diff --git a/auth.php b/auth.php
index 9f302d4..f69c6c3 100755
--- a/auth.php
+++ b/auth.php
@@ -17,7 +17,12 @@
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
-define("ROOT_DIR", __DIR__);
+if (defined('headless')) {
+  ob_get_contents();
+  ob_end_clean();
+  error_reporting(0);
+}
+define('ROOT_DIR', __DIR__);
 require_once(ROOT_DIR . "/helpers/config.php");
 require_once(ROOT_DIR . "/lang.php");
 require_once(ROOT_DIR . "/helpers/user.php");
diff --git a/helpers/utils.php b/helpers/utils.php
new file mode 100644
index 0000000..8f0246c
--- /dev/null
+++ b/helpers/utils.php
@@ -0,0 +1,67 @@
+<?php
+/* μlogger
+ *
+ * Copyright(C) 2017 Bartek Fabiszewski (www.fabiszewski.net)
+ *
+ * This is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+ /**
+  * Various util functions
+  */
+  class uUtils {
+
+    /**
+     * Calculate maximum allowed size of uploaded file
+     * for current PHP settings
+     *
+     * @return int Number of bytes
+     */
+    public static function getUploadMaxSize() {
+      $upload_max_filesize = self::iniGetBytes('upload_max_filesize');
+      $post_max_size = self::iniGetBytes('post_max_size');
+      // post_max_size = 0 means unlimited size
+      if ($post_max_size == 0) { $post_max_size = $upload_max_filesize; }
+      $memory_limit = self::iniGetBytes('memory_limit');
+      // memory_limit = -1 means no limit
+      if ($memory_limit < 0) { $memory_limit = $post_max_size; }
+      return min($upload_max_filesize, $post_max_size, $memory_limit);
+    }
+
+    /**
+     * Get number of bytes from ini parameter.
+     * Optionally parses shorthand byte values (G, M, B)
+     *
+     * @param string $iniParam Ini parameter name
+     * @return int Bytes
+     */
+    private static function iniGetBytes($iniParam) {
+      $iniStr = ini_get($iniParam);
+      $val = floatval($iniStr);
+      $suffix = substr(trim($iniStr), -1);
+      if (ctype_alpha($suffix)) {
+        switch (strtolower($suffix)) {
+          case 'g':
+            $val *= 1024;
+          case 'm':
+            $val *= 1024;
+          case 'k':
+            $val *= 1024;
+        }
+      }
+      return (int) $val;
+    }
+  }
+
+?>
\ No newline at end of file
diff --git a/index.php b/index.php
index b25c9b4..8aa15e9 100755
--- a/index.php
+++ b/index.php
@@ -20,6 +20,7 @@
   require_once(__DIR__ . "/auth.php"); // sets $user
   require_once(ROOT_DIR . "/helpers/position.php");
   require_once(ROOT_DIR . "/helpers/track.php");
+  require_once(ROOT_DIR . "/helpers/utils.php");
 
   $displayUserId = NULL;
   $usersArr = [];
@@ -197,8 +198,8 @@
         <?php if ($user->isValid): ?>
           <div id="import">
             <u><?= $lang["import"] ?></u><br>
-            <form id="importForm" enctype="multipart/form-data" method="POST">
-              <input type="hidden" name="MAX_FILE_SIZE" value="1048576" />
+            <form id="importForm" enctype="multipart/form-data" method="post">
+              <input type="hidden" name="MAX_FILE_SIZE" value="<?= uUtils::getUploadMaxSize() ?>" />
               <input type="file" id="inputFile" name="gpx" style="display:none" onchange="importFile(this)" />
             </form>
             <a class="menulink" href="javascript:void(0);" onclick="document.getElementById('inputFile').click();">gpx</a>
diff --git a/js/main.js b/js/main.js
index d703281..54dba6a 100755
--- a/js/main.js
+++ b/js/main.js
@@ -243,12 +243,7 @@ function importFile(input){
       xhr = null;
     }
   }
-  xhr.upload.onprogress = function(e) {
-    console.log(e.loaded, e.total)
-  }
-  xhr.upload.onload = function(e) {
-    console.log('file upload')
-  }
+  // FIXME: show progress
   xhr.open("POST", "utils/import.php", true);
   xhr.send(new FormData(input.parentElement));
 }
diff --git a/lang/en.php b/lang/en.php
index 9bada49..4e63834 100644
--- a/lang/en.php
+++ b/lang/en.php
@@ -115,6 +115,7 @@ $lang["owntrackswarn"] = "Your can only edit your own tracks";
 $lang["gmauthfailure"] = "There may be problem with Google Maps API key on this page";
 $lang["gmapilink"] = "You may find more information about API keys on <a target=\"_blank\" href=\"https://developers.google.com/maps/documentation/javascript/get-api-key\">this Google webpage</a>";
 $lang["import"] = "Import track";
+$lang["iuploadfailure"] = "Uploading failed";
 $lang["iparsefailure"] = "Parsing failed";
 $lang["idatafailure"] = "No track data in imported file";
 ?>
diff --git a/lang/pl.php b/lang/pl.php
index adca967..4ea2049 100644
--- a/lang/pl.php
+++ b/lang/pl.php
@@ -110,6 +110,7 @@ $lang["owntrackswarn"] = "Możesz edytować tylko swoje własne trasy";
 $lang["gmauthfailure"] = "Prawdopodobnie na tej stronie występuje problem z kluczem API Google Maps";
 $lang["gmapilink"] = "Więcej informacji o kluczach API znajdziesz <a target=\"_blank\" href=\"https://developers.google.com/maps/documentation/javascript/get-api-key\">pod tym linkiem</a>";
 $lang["import"] = "Importuj trasę";
+$lang["iuploadfailure"] = "Błąd przesyłania pliku";
 $lang["iparsefailure"] = "Błąd parsowania pliku";
 $lang["idatafailure"] = "Brak trasy w importowanym pliku";
 
diff --git a/utils/changepass.php b/utils/changepass.php
index abaf343..387b4a3 100644
--- a/utils/changepass.php
+++ b/utils/changepass.php
@@ -17,6 +17,7 @@
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
+  define("headless", true);
   require_once(dirname(__DIR__) . "/auth.php"); // sets $user
 
