Available from version 1.20.0
When a file is transformed and moved into storage.
Define function:
public static function onFileTransformed( $file, $thumb, $tmpThumbPath, $thumbPath ) { ... }
Attach hook: In extension.json:
	"Hooks": {
		"FileTransformed": "MyExtensionHooks::onFileTransformed"
Called from: File(s): File.php
Interface: FileTransformedHook.php

For more information about attaching hooks, see Manual:Hooks .
For examples of extensions using this hook, see Category:FileTransformed extensions.


  • $file: reference to the File object
  • $thumb: the MediaTransformOutput object
  • $tmpThumbPath: The temporary file system path of the transformed file
  • $thumbPath: The permanent storage path of the transformed file