Customers trust other customers more than brand promises. Reviews are social proof — they can make or break whether someone clicks “buy” or scrolls on.

By connecting Trustpilot with Klaviyo, you can automatically include real reviews in your emails and SMS, helping nurture trust and lift conversion rates. You’ll turn passive feedback into active persuasion.

What This Guide Covers:

• Step-by-step setup of Trustpilot ↔ Klaviyo integration

• How to insert Trustpilot review widgets into Klaviyo campaigns

• Filtering options: star ratings, product vs. service reviews

• Use-case campaigns to drive ROI (welcome, cart abandonment, reviews)

• Troubleshooting and best practices

Why Integrate Trustpilot with Klaviyo?

Integrating Trustpilot with Klaviyo transforms customer reviews from static web content into dynamic, revenue-driving marketing assets. Instead of manually pasting testimonials, you can automatically feature the freshest reviews in flows and campaigns. This adds authenticity to your messages while reducing the friction of trust-building.

Key benefits include:

• Dynamic social proof: The Trustpilot widget auto-updates to display your most recent reviews that meet chosen filters (star rating, product/service type, keywords).

• Relevance across lifecycle: Embed five-star product reviews in abandoned cart flows, or highlight glowing service reviews in post-purchase emails.

• Conversion lift: Emails with embedded ratings and quotes often see higher click-through rates and improved conversion.

• Scalable trust: Every message reinforces credibility, without extra manual work.

Source: Trustpilot

In short, Klaviyo handles distribution while Trustpilot delivers authentic customer validation. Together, they help reduce doubt and drive ROI across campaigns.

For more ways to strengthen credibility across the customer journey, see our guide on Klaviyo Transactional Emails, which shows how clear communication can cut support tickets and boost trust.

How to Set Up the Klaviyo Trustpilot Integration

Integrating Trustpilot with Klaviyo takes just four steps: connect your accounts, customise your widget, link the data feed, and embed the widget into campaigns. Once complete, you’ll be able to display dynamic reviews across Klaviyo emails.

Step 1: Connect Trustpilot with Klaviyo

1. In Klaviyo, go to Settings > Account > API Keys.

2. Create a Private API Key (name it, select Metrics and Campaigns, then click Create).

3. Copy the key.

4. In Trustpilot Business, go to Integrations > Marketing > Klaviyo, paste the key, and click Connect.

Step 2: Customise Your Widget

1. Go to Trustpilot > Integrations > Marketing > Klaviyo > Customise your widget.

2. Choose Product Reviews (enter SKUs) or Service Reviews.

3. Select a layout, then filter by tags, star ratings, or number of reviews.

4. Changes save automatically. Note: only one widget can be active, and updates apply across all campaigns.

Step 3: Connect the Data Feed

1. Copy the Data Feed URL in Trustpilot.

2. In Klaviyo, go to Settings > Other > Web Feeds > Add Web Feed.

3. Paste the URL, set Request Method = GET and Content Type = XML, then save.

Step 4: Add the Widget to Campaigns

1. In Klaviyo, create or edit a campaign, then add a Text block.

Source: Trustpilot 

2. In Trustpilot, copy the widget code.

3. In Klaviyo, paste it into the Text block’s Source code, replacing ##FEED_NAME## with your Web Feed name.

4. Preview the email, finalise your campaign, and send (or A/B test).

Note: Native integration is widget-based only. Review data is not stored as Klaviyo profile properties. For advanced use (e.g. “Review Submitted” events), use the Trustpilot API or Zapier.

If you’re setting up other integrations alongside Trustpilot, our Shopify x Klaviyo Integration Guide walks you through how to ensure smooth data syncing across your stack.

Profile Properties Synced with Klaviyo

A common misconception is that the Trustpilot integration pushes review data into Klaviyo customer profiles. In reality, the integration only supports widget-based display at send time — no review text or rating is written to profile properties. This means you cannot segment directly on “left a 5-star review” without extra setup.

For brands that want deeper control, there are two workarounds:

• Trustpilot APIs: Developers can use the Service Review API to pull review details and pass them into Klaviyo as custom properties or metrics.

  
  

Source: Trustpilot

• Zapier integration: Non-technical teams can set up Zaps that push “New Review Submitted” into Klaviyo as a custom event, unlocking segmentation and automation possibilities.
  
  

If your goal is simply to showcase reviews in emails, the native widget is enough. But if you want to act on review behaviour (e.g., sending loyalty points to 5-star reviewers), you’ll need API or Zapier-based workflows.

This approach is similar to how we extend customer insights using Klaviyo Custom Properties, where profile-level data unlocks advanced segmentation and personalisation.

Events & Triggers — What’s Actually Supported

Unlike integrations such as Okendo or Yotpo, the native Trustpilot to Klaviyo connection does not push review submission events. This means you cannot natively trigger a Klaviyo flow when someone leaves a review. Instead, the integration is widget-only.

Workarounds if you need events:

• Zapier: Create a Zap where “New Review Submitted” in Trustpilot triggers “Create Event in Klaviyo.” You can then build flows around this event.

