diff --git a/core/lib/Drupal/Core/Path/AliasStorage.php b/core/lib/Drupal/Core/Path/AliasStorage.php
index b9f65fe..0ef4a12 100644
--- a/core/lib/Drupal/Core/Path/AliasStorage.php
+++ b/core/lib/Drupal/Core/Path/AliasStorage.php
@@ -99,10 +99,8 @@ public function save($source, $alias, $langcode = LanguageInterface::LANGCODE_NO
   public function load($conditions) {
     $select = $this->connection->select('url_alias');
     foreach ($conditions as $field => $value) {
-      if ($field == 'alias') {
-        $value = Unicode::strtolower($value);
-      }
-      $select->condition($field, $value);
+      // Use LIKE for case-insensitive matching.
+      $select->condition($field, $value, 'LIKE');
     }
     return $select
       ->fields('url_alias')
@@ -119,10 +117,8 @@ public function delete($conditions) {
     $path = $this->load($conditions);
     $query = $this->connection->delete('url_alias');
     foreach ($conditions as $field => $value) {
-      if ($field == 'alias') {
-        $value = Unicode::strtolower($value);
-      }
-      $query->condition($field, $value);
+      // Use LIKE for case-insensitive matching.
+      $query->condition($field, $value, 'LIKE');
     }
     $deleted = $query->execute();
     // @todo Switch to using an event for this instead of a hook.
@@ -215,7 +211,8 @@ public function lookupPathSource($path, $langcode) {
    */
   public function aliasExists($alias, $langcode, $source = NULL) {
     $query = $this->connection->select('url_alias')
-      ->condition('alias', Unicode::strtolower($alias))
+      // Use LIKE for case-insensitive matching.
+      ->condition('alias', $alias, 'LIKE')
       ->condition('langcode', $langcode);
     if (!empty($source)) {
       $query->condition('source', $source, '<>');
@@ -241,7 +238,7 @@ public function getAliasesForAdminListing($header, $keys = NULL) {
       ->extend('Drupal\Core\Database\Query\TableSortExtender');
     if ($keys) {
       // Replace wildcards with PDO wildcards.
-      $query->condition('alias', '%' . preg_replace('!\*+!', '%', Unicode::strtolower($keys)) . '%', 'LIKE');
+      $query->condition('alias', '%' . preg_replace('!\*+!', '%', $keys) . '%', 'LIKE');
     }
     return $query
       ->fields('url_alias')
diff --git a/core/lib/Drupal/Core/Path/AliasStorageInterface.php b/core/lib/Drupal/Core/Path/AliasStorageInterface.php
index 63cb942..3f55413 100644
--- a/core/lib/Drupal/Core/Path/AliasStorageInterface.php
+++ b/core/lib/Drupal/Core/Path/AliasStorageInterface.php
@@ -97,8 +97,7 @@ public function lookupPathAlias($path, $langcode);
    * Returns Drupal system URL of an alias.
    *
    * @param string $path
-   *   The path to investigate for corresponding system URLs. This will be
-   *   converted to lowercase.
+   *   The path to investigate for corresponding system URLs.
    * @param string $langcode
    *   Language code to search the path with. If there's no path defined for
    *   that language it will search paths without language.
@@ -112,7 +111,7 @@ public function lookupPathSource($path, $langcode);
    * Checks if alias already exists.
    *
    * @param string $alias
-   *   Alias to check against. This will be converted to lowercase.
+   *   Alias to check against.
    * @param string $langcode
    *   Language of the alias.
    * @param string|null $source
@@ -138,7 +137,7 @@ public function languageAliasExists();
    *   Table header.
    * @param string|null $keys
    *   (optional) Search keyword that may include one or more '*' as a wildcard
-   *   value. This will be converted to lowercase.
+   *   value.
    *
    * @return array
    *   Array of items to be displayed on the current page.