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Add a missing Tracking Pixel tag to a custom code email

Article: 000034514
Updated: June 11, 2025

Insert a tag to track the email opens for your custom HTML code email

Exclamation Point IconImportant: Even though your email includes a Tracking Pixel, there are a few instances when email opens aren’t trackable.
 

To track email opens, a transparent, single-pixel image is embedded into every email that's sent. When a contact opens your email, a call is made to our server to load the email content, including the image pixel, and it’s counted as a unique open.

When you create an email in the Custom Code editor, this image pixel (or Tracking Pixel tag) is automatically included in the placeholder HTML. If you’re missing the Tracking Pixel tag, you’ll receive an error and won’t be able to send your email until it’s resolved. 

If the Tracking Pixel tag was accidentally deleted from the HTML, it’s easy to re-insert it:

  1. Place your cursor where you want to add the Tracking Pixel tag and click Insert > Tracking Pixel. 
    Note: Since the Tracking Pixel is invisible, it doesn’t matter where you insert it in the code, as long as it’s within the <html> opening and closing tags.

    Insert drop-down and Tracking Image option

The [[TrackingImage]] tag is now inserted into the code and when contacts open your email, they are included in the open rate.

 
Light Bulb IconDid You Know? Link tracking is automatic in custom code emails and doesn't require any additional code.

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