diff --git a/api/upload-arduino.php b/api/upload-arduino.php
index 2b472c643..bf1f60846 100644
--- a/api/upload-arduino.php
+++ b/api/upload-arduino.php
@@ -3,12 +3,46 @@
 //
 //var_dump($_FILES);
 
+/**
+ * GZIPs a file on disk (appending .gz to the name)
+ *
+ * From http://stackoverflow.com/questions/6073397/how-do-you-create-a-gz-file-using-php
+ * Based on function by Kioob at:
+ * http://www.php.net/manual/en/function.gzwrite.php#34955
+ *
+ * @param string $source Path to file that should be compressed
+ * @param integer $level GZIP compression level (default: 9)
+ * @return string New filename (with .gz appended) if success, or false if operation fails
+ */
+function gzCompressFile($source, $level = 9){
+  $dest = $source . '.gz';
+  $mode = 'wb' . $level;
+  $error = false;
+  if ($fp_out = gzopen($dest, $mode)) {
+      if ($fp_in = fopen($source,'rb')) {
+          while (!feof($fp_in))
+              gzwrite($fp_out, fread($fp_in, 1024 * 512));
+          fclose($fp_in);
+      } else {
+          $error = true;
+      }
+      gzclose($fp_out);
+  } else {
+      $error = true;
+  }
+  if ($error)
+      return false;
+  else
+      return $dest;
+}
+
 $image = basename($_FILES["file"]["name"]);
 $target_file = "arduino/".$image;
 $hostname = $_SERVER['SERVER_NAME'];
 
 if (move_uploaded_file($_FILES["file"]["tmp_name"], $target_file)) {
-  echo "The file $image has been uploaded to OTA server $hostname. \n";
+  gzCompressFile($target_file);
+  echo "The files $image and $image.gz have been uploaded to OTA server $hostname. \n";
 } else {
   echo "Sorry, there was an error uploading your file $image to OTA server $hostname. \n";
 }