diff --git a/core/modules/editor/src/Form/EditorImageDialog.php b/core/modules/editor/src/Form/EditorImageDialog.php
index 0de74e5..dad2e67 100644
--- a/core/modules/editor/src/Form/EditorImageDialog.php
+++ b/core/modules/editor/src/Form/EditorImageDialog.php
@@ -206,11 +206,9 @@ public function submitForm(array &$form, FormStateInterface $form_state) {
     // attributes and set data-entity-type to 'file'.
     $fid = $form_state->getValue(['fid', 0]);
     if (!empty($fid)) {
+      /** @var \Drupal\file\FileInterface $file */
       $file = $this->fileStorage->load($fid);
-      $file_url = file_create_url($file->getFileUri());
-      // Transform absolute image URLs to relative image URLs: prevent problems
-      // on multisite set-ups and prevent mixed content errors.
-      $file_url = file_url_transform_relative($file_url);
+      $file_url = $file->createFileUrl();
       $form_state->setValue(['attributes', 'src'], $file_url);
       $form_state->setValue(['attributes', 'data-entity-uuid'], $file->uuid());
       $form_state->setValue(['attributes', 'data-entity-type'], 'file');
diff --git a/core/modules/editor/src/Plugin/Filter/EditorFileReference.php b/core/modules/editor/src/Plugin/Filter/EditorFileReference.php
index ad2ac03..4424762 100644
--- a/core/modules/editor/src/Plugin/Filter/EditorFileReference.php
+++ b/core/modules/editor/src/Plugin/Filter/EditorFileReference.php
@@ -5,6 +5,7 @@
 use Drupal\Component\Utility\Html;
 use Drupal\Core\Entity\EntityManagerInterface;
 use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\file\FileInterface;
 use Drupal\filter\FilterProcessResult;
 use Drupal\filter\Plugin\FilterBase;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -76,8 +77,8 @@ public function process($text, $langcode) {
         // URL. This ensures the URL works even after the file location changes.
         if ($node->hasAttribute('src')) {
           $file = $this->entityManager->loadEntityByUuid('file', $uuid);
-          if ($file) {
-            $node->setAttribute('src', file_url_transform_relative(file_create_url($file->getFileUri())));
+          if ($file instanceof FileInterface) {
+            $node->setAttribute('src', $file->createFileUrl());
           }
         }
 
@@ -86,7 +87,7 @@ public function process($text, $langcode) {
           $processed_uuids[$uuid] = TRUE;
 
           $file = $this->entityManager->loadEntityByUuid('file', $uuid);
-          if ($file) {
+          if ($file instanceof FileInterface) {
             $result->addCacheTags($file->getCacheTags());
           }
         }
diff --git a/core/modules/file/file.module b/core/modules/file/file.module
index a6f6809..df9a7f5 100644
--- a/core/modules/file/file.module
+++ b/core/modules/file/file.module
@@ -1171,7 +1171,7 @@ function file_tokens($type, $tokens, array $data, array $options, BubbleableMeta
           // tokens are also often used in e-mails, it's better to keep absolute
           // file URLs. The 'url.site' cache context is associated to ensure the
           // correct absolute URL is used in case of a multisite setup.
-          $replacements[$original] = file_create_url($file->getFileUri());
+          $replacements[$original] = $file->createFileUrl(FALSE);
           $bubbleable_metadata->addCacheContexts(['url.site']);
           break;
 
@@ -1431,7 +1431,7 @@ function template_preprocess_file_link(&$variables) {
   // to ensure different file URLs are generated for different sites in a
   // multisite setup, including HTTP and HTTPS versions of the same site.
   // Fix in https://www.drupal.org/node/2646744.
-  $url = file_create_url($file_entity->getFileUri());
+  $url = $file_entity->createFileUrl(FALSE);
   $variables['#cache']['contexts'][] = 'url.site';
 
   $mime_type = $file->getMimeType();
diff --git a/core/modules/file/src/Entity/File.php b/core/modules/file/src/Entity/File.php
index 92aa436..f768ab7 100644
--- a/core/modules/file/src/Entity/File.php
+++ b/core/modules/file/src/Entity/File.php
@@ -76,11 +76,23 @@ public function setFileUri($uri) {
 
