1 GiB limit -> 512 MiB just to be extra safe

Author: HACKERALERT

index.html

@@ -120,8 +120,8 @@
 			};
 			document.getElementById("fin").onchange = function(){
 				if(this.files.length>0){
-					if (this.files[0].size > 1073741824) { // 1 GiB
-						document.getElementById("status").innerHTML = "File must be less than 1 GiB!";
+					if (this.files[0].size > (1073741824 / 2)) { // 512 MiB
+						document.getElementById("status").innerHTML = "File must be less than 512 MiB!";
 						document.getElementById("status").style.color = "#db2828";
 						setTimeout(() => {
 							window.location.reload();