diff --git a/COMPONENT_INDEX.md b/COMPONENT_INDEX.md
index e4bc1dc7..12257e16 100644
--- a/COMPONENT_INDEX.md
+++ b/COMPONENT_INDEX.md
@@ -1335,7 +1335,7 @@ None.
 | files         | <code>let</code> | Yes      | <code>File[]</code>                       | <code>[]</code>                                  | Obtain a reference to the uploaded files                                                                     |
 | accept        | <code>let</code> | No       | <code>string[]</code>                     | <code>[]</code>                                  | Specify the accepted file types                                                                              |
 | multiple      | <code>let</code> | No       | <code>boolean</code>                      | <code>false</code>                               | Set to `true` to allow multiple files                                                                        |
-| validateFiles | <code>let</code> | No       | <code>(files: File) => File</code>        | <code>(files) => files</code>                    | Override the default behavior of validating uploaded files<br />The default behavior does not validate files |
+| validateFiles | <code>let</code> | No       | <code>(files: File[]) => File[]</code>    | <code>(files) => files</code>                    | Override the default behavior of validating uploaded files<br />The default behavior does not validate files |
 | labelText     | <code>let</code> | No       | <code>string</code>                       | <code>"Add file"</code>                          | Specify the label text                                                                                       |
 | role          | <code>let</code> | No       | <code>string</code>                       | <code>"button"</code>                            | Specify the `role` attribute of the drop container                                                           |
 | disabled      | <code>let</code> | No       | <code>boolean</code>                      | <code>false</code>                               | Set to `true` to disable the input                                                                           |
diff --git a/docs/src/COMPONENT_API.json b/docs/src/COMPONENT_API.json
index 6fac60af..ec4b8462 100644
--- a/docs/src/COMPONENT_API.json
+++ b/docs/src/COMPONENT_API.json
@@ -3786,7 +3786,7 @@
           "name": "validateFiles",
           "kind": "let",
           "description": "Override the default behavior of validating uploaded files\nThe default behavior does not validate files",
-          "type": "(files: File) => File",
+          "type": "(files: File[]) => File[]",
           "value": "(files) => files",
           "isFunction": true,
           "isFunctionDeclaration": false,
diff --git a/src/FileUploader/FileUploaderDropContainer.svelte b/src/FileUploader/FileUploaderDropContainer.svelte
index 48e6176f..0b82c811 100644
--- a/src/FileUploader/FileUploaderDropContainer.svelte
+++ b/src/FileUploader/FileUploaderDropContainer.svelte
@@ -22,7 +22,7 @@
   /**
    * Override the default behavior of validating uploaded files
    * The default behavior does not validate files
-   * @type {(files: File) => File}
+   * @type {(files: File[]) => File[]}
    */
   export let validateFiles = (files) => files;
 
diff --git a/types/FileUploader/FileUploaderDropContainer.svelte.d.ts b/types/FileUploader/FileUploaderDropContainer.svelte.d.ts
index 45a92ae0..a8345102 100644
--- a/types/FileUploader/FileUploaderDropContainer.svelte.d.ts
+++ b/types/FileUploader/FileUploaderDropContainer.svelte.d.ts
@@ -26,7 +26,7 @@ export interface FileUploaderDropContainerProps
    * The default behavior does not validate files
    * @default (files) => files
    */
-  validateFiles?: (files: File) => File;
+  validateFiles?: (files: File[]) => File[];
 
   /**
    * Specify the label text