);
+   languages = languages.sort((a, b) => a.language.name.localeCompare(b.language.name));
+
+   const languageSelect = `
+   <select id="language_select">
+   ${ languages.map(
+       (translation) => `
+       <option
+           value="${ translation.slug }"
+           ${ config.projects.current.slug === translation.slug ? 'selected="selected"' : '' }
+           data-url="${ translation.urls.documentation }">
+           ${ translation.language.name }
+       </option>`
+   ).join("\n") }
+   </select>
+   `;
+
+   // Query all the placeholders because there are different ones for Desktop/Mobile
+   const versionPlaceholders = document.querySelectorAll(".version_switcher_placeholder");
+   for (placeholder of versionPlaceholders) {
+       placeholder.innerHTML = versionSelect;
+       let selectElement = placeholder.querySelector("select");
+       selectElement.addEventListener("change", onSwitch);
+   }
+
+   const languagePlaceholders = document.querySelectorAll(".language_switcher_placeholder");
+   for (placeholder of languagePlaceholders) {
+       placeholder.innerHTML = languageSelect;
+       let selectElement = placeholder.querySelector("select");
+       selectElement.addEventListener("change", onSwitch);
+   }
+ });
diff --git a/Doc/tools/templates/layout.html b/Doc/tools/templates/layout.html
index e931147813ae03a..49386120b1600ec 100644
--- a/Doc/tools/templates/layout.html
+++ b/Doc/tools/templates/layout.html
@@ -43,90 +43,7 @@
 {{ super() }}
 
 {%- if not embedded %}
+<script type="text/javascript" src="{{ pathto('_static/rtd_switcher.js', 1) }}"></script>{% endif %}
 <meta name="readthedocs-addons-api-version" content="1">
-<script type="text/javascript">
- function onSwitch(event) {
-     const option = event.target.selectedIndex;
-     const item = event.target.options[option];
-     window.location.href = item.dataset.url;
- }
-
- document.addEventListener("readthedocs-addons-data-ready", function(event) {
-   const config = event.detail.data()
-
-   // Add some mocked hardcoded versions pointing to the official
-   // documentation while migrating to Read the Docs.
-   // These are only for testing purposes.
-   // TODO: remove them when managing all the versions on Read the Docs,
-   // since all the "active, built and not hidden" versions will be shown automatically.
-   let versions = config.versions.active.concat([
-       {
-           slug: "dev (3.13)",
-           urls: {
-               documentation: "https://docs.python.org/3.13/",
-           }
-       },
-       {
-           slug: "3.12",
-           urls: {
-               documentation: "https://docs.python.org/3.12/",
-           }
-       },
-       {
-           slug: "3.11",
-           urls: {
-               documentation: "https://docs.python.org/3.11/",
-           }
-       },
-   ]);
-
-   const versionSelect = `
-   <select id="version_select">
-   ${ versions.map(
-       (version) => `
-       <option
-           value="${ version.slug }"
-           ${ config.versions.current.slug === version.slug ? 'selected="selected"' : '' }
-           data-url="${ version.urls.documentation }">
-           ${ version.slug }
-       </option>`
-   ).join("\n") }
-   </select>
-   `;
-
-   // Prepend the current language to the options on the selector
-   let languages = config.projects.translations.concat(config.projects.current);
-   languages = languages.sort((a, b) => a.language.name.localeCompare(b.language.name));
-
-   const languageSelect = `
-   <select id="language_select">
-   ${ languages.map(
-       (translation) => `
-       <option
-           value="${ translation.slug }"
-           ${ config.projects.current.slug === translation.slug ? 'selected="selected"' : '' }
-           data-url="${ translation.urls.documentation }">
-           ${ translation.language.name }
-       </option>`
-   ).join("\n") }
-   </select>
-   `;
-
-   // Query all the placeholders because there are different ones for Desktop/Mobile
-   const versionPlaceholders = document.querySelectorAll(".version_switcher_placeholder");
-   for (placeholder of versionPlaceholders) {
-       placeholder.innerHTML = versionSelect;
-       let selectElement = placeholder.querySelector("select");
-       selectElement.addEventListener("change", onSwitch);
-   }
-
-   const languagePlaceholders = document.querySelectorAll(".language_switcher_placeholder");
-   for (placeholder of languagePlaceholders) {
-       placeholder.innerHTML = languageSelect;
-       let selectElement = placeholder.querySelector("select");
-       selectElement.addEventListener("change", onSwitch);
-   }
- });
-</script>
 {%- endif %}
 {% endblock %}