diff --git a/inc/config.php b/inc/config.php
index da0fa3c1..0e255118 100644
--- a/inc/config.php
+++ b/inc/config.php
@@ -818,6 +818,7 @@
 	$config['allowed_ext'][] = 'bmp';
 	$config['allowed_ext'][] = 'gif';
 	$config['allowed_ext'][] = 'png';
+	$config['allowed_ext'][] = 'webp';
 	// $config['allowed_ext'][] = 'svg';
 
 	// Allowed extensions for OP. Inherits from the above setting if set to false. Otherwise, it overrides both allowed_ext and
diff --git a/inc/image.php b/inc/image.php
index d7756ffd..5f7fc8a5 100644
--- a/inc/image.php
+++ b/inc/image.php
@@ -496,3 +496,12 @@ class ImageBMP extends ImageBase {
 		imagebmp($this->image, $src);
 	}
 }
+
+class ImageWEBP extends ImageBase {
+	public function from() {
+		$this->image = @imagecreatefromwebp($this->src);
+	}
+	public function to($src) {
+		imagewebp($this->image, $src);
+	}
+}
diff --git a/post.php b/post.php
index bd1591d9..248b372c 100644
--- a/post.php
+++ b/post.php
@@ -983,7 +983,7 @@ if (isset($_POST['delete'])) {
 			if (!$size = @getimagesize($file['tmp_name'])) {
 				error($config['error']['invalidimg']);
 			}
-			if (!in_array($size[2], array(IMAGETYPE_PNG, IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_BMP))) {
+			if (!in_array($size[2], array(IMAGETYPE_PNG, IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_BMP, IMAGETYPE_WEBP))) {
 				error($config['error']['invalidimg']);
 			}
 			if ($size[0] > $config['max_width'] || $size[1] > $config['max_height']) {