diff --git a/core/imageboard/misc.php b/core/imageboard/misc.php
index cec051d1..c82d9f98 100644
--- a/core/imageboard/misc.php
+++ b/core/imageboard/misc.php
@@ -178,6 +178,11 @@ function create_image_thumb(string $hash, string $type, string $engine = null) {
         $engine = $config->get_string(ImageConfig::THUMB_ENGINE);
     }
 
+    $output_format = $config->get_string(ImageConfig::THUMB_TYPE);
+    if($output_format=="webp") {
+        $output_format = Media::WEBP_LOSSY;
+    }
+
     send_event(new MediaResizeEvent(
         $engine,
         $inname,
@@ -186,7 +191,7 @@ function create_image_thumb(string $hash, string $type, string $engine = null) {
         $tsize[0],
         $tsize[1],
         false,
-        $config->get_string(ImageConfig::THUMB_TYPE),
+        $output_format,
         $config->get_int(ImageConfig::THUMB_QUALITY),
         true,
         $config->get_bool('thumb_upscale', false)
diff --git a/ext/handle_video/theme.php b/ext/handle_video/theme.php
index 64251769..c304eff7 100644
--- a/ext/handle_video/theme.php
+++ b/ext/handle_video/theme.php
@@ -13,6 +13,15 @@ class VideoFileHandlerTheme extends Themelet
         $loop = $config->get_bool("video_playback_loop");
         $player = make_link('vendor/bower-asset/mediaelement/build/flashmediaelement.swf');
 
+        $width="auto";
+        if($image->width>1) {
+            $width = $image->width."px";
+        }
+        $height="auto";
+        if($image->height>1) {
+            $height = $image->height."px";
+        }
+
         $html = "Video not playing? <a href='$ilink'>Click here</a> to download the file.<br/>";
 
         //Browser media format support: https://developer.mozilla.org/en-US/docs/Web/HTML/Supported_media_formats
@@ -48,7 +57,8 @@ class VideoFileHandlerTheme extends Themelet
                 $loop     = ($loop ? ' loop' : '');
 
                 $html .= "
-					<video controls class='shm-main-image' id='main_image' alt='main image' poster='$thumb_url' {$autoplay} {$loop} style='max-width: 100%'>
+					<video controls class='shm-main-image' id='main_image' alt='main image' poster='$thumb_url' {$autoplay} {$loop} 
+					style='height: $height; width: $width; max-width: 100%'>
 						<source src='{$ilink}' type='{$supportedExts[$ext]}'>
 
 						<!-- If browser doesn't support filetype, fallback to flash -->
diff --git a/ext/media/main.php b/ext/media/main.php
index 6b87c60a..a51e513e 100644
--- a/ext/media/main.php
+++ b/ext/media/main.php
@@ -726,6 +726,17 @@ class Media extends Extension
 //        }
 //    }
 
+    public static function is_lossless(string $filename, string $format) {
+        if(in_array($format, self::LOSSLESS_FORMATS)) {
+            return true;
+        }
+        switch($format) {
+            case "webp":
+                return self::is_lossless_webp($filename);
+                break;
+        }
+        return false;
+    }
 
     public static function image_resize_convert(
         String $input_path,
@@ -752,6 +763,10 @@ class Media extends Extension
             $output_type = $input_type;
         }
 
+        if($output_type=="webp" && self::is_lossless($input_path, $input_type)) {
+            $output_type = self::WEBP_LOSSLESS;
+        }
+
         $bg = "black";
         if (self::supports_alpha($output_type)) {
             $bg = "none";
@@ -759,7 +774,8 @@ class Media extends Extension
         if (!empty($input_type)) {
             $input_type = $input_type . ":";
         }
-        $args = "";
+
+        $args = " -flatten ";
         if ($minimize) {
             $args = " -strip -thumbnail";
         }
@@ -772,8 +788,19 @@ class Media extends Extension
             $resize_args .= "\!";
         }
 
