How to preview and send test emails in Klaviyo

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Learn about all the ways to preview and test emails in Klaviyo, so you can be confident in how your email will appear in each recipient’s inbox.

After you design a new email, there are several ways to preview and test how your email will look when sent live:

  • Preview in Klaviyo
  • Send a preview email
  • Send a live campaign to a preview list
  • Test your email with a third-party tool

Keep in mind that the options available when previewing will depend on whether your email was created as an email template, a flow email, or a campaign.

If you are interested in previewing how your email will render across different email clients and devices, skip to the Testing with a Third-Party Tool section.

How to preview an email in Klaviyo

Klaviyo’s new template editor

Access Klaviyo’s new template editor from the Email Templates tab by clicking Create Template > Use New Editor. After creating a template with the new editor, you can customize and send it as a campaign or use it in flow emails by selecting the new template in the campaign or flow setup process.

In the coming weeks, you’ll have the option to convert your existing email templates to the new template editor as well.

To preview a campaign or a list-, segment-, or date-triggered flow email in the new template editor: 

  1. Click Preview and test from the template editor 
  2. Click Search for a profile and enter the email of a profile that includes the variable you’d like to add 
  3. Preview the message in Klaviyo’s previewer or click Send Test to send a test to your inbox
  4. Click Done to return to the editor

To preview an event-triggered flow email: 

  1. Click Preview and test from the template editor 
  2. Under Preview data source, click Event
  3. Select an event from the dropdown
  4. If needed, use the arrows to the right of Previewing with recent event: to preview different instances of the event
  5. Preview the message in Klaviyo’s previewer or click Send Test to send a test to your inbox
  6. Click Done to return to the editor

While previewing the email in Klaviyo’s preview modal, you have a few previewing options: 

  • Desktop/Mobile
    Toggle between desktop and mobile views of your message
  • Preview data source
    Choose between previewing with Profile data (for emails sent as campaigns or list-, segment-, or date-triggered flows)
  • Send Test
    Use this button to send an email to your own inbox

Sending a preview email will allow you to test how an email will render when viewed in your own inbox. Keep in mind, however, that message variables (such as manage preferences and unsubscribe links) and dynamic coupons will not render in previews, rather than functional links or coupons. Klaviyo will also not apply Google Analytics tracking variables or click tracking to links in a preview email. 

You can send previews to multiple email addresses by separating the addresses with a comma. 

Klaviyo’s classic editor

  1. Click the Preview button on the left-hand sideThe preview button in Klaviyo's classic template editor
  2. Choose one of the two different previewing options:
    • If you select Show directly in Klaviyo and click Preview Now, you'll see a preview window featuring your email
    • If you select Send as an email and click Preview Now, a preview email will be sent to the email address you specified

Sending a preview email will allow you to test how an email will render when viewed in your own email client. Keep in mind, however, that message variables (such as manage preferences and unsubscribe links) and dynamic coupons will not render previews, rather than live links or coupons. Klaviyo will also not apply Google Analytics tracking variables or click tracking to links in a preview email. 

You send previews to multiple email addresses by separating the addresses with a comma. 

Preview email limits

Email preview limits are applied per account relative to your email billing plan. Free plans may send 100 preview emails per billing cycle. Paid plan preview limits vary based on the total number of profiles covered by your plan. 

To see your current billing plan, navigate to Account > Billing > Email Plans

Plan size

Preview email limit (per billing cycle)

Up to 5,000 profiles

1,000 preview emails

5,001 - 45,000 profiles

2,500 preview emails

45,000 - 1,000,000 profiles

10,000 preview emails

1,000,001+ profiles

25,000 preview emails

Sending a live campaign to a preview list

When you send a preview email as described above, message variables (such as manage preferences and unsubscribe links) and dynamic coupons will not render previews, rather than live links or coupons. Klaviyo will also not apply Google Analytics tracking variables or click tracking to links in a preview email. If you are interested in testing how these will appear and function in your email, we recommend sending a live test email.

  1. Create a new list titled "Preview" (or similar)
  2. Use the Quick Add button to add yourself or members of your team
    A user adds an email to a list using the Quick Add feature
  3. Ensure your new email is saved as a template if you did not design your email directly in the Email Templates tab
  4. Create a new campaign by navigating to Campaigns > Create Campaign
  5. Name the campaign
  6. Choose your preview list under Send to
  7. Click Continue to Content
  8. Configure your message details, including a subject line and from address. 
  9. Navigate to Drag and Drop > My Templates
  10. Choose the template you want to preview
  11. Click Continue to Review > Schedule and Send

The email you receive will contain live links, and will provide an accurate preview of what your contacts will see when they receive the same message.

Messages sent as campaigns will not contain the dynamic event content available within metric-triggered flows. To send a live metric-triggered flow email that populates all event details, you must trigger the flow yourself by taking the trigger action. 

Testing with a third-party tool

If you are concerned about how your email design will render across different email clients and devices, using a third-party email testing tool can help.

We recommend exploring the use of a tool like Litmus, which offers a free trial as well as monthly paid plans. You can also search for free alternatives that allow you to test and preview how your emails will look when viewed by recipients using different email clients and devices.

While it isn't always possible to optimize an email design for all email clients and devices, understanding the differences in how emails render can be useful as you test different variations.

Mobile optimization relies on media queries, which are fully supported by Apple Mail for Android and iOS and Samsung Email for Android, and partially supported by Gmail for iOS and Android and other mobile email apps. Learn more about support for media queries.

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