   /**
    * {@inheritdoc}
+   */
+  public function createFileUrl($relative = TRUE) {
+    $url = file_create_url($this->getFileUri());
+    if ($relative && $url) {
+      $url = file_url_transform_relative($url);
+    }
+    return $url;
+  }
+
+  /**
+   * {@inheritdoc}
    *
    * @see file_url_transform_relative()
    */
   public function url($rel = 'canonical', $options = []) {
-    return file_create_url($this->getFileUri());
+    @trigger_error('File entities returning the URL to the physical file in File::url() is deprecated, use $file->createFileUrl() instead. See https://www.drupal.org/node/3019830', E_USER_DEPRECATED);
+    return $this->createFileUrl(FALSE);
   }
 
   /**
diff --git a/core/modules/file/src/FileInterface.php b/core/modules/file/src/FileInterface.php
index ee7120b..dd4ac32 100644
--- a/core/modules/file/src/FileInterface.php
+++ b/core/modules/file/src/FileInterface.php
@@ -51,6 +51,20 @@ public function getFileUri();
   public function setFileUri($uri);
 
   /**
+   * Creates a file URL for the URI of this file.
+   *
+   * @param bool $relative
+   *   (optional) Whether the URL should be root-relative, defaults to TRUE.
+   *
+   * @return string
+   *   A string containing a URL that may be used to access the file.
+   *
+   * @see file_create_url()
+   * @see file_url_transform_relative()
+   */
+  public function createFileUrl($relative = TRUE);
+
+  /**
    * Returns the MIME type of the file.
    *
    * @return string
diff --git a/core/modules/file/src/Plugin/Field/FieldFormatter/FileMediaFormatterBase.php b/core/modules/file/src/Plugin/Field/FieldFormatter/FileMediaFormatterBase.php
index 8cbf88b..92d01af 100644
--- a/core/modules/file/src/Plugin/Field/FieldFormatter/FileMediaFormatterBase.php
+++ b/core/modules/file/src/Plugin/Field/FieldFormatter/FileMediaFormatterBase.php
@@ -196,7 +196,7 @@ protected function getSourceFiles(EntityReferenceFieldItemListInterface $items,
       if (static::mimeTypeApplies($file->getMimeType())) {
         $source_attributes = new Attribute();
         $source_attributes
-          ->setAttribute('src', file_url_transform_relative(file_create_url($file->getFileUri())))
+          ->setAttribute('src', $file->createFileUrl())
           ->setAttribute('type', $file->getMimeType());
         if ($this->getSetting('multiple_file_display_type') === 'tags') {
           $source_files[] = [
diff --git a/core/modules/file/src/Plugin/Field/FieldFormatter/RSSEnclosureFormatter.php b/core/modules/file/src/Plugin/Field/FieldFormatter/RSSEnclosureFormatter.php
index a433d99..12d0551 100644
--- a/core/modules/file/src/Plugin/Field/FieldFormatter/RSSEnclosureFormatter.php
+++ b/core/modules/file/src/Plugin/Field/FieldFormatter/RSSEnclosureFormatter.php
@@ -25,13 +25,14 @@ public function viewElements(FieldItemListInterface $items, $langcode) {
     // Add the first file as an enclosure to the RSS item. RSS allows only one
     // enclosure per item. See: http://wikipedia.org/wiki/RSS_enclosure
     foreach ($this->getEntitiesToView($items, $langcode) as $delta => $file) {
+      /** @var \Drupal\file\FileInterface $file */
       $entity->rss_elements[] = [
         'key' => 'enclosure',
         'attributes' => [
           // In RSS feeds, it is necessary to use absolute URLs. The 'url.site'
           // cache context is already associated with RSS feed responses, so it
           // does not need to be specified here.
-          'url' => file_create_url($file->getFileUri()),
+          'url' => $file->createFileUrl(FALSE),
           'length' => $file->getSize(),
           'type' => $file->getMimeType(),
         ],
diff --git a/core/modules/file/src/Plugin/Field/FieldFormatter/UrlPlainFormatter.php b/core/modules/file/src/Plugin/Field/FieldFormatter/UrlPlainFormatter.php
index d5e2a7c..73a8aed 100644
--- a/core/modules/file/src/Plugin/Field/FieldFormatter/UrlPlainFormatter.php
+++ b/core/modules/file/src/Plugin/Field/FieldFormatter/UrlPlainFormatter.php
@@ -3,6 +3,7 @@
 namespace Drupal\file\Plugin\Field\FieldFormatter;
 
 use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\file\FileInterface;
 
