diff --git a/ajax/showcomic.php b/ajax/showcomic.php
index 9db4fa9..992567d 100644
--- a/ajax/showcomic.php
+++ b/ajax/showcomic.php
@@ -44,8 +44,9 @@ if ( $ext == "cbz" ) {
    $opened = $zip->open($comicfull);
    for ( $i=0; $i<$zip->numFiles; $i++ ) {
       $imgname = basename($zip->getNameIndex($i));
-      $myext = substr($imgname, -3);
-      if ( ($myext == "jpg") || ($myext == "png") ) {
+      //$myext = substr($imgname, -3);
+      $myext = strtolower(pathinfo($imgname)['extension']);
+      if ( ($myext == "jpg") || ($myext == "png") || ($myext == "webp") ) {
          $imgname = str_replace("#", "", $imgname);
          $imgcontents = $zip->getFromIndex($i);
          $written = file_put_contents($comicoutputfull . $imgname, $imgcontents);
@@ -58,8 +59,9 @@ if ( $ext == "cbz" ) {
    while ( false !== ($file = readdir($fh)) ) {
       $myfile = $comicoutputfull . $file;
       $mynewfile = $comicoutputfull . str_replace("#", "", $file);
-      $myext = strtolower(substr($file, -3));
-      if ( ($myext == "jpg") || ($myext == "png") ) {
+      //$myext = strtolower(substr($file, -3));
+      $myext = strtolower(pathinfo($imgname)['extension']);
+      if ( ($myext == "jpg") || ($myext == "png") || ($myext == "webp") ) {
          rename($myfile, $mynewfile);
          $files[] = basename($mynewfile);
       }
diff --git a/functions.php b/functions.php
index 3f08d20..b0eb92e 100644
--- a/functions.php
+++ b/functions.php
@@ -45,9 +45,11 @@ function makeThumb($item = "") {
       $imgdata = null;
       for ( $i=0; $i<$zip->numFiles; $i++ ) {
          $imgname = basename($zip->getNameIndex($i));
+         $imgext = strtolower(pathinfo($imgname)['extension']);
          if ( (strcmp($lowest, $imgname) > 0)
-              && ((strcasecmp(substr($imgname, -3), "jpg") == 0)
-                  || (strcasecmp(substr($imgname, -3), "png") == 0)) ) {
+              && ((strcasecmp($imgext, "jpg") == 0)
+                  || (strcasecmp($imgext, "png") == 0)
+                  || (strcasecmp($imgext, "webp") == 0)) ) {
             $lowest = $imgname;
             $imgdata = $zip->getFromIndex($i);
          }
@@ -63,11 +65,12 @@ function makeThumb($item = "") {
       $lowest = "~";
       foreach ( $entries as $entry ) {
          $imgname = $entry->getName();
+         $imgext = strtolower(pathinfo($imgname)['extension']);
          if ( (strcmp($lowest, $imgname) > 0)
-              && ((strcasecmp(substr($imgname, -3), "jpg") == 0)
-                  || (strcasecmp(substr($imgname, -3), "png") == 0)) ) {
+              && ((strcasecmp($imgext, "jpg") == 0)
+                  || (strcasecmp($imgext, "png") == 0)
+                  || (strcasecmp($imgext, "webp") == 0)) ) {
             $lowest = $imgname;
-            $ext = strtolower(substr($imgname, -3));
             $didwrite = $entry->extract(false, $outfile);
             if ( !$didwrite ) { return false; }
          }