-        $format = '"%s" -flatten %s %ux%u%s -quality %u -background %s %s"%s[0]"  %s:"%s" 2>&1';
-        $cmd = sprintf($format, $convert, $args, $new_width, $new_height, $resize_args, $output_quality, $bg, $input_type, $input_path, $output_type, $output_filename);
+        switch ($output_type) {
+            case Media::WEBP_LOSSLESS:
+                $args .= '-define webp:lossless=true';
+                break;
+            case "png":
+                $args .= '-define png:compression-level=9';
+                break;
+        }
+
+        $output_ext = self::determine_ext($output_type);
+
+        $format = '"%s"  %s -resize %ux%u%s -quality %u -background %s %s"%s[0]"  %s:"%s" 2>&1';
+        $cmd = sprintf($format, $convert, $args, $new_width, $new_height, $resize_args, $output_quality, $bg, $input_type, $input_path, $output_ext, $output_filename);
         $cmd = str_replace("\"convert\"", "convert", $cmd); // quotes are only needed if the path to convert contains a space; some other times, quotes break things, see github bug #27
         exec($cmd, $output, $ret);
         if ($ret != 0) {
@@ -1024,7 +1051,7 @@ class Media extends Extension
         return in_array(self::normalize_format($format), self::ALPHA_FORMATS);
     }
 
-    public static function is_input_supported($engine, $format, ?bool $lossless = null): bool
+    public static function is_input_supported(string $engine, string $format, ?bool $lossless = null): bool
     {
         $format = self::normalize_format($format, $lossless);
         if (!in_array($format, MediaEngine::INPUT_SUPPORT[$engine])) {
@@ -1033,9 +1060,9 @@ class Media extends Extension
         return true;
     }
 
-    public static function is_output_supported($engine, $format): bool
+    public static function is_output_supported(string $engine, string $format, ?bool $lossless = false): bool
     {
-        $format = self::normalize_format($format);
+        $format = self::normalize_format($format, $lossless);
         if (!in_array($format, MediaEngine::OUTPUT_SUPPORT[$engine])) {
             return false;
         }
diff --git a/ext/resize/main.php b/ext/resize/main.php
index 9290f08b..212890fe 100644
--- a/ext/resize/main.php
+++ b/ext/resize/main.php
@@ -170,12 +170,12 @@ class ResizeImage extends Extension
         }
     }
 
-    private function can_resize_format($format, ?bool $lossless): bool
+    private function can_resize_format($format, ?bool $lossless = null): bool
     {
         global $config;
         $engine = $config->get_string(ResizeConfig::ENGINE);
-        return Media::is_input_supported($engine, $format)
-                && Media::is_output_supported($engine, $format);
+        return Media::is_input_supported($engine, $format, $lossless)
+                && Media::is_output_supported($engine, $format, $lossless);
     }
 
 
@@ -183,12 +183,19 @@ class ResizeImage extends Extension
     /* ----------------------------- */
     private function resize_image(Image $image_obj, int $width, int $height)
     {
-        global $database;
+        global $database, $config;
         
         if (($height <= 0) && ($width <= 0)) {
             throw new ImageResizeException("Invalid options for height and width. ($width x $height)");
         }
-        
+
+        $engine = $config->get_string(ResizeConfig::ENGINE);
+
+
+        if(!$this->can_resize_format($image_obj->ext, $image_obj->lossless)) {
+            throw new ImageResizeException("Engine $engine cannot resize selected image");
+        }
+
         $hash = $image_obj->hash;
         $image_filename  = warehouse_path(Image::IMAGE_DIR, $hash);
 
@@ -206,7 +213,7 @@ class ResizeImage extends Extension
         }
 
         send_event(new MediaResizeEvent(
-            MediaEngine::GD,
+            $engine,
             $image_filename,
             $image_obj->ext,
             $tmp_filename,