An email message is made up of all the underlying code. An email's code includes: text, HTML, CSS styling, links, images, and more. Gmail "clips" email messages greater than 102KB in size. When this happens, you will see this at the bottom of the email:
One of the most common reasons why emails are clipped is due to having too much content. To avoid this, we recommend removing any unnecessary content from your email templates.
To determine whether your email is too large and would be clipped, send yourself a test email, download it, and check the size on your desktop. See "Common Questions" below for details. We recommend creating a copy of your email to have as a backup before trimming down and making edits to your email template.
Other reasons why an email message might be clipped:
- Sending multiple emails with the same subject line - Gmail will often combine emails with the same subject line into a single email known as "threads". For example, if a customer received two emails with the same subject line "100% OFF on all Appliances", the emails will be "threaded" causing it to exceed the 102KB threshold.
- Copying and pasting content from an external source - By including pasted content from external sources such as a blog or word-processing program, hidden formatted code can be injected into your email template.
How is 1KB measured?
Every character of code makes up of about 1-2 byte(s). 1KB = 1000 bytes. Take a look at the code snippet below:
<h1>Welcome to ReSci</h1>
The code snippet above contains approximately 50 bytes.
How do I check the file size of an email message?
- Open the email in your inbox. Click the three dots in the upper-right corner and click Download message.
- The downloaded file will appear at the bottom of your screen. Click the arrow and then click Show in folder.
Note: If the downloaded file does not appear at the bottom of your screen, navigate to your Downloads folder within the File Explorer.
- Look for the size of the downloaded email message.