 /**
  * Plugin implementation of the 'file_url_plain' formatter.
@@ -24,8 +25,9 @@ public function viewElements(FieldItemListInterface $items, $langcode) {
     $elements = [];
 
     foreach ($this->getEntitiesToView($items, $langcode) as $delta => $file) {
+      assert($file instanceof FileInterface);
       $elements[$delta] = [
-        '#markup' => file_url_transform_relative(file_create_url($file->getFileUri())),
+        '#markup' => $file->createFileUrl(),
         '#cache' => [
           'tags' => $file->getCacheTags(),
         ],
diff --git a/core/modules/file/src/Tests/FileFieldWidgetTest.php b/core/modules/file/src/Tests/FileFieldWidgetTest.php
index 3102bd7..bef39f1 100644
--- a/core/modules/file/src/Tests/FileFieldWidgetTest.php
+++ b/core/modules/file/src/Tests/FileFieldWidgetTest.php
@@ -92,7 +92,7 @@ public function testSingleValuedWidget() {
       $this->assertFileExists($node_file, 'New file saved to disk on node creation.');
 
       // Ensure the file can be downloaded.
-      $this->drupalGet(file_create_url($node_file->getFileUri()));
+      $this->drupalGet($node_file->createFileUrl());
       $this->assertResponse(200, 'Confirmed that the generated URL is correct by downloading the shipped file.');
 
       // Ensure the edit page has a remove button instead of an upload button.
@@ -322,7 +322,7 @@ public function testPrivateFileSetting() {
     $this->assertFileExists($node_file, 'New file saved to disk on node creation.');
 
     // Ensure the private file is available to the user who uploaded it.
-    $this->drupalGet(file_create_url($node_file->getFileUri()));
+    $this->drupalGet($node_file->createFileUrl());
     $this->assertResponse(200, 'Confirmed that the generated URL is correct by downloading the shipped file.');
 
     // Ensure we can't change 'uri_scheme' field settings while there are some
@@ -388,14 +388,14 @@ public function testPrivateFileComment() {
     $comment_file = $comment->{'field_' . $name}->entity;
     $this->assertFileExists($comment_file, 'New file saved to disk on node creation.');
     // Test authenticated file download.
-    $url = file_create_url($comment_file->getFileUri());
+    $url = $comment_file->createFileUrl();
     $this->assertNotEqual($url, NULL, 'Confirmed that the URL is valid');
-    $this->drupalGet(file_create_url($comment_file->getFileUri()));
+    $this->drupalGet($url);
     $this->assertResponse(200, 'Confirmed that the generated URL is correct by downloading the shipped file.');
 
     // Test anonymous file download.
     $this->drupalLogout();
-    $this->drupalGet(file_create_url($comment_file->getFileUri()));
+    $this->drupalGet($url);
     $this->assertResponse(403, 'Confirmed that access is denied for the file without the needed permission.');
 
     // Unpublishes node.
@@ -405,7 +405,7 @@ public function testPrivateFileComment() {
 
     // Ensures normal user can no longer download the file.
     $this->drupalLogin($user);
-    $this->drupalGet(file_create_url($comment_file->getFileUri()));
+    $this->drupalGet($url);
     $this->assertResponse(403, 'Confirmed that access is denied for the file without the needed permission.');
   }
 
@@ -575,7 +575,7 @@ protected function doTestTemporaryFileRemovalExploit(UserInterface $victim_user,
       $this->assertEqual($attacker_user->id(), $node_file->getOwnerId(), 'New file belongs to the attacker.');
 
       // Ensure the file can be downloaded.
-      $this->drupalGet(file_create_url($node_file->getFileUri()));
+      $this->drupalGet($node_file->createFileUrl());
       $this->assertResponse(200, 'Confirmed that the generated URL is correct by downloading the shipped file.');
 
