diff --git a/lib/simditor.js b/lib/simditor.js
index 0891d017..d25db2c5 100644
--- a/lib/simditor.js
+++ b/lib/simditor.js
@@ -883,6 +883,7 @@ InputManager = (function(_super) {
           pasteContent = _this._cleanPasteArea.val();
         } else {
           pasteContent = $('<div/>').append(_this._pasteArea.contents());
+          pasteContent.find('table colgroup').remove();
           _this.editor.formatter.format(pasteContent);
           _this.editor.formatter.decorate(pasteContent);
           _this.editor.formatter.beautify(pasteContent.children());
diff --git a/site/assets/scripts/simditor.js b/site/assets/scripts/simditor.js
index 0891d017..d25db2c5 100644
--- a/site/assets/scripts/simditor.js
+++ b/site/assets/scripts/simditor.js
@@ -883,6 +883,7 @@ InputManager = (function(_super) {
           pasteContent = _this._cleanPasteArea.val();
         } else {
           pasteContent = $('<div/>').append(_this._pasteArea.contents());
+          pasteContent.find('table colgroup').remove();
           _this.editor.formatter.format(pasteContent);
           _this.editor.formatter.decorate(pasteContent);
           _this.editor.formatter.beautify(pasteContent.children());
diff --git a/src/inputManager.coffee b/src/inputManager.coffee
index fcb4deb6..880a1615 100644
--- a/src/inputManager.coffee
+++ b/src/inputManager.coffee
@@ -295,6 +295,7 @@ class InputManager extends SimpleModule
         pasteContent = @_cleanPasteArea.val()
       else
         pasteContent = $('<div/>').append(@_pasteArea.contents())
+        pasteContent.find('table colgroup').remove() # clear table cols width
         @editor.formatter.format pasteContent
         @editor.formatter.decorate pasteContent
         @editor.formatter.beautify pasteContent.children()