Put your finished HTML email into your email platform
You do not need to understand the code. Select your platform in the builder first, then follow the matching steps below. Menu names were checked against each platform's official help center in July 2026.
Before you export
- Choose your email platform at the top of the builder.
- Replace every sample name, event, image, link, and contact detail.
- Use Preview, then fix every warning that matters to your email.
- Use Copy HTML or Download as shown below.
Mailchimp
Use Copy HTML- Choose Mailchimp in the Template Treasures builder before you export.
- In Mailchimp, go to Campaigns, choose Create, name the email, and choose Use HTML to code my own.
- Choose Paste in Code, paste the copied HTML, then Save and Continue.
- Preview the email and send yourself a test before sending to your list.
Important: Mailchimp currently limits Paste in Code to Standard plans or higher and opens it in the legacy builder.
Open Mailchimp's official instructions →ActiveCampaign
Use Copy HTML- Choose ActiveCampaign in the Template Treasures builder before you export.
- In ActiveCampaign, open Email and choose Start from scratch instead.
- Enter the campaign details, open the menu beside Create with email designer, and choose HTML builder.
- Choose Start from Scratch, paste the copied HTML into the code pane, then preview and send a test.
Important: ActiveCampaign shows the rendered preview beside the code while you work.
Open ActiveCampaign's official instructions →Klaviyo
Use Download- Choose Klaviyo in the Template Treasures builder before you export.
- Download the .html file.
- In Klaviyo, go to Content, Templates, and the Email templates tab, then choose Import.
- Name the template, upload the downloaded .html file, and choose Import Template.
- Preview the imported template and send yourself a test.
Important: Klaviyo requires its own unsubscribe and personalization tags; selecting Klaviyo before export supplies those tags.
Open Klaviyo's official instructions →Constant Contact
Use Copy HTML- Choose Constant Contact in the Template Treasures builder before you export.
- In Constant Contact, go to Channels, Emails, and Create an email.
- Choose Paste your own code or Paste HTML code.
- Paste the copied HTML into the custom-code editor, save it, then use Check & Preview to send a test.
Important: If Constant Contact shows starter body tags, replace the starter code with the complete Template Treasures HTML instead of nesting one body inside another.
Open Constant Contact's official instructions →Always send a test first
Open the test on a phone and desktop. Check the subject line, preview text, every event link, the unsubscribe link, your address, and every image before sending to customers.