diff --git a/src/web/LoaderWorker.js b/src/web/LoaderWorker.js
index 97b4dc59..7df3cf05 100755
--- a/src/web/LoaderWorker.js
+++ b/src/web/LoaderWorker.js
@@ -49,12 +49,11 @@ self.addEventListener("message", function(e) {
  */
 self.loadFile = function(file, inputNum) {
     const reader = new FileReader();
-    let data;
-    try {
-        data = new Uint8Array(file.size);
-    } catch (err) {
-        self.port.postMessage({"error": err, "inputNum": inputNum});
+    if (file.size >= 256*256*256*127) {
+        self.port.postMessage({"error": "File size too large.", "inputNum": inputNum, "id": self.id});
+        return;
     }
+    const data = new Uint8Array(file.size);
     let offset = 0;
     const CHUNK_SIZE = 10485760; // 10MiB
 
@@ -63,7 +62,7 @@ self.loadFile = function(file, inputNum) {
             self.port.postMessage({"fileBuffer": data.buffer, "inputNum": inputNum, "id": self.id}, [data.buffer]);
             return;
         }
-        // self.port.postMessage({"progress": Math.round(offset / file.size * 100), "inputNum": inputNum});
+        self.port.postMessage({"progress": Math.round(offset / file.size * 100), "inputNum": inputNum});
         const slice = file.slice(offset, offset + CHUNK_SIZE);
         reader.readAsArrayBuffer(slice);
     };