       // "Click" the remove button (emulating either a nojs or js submission).
diff --git a/core/modules/file/tests/src/Functional/FileFieldDisplayTest.php b/core/modules/file/tests/src/Functional/FileFieldDisplayTest.php
index a5c4ebf..68fe7d2 100644
--- a/core/modules/file/tests/src/Functional/FileFieldDisplayTest.php
+++ b/core/modules/file/tests/src/Functional/FileFieldDisplayTest.php
@@ -211,7 +211,7 @@ public function testDescriptionDefaultFileFieldDisplay() {
 
     // Test default formatter.
     $this->drupalGet('node/' . $nid);
-    $this->assertFieldByXPath('//a[@href="' . $node->{$field_name}->entity->url() . '"]', $description);
+    $this->assertFieldByXPath('//a[@href="' . $node->{$field_name}->entity->createFileUrl(FALSE) . '"]', $description);
 
     // Change formatter to "Table of files".
     $display = \Drupal::entityTypeManager()->getStorage('entity_view_display')->load('node.' . $type_name . '.default');
@@ -221,7 +221,7 @@ public function testDescriptionDefaultFileFieldDisplay() {
     ])->save();
 
     $this->drupalGet('node/' . $nid);
-    $this->assertFieldByXPath('//a[@href="' . $node->{$field_name}->entity->url() . '"]', $description);
+    $this->assertFieldByXPath('//a[@href="' . $node->{$field_name}->entity->createFileUrl(FALSE) . '"]', $description);
   }
 
   /**
diff --git a/core/modules/file/tests/src/Functional/Formatter/FileAudioFormatterTest.php b/core/modules/file/tests/src/Functional/Formatter/FileAudioFormatterTest.php
index ae75c70..2de18a2 100644
--- a/core/modules/file/tests/src/Functional/Formatter/FileAudioFormatterTest.php
+++ b/core/modules/file/tests/src/Functional/Formatter/FileAudioFormatterTest.php
@@ -46,8 +46,8 @@ public function testRender($tag_count, $formatter_settings) {
 
     $this->drupalGet($entity->toUrl());
 
-    $file1_url = file_url_transform_relative(file_create_url($file1->getFileUri()));
-    $file2_url = file_url_transform_relative(file_create_url($file2->getFileUri()));
+    $file1_url = $file1->createFileUrl();
+    $file2_url = $file2->createFileUrl();
 
     $assert_session = $this->assertSession();
     $assert_session->elementsCount('css', 'audio[controls="controls"]', $tag_count);
diff --git a/core/modules/file/tests/src/Functional/Formatter/FileVideoFormatterTest.php b/core/modules/file/tests/src/Functional/Formatter/FileVideoFormatterTest.php
index 0cc997c..fd9e569 100644
--- a/core/modules/file/tests/src/Functional/Formatter/FileVideoFormatterTest.php
+++ b/core/modules/file/tests/src/Functional/Formatter/FileVideoFormatterTest.php
@@ -46,8 +46,8 @@ public function testRender($tag_count, $formatter_settings) {
 
     $this->drupalGet($entity->toUrl());
 
-    $file1_url = file_url_transform_relative(file_create_url($file1->getFileUri()));
-    $file2_url = file_url_transform_relative(file_create_url($file2->getFileUri()));
+    $file1_url = $file1->createFileUrl();
+    $file2_url = $file2->createFileUrl();
 
     $assert_session = $this->assertSession();
     $assert_session->elementsCount('css', 'video[controls="controls"]', $tag_count);
diff --git a/core/modules/file/tests/src/Kernel/FileItemTest.php b/core/modules/file/tests/src/Kernel/FileItemTest.php
index ac6cd88..bc6eb54 100644
--- a/core/modules/file/tests/src/Kernel/FileItemTest.php
+++ b/core/modules/file/tests/src/Kernel/FileItemTest.php
@@ -99,7 +99,6 @@ public function testFileItem() {
     $this->assertEqual($entity->file_test->display, 1);
     $this->assertEqual($entity->file_test->description, $description);
     $this->assertEqual($entity->file_test->entity->getFileUri(), $this->file->getFileUri());
-    $this->assertEqual($entity->file_test->entity->url(), $url = file_create_url($this->file->getFileUri()));
     $this->assertEqual($entity->file_test->entity->id(), $this->file->id());
     $this->assertEqual($entity->file_test->entity->uuid(), $this->file->uuid());
 
