What is Destination URL Auto-tagging?
When using Adwords, Google will automatically add Auto-Tagging to your URLs if you do not customize your options. This will cause all your links ending in ".html" to fail when google adds thier tags to them. This article will explain this in depth and provide instructions on how to change these settings to have your links from google work properly.
In order for Google Analytics to display details about your AdWords keywords and costs, you must do one of the following:
Auto-tagging appends a unique ID to the end of the destination URL. This unique ID allows Analytics to report the details of the click: which AdWords keywords brought a visitor to your site, which campaign that keyword was from, and how much that click cost your account. You can calculate return-on-investment (ROI) by associating this data with goals or e-commerce conversions.
The parameter used in auto-tagging is called "gclid" and will show up in your landing page URL when a user arrives at your site from your ad. For example, if your site is www.mysite.com, when a user clicks on your ad it will appear in the address bar as:
Auto-tagging is selected by default when linking your AdWords and Analytics accounts. You can manually enable or disable auto-tagging in AdWords.
To enable/disable auto-tagging:
To determine if auto-tagging will work for your website:
If the resulting page does not contain gclid=test,please notify your webmaster and refer to google's troubleshooting guide (in English only).
If you would rather track your clicks manually, please read How do I tag my links?