Source: Zapier

• Custom API: Use Trustpilot’s Service Review APIs to fetch review data and send it into Klaviyo’s Track API as custom metrics.

For most brands, widget-based display covers 80% of use cases. But if your strategy requires rewarding reviewers or segmenting based on feedback, these workarounds are essential.

If you want to dive deeper into setting up advanced automations, check out our post on Klaviyo Flow Triggers, which explains how to build smarter lifecycle flows with custom events.

Campaign & Flow Examples with Reviews

Embedding Trustpilot reviews isn’t just a cosmetic play — it’s a strategy that drives measurable retention and conversions. By aligning reviews with lifecycle flows, you can reassure customers exactly when they need it most.

Top 5 practical applications:

• Post-purchase: Embed a live widget and invite customers to leave their own review.

• Cart abandonment: Showcase 5-star product reviews to overcome objections.

• Welcome flows: Highlight service reviews that demonstrate reliability.

• Win-back: Use positive testimonials to rebuild trust with inactive buyers.

• Promotions: Add urgency by combining discount offers with recent customer praise.

For abandoned cart flows, pairing reviews with urgency works especially well — see our guide on Klaviyo’s SMS Abandoned Cart for examples of how SMS + reviews can reduce drop-off.

This layered approach ensures reviews don’t just sit on your website — they actively influence customer behaviour in Klaviyo campaigns.

Explore 8 Essential Klaviyo Flows to see how reviews can strengthen lifecycle messaging. And see how post-purchase emails can be structured in 10 Post-Purchase Email Examples.

Troubleshooting & Best Practices

Even well-built integrations occasionally run into issues. This table outlines the most common problems, their likely causes, and verified fixes so your Trustpilot reviews display smoothly in Klaviyo.

Best Practices for Success

• Keep review snippets concise (under 150 characters for email clarity).

• Use star icons for instant recognition and trust-building.

• Verify permissions/consent before publishing reviews.

• Always test on mobile to ensure widgets display correctly.

You can also improve deliverability and consistency by following our Email Deliverability Checklist, which ensures review-rich campaigns actually land in inboxes.

Measuring ROI of Review Integration

Adding reviews isn’t just about aesthetics — it’s about measurable results. To prove value to stakeholders, track key metrics that show the impact of reviews on revenue.

Metrics to track:

• CTR uplift: Compare campaigns with reviews vs. without.

• Conversion rate lift: Measure completed purchases after embedding reviews.

• Revenue per recipient: Assess flow performance when reviews are included.

• Review submission rate: If using Zapier/API to request reviews, track participation growth.

To get deeper insight, run A/B tests inside Klaviyo — one version with embedded reviews, one without. This quantifies the incremental lift. For full reporting, you can build dashboards using Klaviyo’s reporting suite.

For step-by-step reporting, see our guide on Klaviyo Custom Reports, and if you’re testing campaigns with vs. without reviews, our Klaviyo Split Testing Guide shows how to run statistically sound experiments.

FAQs

1.  Do I need a specific Trustpilot plan to use the Klaviyo integration?

• Yes. The Klaviyo integration is available on Trustpilot Business plans that include marketing integrations (Plus, Premium, Advanced, Enterprise).

2. Can I choose which reviews appear in my emails?

• Absolutely. Use filters to show only 4–5 star reviews, product-specific reviews, or reviews that include certain keywords.

3. Will the widget slow down my email loading times?

• No. Trustpilot’s widget is lightweight and designed to load quickly within Klaviyo campaigns.

4. Can I use reviews in SMS campaigns too?

• Yes. While widgets are email-focused, you can extract snippets of review text and star icons to include in SMS for quick social proof.

5. How often do reviews refresh in Klaviyo campaigns?

• Reviews refresh automatically, ensuring your campaigns always show the most recent customer feedback that matches your filter settings.

Conclusion

Customers are quick to trust other buyers, but slow to trust brands on their own. Without visible reviews, emails risk feeling one-sided and less credible. The Klaviyo–Trustpilot integration solves this by pulling authentic, fresh reviews into your campaigns automatically. This builds trust at key decision points, reduces hesitation, and drives repeat sales. 

If you’ve been struggling to prove the ROI of reviews or to add more authenticity to your lifecycle flows, this integration is the fastest way to get there. With the right setup, your social proof works as hard as your offers — keeping customers engaged, confident, and coming back.

Key Takeaways

• Dynamic social proof: Embed auto-updating Trustpilot reviews in Klaviyo emails.

• Filter for relevance: Choose reviews by star rating, product vs service, or keywords.

• Boost lifecycle flows: Add reviews to welcome, cart abandonment, and post-purchase campaigns.

• Extend with APIs: Use Trustpilot API or Zapier for events like “Review Submitted.”

• Measure impact: Track CTR, conversion rate, and revenue per recipient to prove ROI.

Struggling to prove the ROI of your reviews?

With the Klaviyo + Trustpilot integration, you can turn customer feedback into automated email and SMS content that encourages clicks, conversions, and revenue. Our experts will guide you through the process; click here to schedule your free audit now.