diff --git a/core/modules/file/tests/src/Kernel/FileLegacyTest.php b/core/modules/file/tests/src/Kernel/FileLegacyTest.php
new file mode 100644
index 0000000..47a3c70
--- /dev/null
+++ b/core/modules/file/tests/src/Kernel/FileLegacyTest.php
@@ -0,0 +1,49 @@
+<?php
+
+namespace Drupal\Tests\file\Kernel;
+
+use Drupal\Tests\field\Kernel\FieldKernelTestBase;
+use Drupal\file\Entity\File;
+
+/**
+ * Tests file deprecations.
+ *
+ * @group file
+ * @group legacy
+ */
+class FileLegacyTest extends FieldKernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['file'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->installEntitySchema('user');
+    $this->installConfig(['user']);
+
+    $this->installEntitySchema('file');
+    $this->installSchema('file', ['file_usage']);
+  }
+
+  /**
+   * Tests that File::url() is deprecated.
+   *
+   * @expectedDeprecation File entities returning the URL to the physical file in File::url() is deprecated, use $file->createFileUrl() instead. See https://www.drupal.org/node/3019830
+   */
+  public function testFileUrlDeprecation() {
+    file_put_contents('public://example.txt', $this->randomMachineName());
+    $file = File::create([
+      'uri' => 'public://example.txt',
+    ]);
+    $file->save();
+
+    $this->assertEquals($file->createFileUrl(FALSE), $file->url());
+  }
+
+}
diff --git a/core/modules/hal/src/Normalizer/FileEntityNormalizer.php b/core/modules/hal/src/Normalizer/FileEntityNormalizer.php
index ec73f95..8dd5737 100644
--- a/core/modules/hal/src/Normalizer/FileEntityNormalizer.php
+++ b/core/modules/hal/src/Normalizer/FileEntityNormalizer.php
@@ -83,7 +83,7 @@ protected function getEntityUri(EntityInterface $entity, array $context = []) {
     // back to the old behavior because it relies on said hack, not just to
     // generate the value for the 'uri' field of a file (see ::normalize()), but
     // also for the HAL normalization's '_links' value.
-    return file_create_url($entity->getFileUri());
+    return $entity->createFileUrl(FALSE);
   }
 
 }
diff --git a/core/modules/hal/tests/src/Kernel/FileNormalizeTest.php b/core/modules/hal/tests/src/Kernel/FileNormalizeTest.php
index edcf3dc..bda9a8b 100644
--- a/core/modules/hal/tests/src/Kernel/FileNormalizeTest.php
+++ b/core/modules/hal/tests/src/Kernel/FileNormalizeTest.php
@@ -45,7 +45,7 @@ public function testNormalize() {
       'uri' => [
         [
           'value' => $file->getFileUri(),
-          'url' => file_url_transform_relative(file_create_url($file->getFileUri())),
+          'url' => $file->createFileUrl(),
         ],
       ],
     ];
diff --git a/core/modules/image/tests/src/Functional/ImageFieldDisplayTest.php b/core/modules/image/tests/src/Functional/ImageFieldDisplayTest.php
index 33e042e..b0f38e8 100644
--- a/core/modules/image/tests/src/Functional/ImageFieldDisplayTest.php
+++ b/core/modules/image/tests/src/Functional/ImageFieldDisplayTest.php
@@ -277,7 +277,7 @@ public function testImageFieldSettings() {
     $node = $node_storage->load($nid);
     $file = $node->{$field_name}->entity;
 
-    $url = file_url_transform_relative(file_create_url(ImageStyle::load('medium')->buildUrl($file->getFileUri())));
+    $url = file_url_transform_relative(ImageStyle::load('medium')->buildUrl($file->getFileUri()));
     $this->assertTrue($this->cssSelect('img[width=40][height=20][class=image-style-medium][src="' . $url . '"]'));
 