   /**
diff --git a/utils/getpositions.php b/utils/getpositions.php
index b1e95a7..6724650 100755
--- a/utils/getpositions.php
+++ b/utils/getpositions.php
@@ -17,6 +17,7 @@
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
+define("headless", true);
 require_once(dirname(__DIR__) . "/auth.php"); // sets $user
 require_once(ROOT_DIR . "/helpers/position.php");
 
diff --git a/utils/gettracks.php b/utils/gettracks.php
index 3f15bd1..8a8a38c 100755
--- a/utils/gettracks.php
+++ b/utils/gettracks.php
@@ -17,6 +17,7 @@
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
+define("headless", true);
 require_once(dirname(__DIR__) . "/auth.php"); // sets $user
 require_once(ROOT_DIR . "/helpers/track.php");
 
diff --git a/utils/handletrack.php b/utils/handletrack.php
index ad7bdd1..d112efe 100644
--- a/utils/handletrack.php
+++ b/utils/handletrack.php
@@ -17,6 +17,7 @@
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
+  define("headless", true);
   require_once(dirname(__DIR__) . "/auth.php"); // sets $user
   require_once(ROOT_DIR . "/helpers/track.php");
 
diff --git a/utils/handleuser.php b/utils/handleuser.php
index f2796c3..4084da3 100644
--- a/utils/handleuser.php
+++ b/utils/handleuser.php
@@ -17,6 +17,7 @@
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
+  define("headless", true);
   require_once(dirname(__DIR__) . "/auth.php"); // sets $user
 
   /**
diff --git a/utils/import.php b/utils/import.php
index 9450dce..0179e89 100755
--- a/utils/import.php
+++ b/utils/import.php
@@ -17,9 +17,19 @@
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
+define("headless", true);
 require_once(dirname(__DIR__) . "/auth.php"); // sets $user
 require_once(ROOT_DIR . "/helpers/track.php");
 require_once(ROOT_DIR . "/helpers/position.php");
+require_once(ROOT_DIR . "/helpers/utils.php");
+
+$uploadErrors[UPLOAD_ERR_INI_SIZE] = "The uploaded file exceeds the upload_max_filesize directive in php.ini";
+$uploadErrors[UPLOAD_ERR_FORM_SIZE] = "The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form";
+$uploadErrors[UPLOAD_ERR_PARTIAL] = "The uploaded file was only partially uploaded";
+$uploadErrors[UPLOAD_ERR_NO_FILE] = "No file was uploaded";
+$uploadErrors[UPLOAD_ERR_NO_TMP_DIR] = "Missing a temporary folder";
+$uploadErrors[UPLOAD_ERR_CANT_WRITE] = "Failed to write file to disk";
+$uploadErrors[UPLOAD_ERR_EXTENSION] = "A PHP extension stopped the file upload";
 
 /**
  * Exit with xml response
@@ -49,12 +59,31 @@ if (!$user->isValid) {
   exitWithStatus(true, $lang["servererror"]);
 }
 
-$sizeMax = 10 * 1024 * 1024; //FIXME: set to php limits
+if (!isset($_FILES["gpx"])) {
+  $message = $lang["servererror"];
+  $lastErr = error_get_last();
+  if (!empty($lastErr)) {
+    $message .= ": " . $lastErr["message"];
+  }
+  exitWithStatus(true, $message);
+}
+
 $gpxFile = NULL;
 $gpxUpload = $_FILES["gpx"];
-if ($gpxUpload["error"] == UPLOAD_ERR_OK && $gpxUpload["size"] < $sizeMax) {
+$uploadErr = $gpxUpload["error"];
+if ($gpxUpload["size"] > uUtils::getUploadMaxSize() && $uploadErr == UPLOAD_ERR_OK) {
+  $uploadErr = UPLOAD_ERR_FORM_SIZE;
+}
+if ($uploadErr == UPLOAD_ERR_OK) {
   $gpxFile = $gpxUpload["tmp_name"];
   $gpxName = basename($gpxUpload["name"]);
+} else {
+  $message = $lang("iuploadfailure");
+  if (isset($errorMessage[$uploadErr])) {
+    $message .= ": " . $errorMessage[$uploadErr];
+  }
+  $message .= " ($uploadErr)";
+  exitWithStatus(true, $message);
 }
 
 $gpx = false;
@@ -73,9 +102,6 @@ if ($gpx === false) {
   if (!empty($parserMessage)) {
     $message .= ": $parserMessage";
   }
-  if ($gpxUpload["error"] != UPLOAD_ERR_OK) {
-    $message .= " (" . $gpxUpload["error"] . ")";
-  }
   exitWithStatus(true, $message);
 }
 else if (empty($gpx->trk)) {