diff --git a/4chan_x.user.js b/4chan_x.user.js
index 4b348f5ad..824fa3c7d 100644
--- a/4chan_x.user.js
+++ b/4chan_x.user.js
@@ -477,7 +477,7 @@
         size /= 1024;
         unit++;
       }
-      size = unit > 1 ? Math.round(a * 100) / 100 : Math.round(size);
+      size = unit > 1 ? Math.round(size * 100) / 100 : Math.round(size);
       return "" + size + " " + ['B', 'KB', 'MB', 'GB'][unit];
     }
   });
@@ -1692,7 +1692,7 @@
         var fileUrl, img, url,
           _this = this;
         this.file = file;
-        this.el.title = file.name;
+        this.el.title = "" + file.name + " (" + ($.bytesToString(file.size)) + ")";
         if (QR.spoiler) {
           $('label', this.el).hidden = false;
         }
diff --git a/script.coffee b/script.coffee
index 0dfe819ea..10c4869d7 100644
--- a/script.coffee
+++ b/script.coffee
@@ -366,7 +366,7 @@ $.extend $,
       if unit > 1
         # Keep the size as a float if the size is greater than 2^20 B.
         # Round to hundredth.
-        Math.round(a * 100) / 100
+        Math.round(size * 100) / 100
       else
         # Round to an integer otherwise.
         Math.round size
@@ -1261,7 +1261,7 @@ QR =
 
       QR.replies.push @
     setFile: (@file) ->
-      @el.title = file.name
+      @el.title = "#{file.name} (#{$.bytesToString file.size})"
       $('label', @el).hidden = false if QR.spoiler
       if file.type is 'application/pdf'
         @el.style.backgroundImage = null