Testing email HTML size

Why it is important to test the HTML weight of your campaigns

As you can see in our article here, Gmail 'clips' emails above 102KB.

This can result in key content within your campaigns getting missed, and negatively impacts the performance of your emails.

How to test email HTML weight

The easiest and most reliable way to check your email size in Ecosend is to send yourself a test campaign.

Steps

  • In EcoSend, open your Broadcast or Automation

  • Click “Send Test”

  • Direct the test email to a Gmail address

  • Open the email in Gmail

  • Review if the message has been clipped

If your email is visibily clipped, review our article here for steps on how to reduce the email size, and improve the performance of your campaign 💪

Last updated March 2026

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