diff --git a/docs/pages/i18n/+Page.mdx b/docs/pages/i18n/+Page.mdx
index 35c8f91b373..060adf4ff66 100644
--- a/docs/pages/i18n/+Page.mdx
+++ b/docs/pages/i18n/+Page.mdx
@@ -9,6 +9,7 @@ For example:
 
 export { onBeforeRoute }
 
+import { modifyUrl } from 'vike/modifyUrl'
 import type { Url } from 'vike/types'
 
 function onBeforeRoute(pageContext) {
@@ -38,8 +39,7 @@ function extractLocale(url: Url) {
   const pathnameWithoutLocale = /* ... */
 
   // Reconstruct full URL
-  const { origin, searchOriginal, hashOriginal } = url
-  const urlWithoutLocale = `${origin || ''}${pathnameWithoutLocale}${searchOriginal || ''}${hashOriginal || ''}`
+  const urlWithoutLocale = modifyUrl(url.href, { pathname: pathnameWithoutLocale })
 
   return { locale, urlWithoutLocale }
 }
diff --git a/examples/i18n/locales/extractLocale.js b/examples/i18n/locales/extractLocale.js
index 6bcf59e4c10..81aee0dc71e 100644
--- a/examples/i18n/locales/extractLocale.js
+++ b/examples/i18n/locales/extractLocale.js
@@ -2,20 +2,20 @@ export { extractLocale }
 
 import { locales, localeDefault } from './locales'
 
-function extractLocale(url) {
-  const urlPaths = url.split('/')
+function extractLocale(urlPathname) {
+  const path = urlPathname.split('/')
 
   let locale
-  let urlWithoutLocale
+  let urlPathnameWithoutLocale
   // We remove the URL locale, for example `/de-DE/about` => `/about`
-  const firstPath = urlPaths[1]
-  if (locales.filter((locale) => locale !== localeDefault).includes(firstPath)) {
-    locale = firstPath
-    urlWithoutLocale = '/' + urlPaths.slice(2).join('/')
+  const first = path[1]
+  if (locales.filter((locale) => locale !== localeDefault).includes(first)) {
+    locale = first
+    urlPathnameWithoutLocale = '/' + path.slice(2).join('/')
   } else {
     locale = localeDefault
-    urlWithoutLocale = url
+    urlPathnameWithoutLocale = urlPathname
   }
 
-  return { locale, urlWithoutLocale }
+  return { locale, urlPathnameWithoutLocale }
 }
diff --git a/examples/i18n/renderer/+onBeforeRoute.js b/examples/i18n/renderer/+onBeforeRoute.js
index 680fc61f98b..0900170eba5 100644
--- a/examples/i18n/renderer/+onBeforeRoute.js
+++ b/examples/i18n/renderer/+onBeforeRoute.js
@@ -1,15 +1,18 @@
 export default onBeforeRoute
 
 import { extractLocale } from '../locales'
+import { modifyUrl } from 'vike/modifyUrl'
 
 function onBeforeRoute(pageContext) {
-  const { urlWithoutLocale, locale } = extractLocale(pageContext.urlPathname)
+  const url = pageContext.urlParsed
+  const { urlPathnameWithoutLocale, locale } = extractLocale(url.pathname)
+  const urlLogical = modifyUrl(url.href, { pathname: urlPathnameWithoutLocale })
   return {
     pageContext: {
       // Make `locale` available as pageContext.locale
       locale,
       // Vike's router will use pageContext.urlLogical instead of pageContext.urlOriginal
-      urlLogical: urlWithoutLocale
+      urlLogical
     }
   }
 }
diff --git a/vike/package.json b/vike/package.json
index fd488fc6680..633460eddbe 100644
--- a/vike/package.json
+++ b/vike/package.json
@@ -116,6 +116,15 @@
       "types": "./dist/esm/shared/getPageContext.d.ts",
       "default": "./dist/esm/shared/getPageContext.js"
     },
+    "./modifyUrl": {
+      "worker": "./dist/esm/shared/modifyUrl.js",
+      "edge-light": "./dist/esm/shared/modifyUrl.js",
+      "require": "./dist/cjs/shared/modifyUrl.js",
+      "node": "./dist/esm/shared/modifyUrl.js",
+      "browser": "./dist/esm/shared/modifyUrl.js",
+      "types": "./dist/esm/shared/modifyUrl.d.ts",
+      "default": "./dist/esm/shared/modifyUrl.js"
+    },
     "./__internal": {
       "require": "./dist/cjs/__internal/index.js",
       "node": "./dist/esm/__internal/index.js",
@@ -183,6 +192,9 @@
       "getPageContext": [
         "./dist/esm/shared/getPageContext.d.ts"
       ],
+      "modifyUrl": [
+        "./dist/esm/shared/modifyUrl.d.ts"
+      ],
       "__internal": [
         "./dist/esm/__internal/index.d.ts"
       ],
diff --git a/vike/shared/modifyUrl.ts b/vike/shared/modifyUrl.ts
new file mode 100644
index 00000000000..461528fd6c6
--- /dev/null
+++ b/vike/shared/modifyUrl.ts
@@ -0,0 +1,45 @@
+export { modifyUrl }
+
+import { createUrlFromComponents, parseUrl } from './utils.js'
+
+/**
+ * Modify a URL.
+ *
+ * Example: changing the URL pathname for internationalization.
+ *
+ * https://vike.dev/modifyUrl
+ */
+function modifyUrl(
+  url: string,
+  modify: {
+    pathname?: string
+    hostname?: string
+    port?: number
+    protocol?: string
+  }
+): string {
+  const urlParsed = parseUrl(url, '/')
+
+  // Pathname
+  const pathname = modify.pathname ?? urlParsed.pathname
+
+  // Origin
+  const originParts: string[] = [
+    modify.protocol ?? urlParsed.protocol ?? '',
+    modify.hostname ?? urlParsed.hostname ?? ''
+  ]
+  const port = modify.port ?? urlParsed.port
+  if (port || port === 0) {
+    originParts.push(`:${port}`)
+  }
+  const origin = originParts.join('')
+
+  const urlModified = createUrlFromComponents(
+    origin,
+    pathname,
+    // Should we also support modifying search and hash?
+    urlParsed.searchOriginal,
+    urlParsed.hashOriginal
+  )
+  return urlModified
+}