What Are Gmail Annotations?
Google Annotations allow you to enhance your emails by displaying key promotional details such as images, discount offers, and expiration dates directly in Gmail’s Promotions tab. This means recipients can see the value of your offer before they even open the email, increasing the chances they’ll click through.
Despite being around for a few years, Gmail Annotations remain underutilized. Many email marketers don’t even know they exist, let alone how to implement them effectively. But those who do? They gain a competitive edge by making their emails more visually appealing and informative right from the inbox.
Types of Annotations
Gmail Annotations support three main types of enhancements to help your emails stand out:
Deal Annotations
Highlight promotions, discounts, or limited-time offers. You can display details like offer descriptions, promo codes, and expiration dates.
Product Carousels
Showcase multiple products within the email annotation, allowing users to scroll through images and get a preview of available items.
Single Image Preview
Feature a single image to visually enhance your email and entice recipients to engage.
Each of these elements helps cut through inbox clutter, increasing the likelihood that recipients interact with your message before they even open it.
Why Gmail Annotations Matter
In a world where inboxes are flooded with promotions, getting noticed is half the battle. Here’s why using Google Annotations can make a difference:
Higher Engagement – Emails with annotations provide valuable information upfront, making them more enticing to open.
Increased Click-Through Rates – Users can interact with elements directly in the Promotions tab, leading to more conversions.
Competitive Advantage – Few brands use this feature, so implementing it gives you a leg up on competitors.
Enhanced User Experience – Customers appreciate quick access to relevant details without extra effort.
Priority Inbox Placement – Gmail may prioritize emails with annotations, increasing their chances of being seen first.
How to Set Up Gmail Annotations
Setting up Gmail Annotations requires adding structured JSON-LD markup to your email’s HTML. Here’s a step-by-step guide:
Choose Your Annotation Type – Decide whether you want to implement a deal annotation, product carousel, or single image preview.
Add JSON-LD Code – Insert the required structured data in your email’s HTML. Here’s an example for a product carousel annotation:
For more, visit: developers.google.com/gmail/promotab/overview
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html>
<head>
<script type="application/ld+json">
[
// Build the first image preview in your product carousel:
{
"@context": "http://schema.org/",
"@type": "PromotionCard",
"image": "IMAGE_URL1",
"url": "PROMO_URL1",
// Optionally, include the following PromotionCard properties:
"headline": "HEADLINE1",
"price": PRICE1,
"priceCurrency": "PRICE_CURRENCY1",
"discountValue": DISCOUNT_VALUE1,
"position": POSITION
},
// Build the second image preview in your product carousel:
{
"@context": "http://schema.org/",
"@type": "PromotionCard",
"image": "IMAGE_URL2",
"url": "PROMO_URL2",
// Optionally, include the following PromotionCard properties:
"headline": "HEADLINE2",
"price": PRICE2,
"priceCurrency": "PRICE_CURRENCY2",
"discountValue": DISCOUNT_VALUE2,
"position": POSITION
}
// To include more image previews, add additional PromotionCard objects.
// You can include up to 10 image previews in a product carousel.
]
</script>
</head>
<body>
// The message of your email
</body>
</html>
Test Your Implementation – Use Google’s Email Markup Tester to validate your code before sending.
Send and Monitor Performance – Track engagement metrics to see the impact of annotations on your email performance.
NOTE: Annotations code may be ignored until you are added to the Google allowlist.
To request that Google add you to their annotations allowlist, send an email to p-Promo-Outreach@google.com with the following information:
- All domains (e.g., example.com)
- All subdomains (e.g., send.example.com, blog.example.com, marketing-messages.example.com)
- Your landing page URL(s) (e.g., your homepage)
Best Practices for Google Annotations
To maximize the impact of your email annotations, follow these best practices:
✔ Keep it relevant – Ensure that the details you highlight align with the recipient’s interests.
✔ Use high-quality images – Blurry visuals won’t entice clicks. Stick to clear, compelling graphics.
✔ Create urgency – Expiration dates and deal badges encourage users to act quickly.
✔ Test before sending – Validate your JSON-LD code using Google’s preview tool to avoid rendering issues.
✔ Monitor results – Track how your annotated emails perform compared to standard emails and adjust accordingly.
Final Thoughts
Google Annotations are an easy yet powerful way to enhance your email marketing efforts. By giving recipients a preview of your promotions directly in Gmail’s inbox, you boost visibility, engagement, and ultimately, conversions. Since so few marketers take advantage of this feature, now’s the perfect time to get ahead of the curve.
Want to make sure your email campaigns are optimized to their full potential? Let’s chat
