diff --git a/docs/source/uploader.rst b/docs/source/uploader.rst
index 50b5f9d..6bff50a 100644
--- a/docs/source/uploader.rst
+++ b/docs/source/uploader.rst
@@ -123,6 +123,48 @@ You can override the most validation configuration values set in ``config/mediab
 
         ->upload();
 
+You can also validate the file without uploading it by calling the ``verifyFile`` method.
+If the file does not pass validation, an instance of ``Plank\Mediable\MediaUploadException`` will be thrown
+
+::
+
+    <?php
+    $media = MediaUploader::fromSource($request->file('image'))
+
+        // model class to use
+        ->setModelClass(MediaSubclass::class)
+
+        // maximum filesize in bytes
+        ->setMaximumSize(99999)
+
+        // only allow files of specific MIME types
+        ->setAllowedMimeTypes(['image/jpeg'])
+
+        ->verifyFile()
+
+
+Alter Model before upload
+-------------------------
+
+You can manipulate the model before it's saved by passing a callable to the ``beforeSave`` method.
+The callback takes two params, ``$model`` an instance of ``Plank\Mediable\Media`` the current model and ``$source`` an instance of ``Plank\Mediable\SourceAdapters\SourceAdapterInterface`` the current source.
+
+::
+
+    <?php
+    $media = MediaUploader::fromSource($request->file('image'))
+
+        // model class to use
+        ->setModelClass(CustomMediaClass::class)
+
+        // pass the callable
+        ->beforeSave(function (Media $model, SourceAdapterInterface $source) {
+            $model->setAttribute('customAttribute', 'value')
+        })
+
+        ->upload()
+
+
 Handling Exceptions
 --------------------
 
diff --git a/src/MediaUploader.php b/src/MediaUploader.php
index 762f557..707ba0d 100644
--- a/src/MediaUploader.php
+++ b/src/MediaUploader.php
@@ -72,6 +72,12 @@ class MediaUploader
      */
     private $hash_filename = false;
 
+    /**
+     * Callable allowing to alter the model before save.
+     * @var callable
+     */
+    private $before_save;
+
     /**
      * Constructor.
      * @param \Illuminate\Filesystem\FilesystemManager            $filesystem
@@ -423,13 +429,14 @@ public function possibleAggregateTypesForExtension($extension)
      */
     public function upload()
     {
-        $this->verifySource();
+        $this->verifyFile();
 
         $model = $this->makeModel();
 
-        $model->size = $this->verifyFileSize($this->source->size());
-        $model->mime_type = $this->verifyMimeType($this->source->mimeType());
-        $model->extension = $this->verifyExtension($this->source->extension());
+        $model->size = $this->source->size();
+        $model->mime_type = $this->source->mimeType();
+        $model->extension = $this->source->extension();
+
         $model->aggregate_type = $this->inferAggregateType($model->mime_type, $model->extension);
 
         $model->disk = $this->disk ?: $this->config['default_disk'];
@@ -438,12 +445,27 @@ public function upload()
 
         $this->verifyDestination($model);
 
+        if (is_callable($this->before_save)) {
+            call_user_func($this->before_save, $model, $this->source);
+        }
+
         $this->filesystem->disk($model->disk)->put($model->getDiskPath(), $this->source->contents());
         $model->save();
 
         return $model;
     }
 
+    /**
+     * Set the before save callback
+     * @param callable $callable
+     * @return static
+     */
+    public function beforeSave(callable $callable)
+    {
+        $this->before_save = $callable;
+        return $this;
+    }
+
     /**
      * Create a `Media` record for a file already on a disk.
      * @param  string $disk
@@ -512,6 +534,23 @@ public function update(Media $media)
         return $dirty;
     }
 
+    /**
+     * Verify if file is valid
+     * @throws \Plank\Mediable\Exceptions\MediaUpload\ConfigurationException If no source is provided
+     * @throws \Plank\Mediable\Exceptions\MediaUpload\FileNotFoundException If the source is invalid
+     * @throws \Plank\Mediable\Exceptions\MediaUpload\FileSizeException If the file is too large
+     * @throws \Plank\Mediable\Exceptions\MediaUpload\FileNotSupportedException If the mime type is not allowed
+     * @throws \Plank\Mediable\Exceptions\MediaUpload\FileNotSupportedException If the file extension is not allowed
+     * @return void
+     */
+    public function verifyFile()
+    {
+        $this->verifySource();
+        $this->verifyFileSize($this->source->size());
+        $this->verifyMimeType($this->source->mimeType());
+        $this->verifyExtension($this->source->extension());
+    }
+
     /**
      * Generate an instance of the `Media` class.
      * @return \Plank\Mediable\Media
diff --git a/tests/integration/MediaUploaderTest.php b/tests/integration/MediaUploaderTest.php
index 29f759e..6c4529e 100644
--- a/tests/integration/MediaUploaderTest.php
+++ b/tests/integration/MediaUploaderTest.php
@@ -422,6 +422,29 @@ public function test_it_use_hash_for_filename()
         $this->assertEquals('3ef5e70366086147c2695325d79a25cc', $media->filename);
     }
 
+    public function test_it_uploads_files_with_altered_model()
+    {
+        $this->useDatabase();
+        $this->useFilesystem('tmp');
+
+        $media = Facade::fromSource(__DIR__ . '/../_data/plank.png')
+            ->toDestination('tmp', 'foo')
+            ->useFilename('bar')
+            ->beforeSave(function ($model) {
+                $model->id = 9876;
+            })
+            ->upload();
+
+        $this->assertInstanceOf(Media::class, $media);
+        $this->assertTrue($media->fileExists());
+        $this->assertEquals('tmp', $media->disk);
+        $this->assertEquals('foo/bar.png', $media->getDiskPath());
+        $this->assertEquals('image/png', $media->mime_type);
+        $this->assertEquals(7173, $media->size);
+        $this->assertEquals('image', $media->aggregate_type);
+        $this->assertEquals(9876, $media->id);
+    }
+
     protected function mockUploader($filesystem = null, $factory = null)
     {
         return new MediaUploader(