     // Add alt/title fields to the image and verify that they are displayed.
diff --git a/core/modules/media/tests/src/Functional/Hal/MediaHalJsonAnonTest.php b/core/modules/media/tests/src/Functional/Hal/MediaHalJsonAnonTest.php
index 5b8de2d..2b92c73 100644
--- a/core/modules/media/tests/src/Functional/Hal/MediaHalJsonAnonTest.php
+++ b/core/modules/media/tests/src/Functional/Hal/MediaHalJsonAnonTest.php
@@ -53,7 +53,7 @@ protected function getExpectedNormalizedEntity() {
         ],
         $this->baseUrl . '/rest/relation/media/camelids/field_media_file' => [
           [
-            'href' => $file->url(),
+            'href' => $file->createFileUrl(FALSE),
             'lang' => 'en',
           ],
         ],
@@ -64,7 +64,7 @@ protected function getExpectedNormalizedEntity() {
         ],
         $this->baseUrl . '/rest/relation/media/camelids/thumbnail' => [
           [
-            'href' => $thumbnail->url(),
+            'href' => $thumbnail->createFileUrl(FALSE),
             'lang' => 'en',
           ],
         ],
@@ -80,7 +80,7 @@ protected function getExpectedNormalizedEntity() {
           [
             '_links' => [
               'self' => [
-                'href' => $file->url(),
+                'href' => $file->createFileUrl(FALSE),
               ],
               'type' => [
                 'href' => $this->baseUrl . '/rest/type/file/file',
@@ -115,7 +115,7 @@ protected function getExpectedNormalizedEntity() {
           [
             '_links' => [
               'self' => [
-                'href' => $thumbnail->url(),
+                'href' => $thumbnail->createFileUrl(FALSE),
               ],
               'type' => [
                 'href' => $this->baseUrl . '/rest/type/file/file',
diff --git a/core/modules/media/tests/src/Functional/Rest/MediaResourceTestBase.php b/core/modules/media/tests/src/Functional/Rest/MediaResourceTestBase.php
index 78678e2..9b374d5 100644
--- a/core/modules/media/tests/src/Functional/Rest/MediaResourceTestBase.php
+++ b/core/modules/media/tests/src/Functional/Rest/MediaResourceTestBase.php
@@ -176,7 +176,7 @@ protected function getExpectedNormalizedEntity() {
           'target_id' => (int) $file->id(),
           'target_type' => 'file',
           'target_uuid' => $file->uuid(),
-          'url' => $file->url(),
+          'url' => $file->createFileUrl(FALSE),
         ],
       ],
       'thumbnail' => [
@@ -188,7 +188,7 @@ protected function getExpectedNormalizedEntity() {
           'target_type' => 'file',
           'target_uuid' => $thumbnail->uuid(),
           'title' => NULL,
-          'url' => $thumbnail->url(),
+          'url' => $thumbnail->createFileUrl(FALSE),
         ],
       ],
       'status' => [
diff --git a/core/modules/responsive_image/src/Plugin/Field/FieldFormatter/ResponsiveImageFormatter.php b/core/modules/responsive_image/src/Plugin/Field/FieldFormatter/ResponsiveImageFormatter.php
index f17fb2e..0c1da94 100644
--- a/core/modules/responsive_image/src/Plugin/Field/FieldFormatter/ResponsiveImageFormatter.php
+++ b/core/modules/responsive_image/src/Plugin/Field/FieldFormatter/ResponsiveImageFormatter.php
@@ -9,6 +9,7 @@
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
 use Drupal\Core\Url;
+use Drupal\file\FileInterface;
 use Drupal\image\Plugin\Field\FieldFormatter\ImageFormatterBase;
 use Drupal\responsive_image\Entity\ResponsiveImageStyle;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -227,9 +228,10 @@ public function viewElements(FieldItemListInterface $items, $langcode) {
     }
 
     foreach ($files as $delta => $file) {
+      assert($file instanceof FileInterface);
       // Link the <picture> element to the original file.
       if (isset($link_file)) {
-        $url = file_url_transform_relative(file_create_url($file->getFileUri()));
+        $url = $file->createFileUrl();
       }
       // Extract field item attributes for the theme function, and unset them
       // from the $item so that the field template does not re-render them.