Klaviyo & Facebook Integration Guide

Klaviyo and Facebook work together to extend your email marketing reach into paid social channels. If you’re already using Klaviyo to segment customers and build email campaigns, the Facebook integration lets you take those same audiences and target them with ads on Facebook and Instagram. This is especially useful for e-commerce brands that want to retarget customers who’ve engaged with emails but haven’t purchased, or to reach lookalike audiences based on your best customers.

How the Integration Works

The Klaviyo-Facebook integration operates as a one-way sync from Klaviyo to Facebook, with conversion data flowing back. Here’s what happens under the hood:

• Audience Sync: You select a Klaviyo list or segment in Klaviyo’s interface and map it to a Facebook Custom Audience. Klaviyo automatically pushes subscriber email addresses (hashed for privacy) to Facebook, creating or updating that audience in real time as people join or leave your Klaviyo list.
• Ad Targeting: Once synced, you use those Klaviyo-powered audiences directly in Facebook Ads Manager to create targeted campaigns. You can build ads that speak to specific customer behaviors—like “people who clicked an email about our sale” or “customers who abandoned their cart.”
• Conversion Tracking: The integration includes a Facebook Pixel connection so Klaviyo can track when people who see your Facebook ads complete a purchase or other conversion event on your website. This data flows back into Klaviyo for reporting and campaign optimization.
• Lookalike Audiences: Facebook uses your synced Klaviyo audience as a seed to create Lookalike Audiences—new potential customers who behave similarly to your best subscribers. This expands your reach beyond your existing list.
• No Manual CSV Uploads: Instead of exporting lists from Klaviyo and manually uploading them to Facebook every time your audience changes, the integration keeps everything synchronized automatically.

Key Features & Capabilities

Here’s what you can actually do once the integration is live:

• Retarget Email Subscribers: Build a Facebook campaign targeting only the people who opened your last email campaign but didn’t click through. This bridges email and paid social for higher conversion rates.
• Segment-Based Audiences: Sync any Klaviyo segment—customers who spent over $100, people in a specific geographic location, or subscribers who haven’t purchased in 90 days—directly to Facebook as a Custom Audience. No need to manually create these in Facebook.
• Win-Back Campaigns: Identify inactive subscribers in Klaviyo and sync them to a Facebook audience, then run low-cost ads to re-engage them before removing them from your list.
• Lookalike Expansion: Use your high-value customer segment from Klaviyo as the foundation for a Facebook Lookalike Audience, reaching thousands of new prospects who match your best customers’ profiles.
• Cross-Channel Attribution: Track which Facebook ads led to purchases, then see that data reflected in Klaviyo’s campaign performance reports. This helps you understand the full customer journey across email and social.
• Dynamic Product Ads: Combine Klaviyo’s product data with Facebook’s dynamic ads to show personalized product recommendations to people based on what they’ve browsed or purchased.

Setup Difficulty

Medium (15–30 minutes, some configuration required)

Setting up the integration involves a few steps but doesn’t require coding. You’ll need to:

1. Connect your Facebook Business Account to Klaviyo by authorizing the app in Klaviyo’s integrations dashboard.
2. Install the Facebook Pixel on your website (or confirm it’s already installed if you’ve been running Facebook ads).
3. Select which Klaviyo lists or segments you want to sync to Facebook.
4. Map those segments to new or existing Facebook Custom Audiences.
5. Test the sync by checking that a small audience appears in Facebook Ads Manager within a few minutes.

The main time investment is understanding which Klaviyo segments make sense to sync and setting up your Facebook Business Account correctly if you haven’t already. If you’re new to Facebook Ads Manager, you may want to spend extra time learning the platform, but the Klaviyo side is straightforward.

Alternatives to Native Integration

If the native Klaviyo-Facebook integration doesn’t fully meet your needs, consider these options:

• Zapier or Make: Use a no-code automation platform to trigger Facebook Custom Audience updates based on Klaviyo list changes, or to log Facebook ad performance back into Klaviyo. This adds flexibility if you need custom logic, though it may introduce slight delays compared to native sync.
• Facebook Conversions API: If you need more granular server-side conversion tracking beyond what the Pixel provides, you can use Facebook’s Conversions API in combination with Klaviyo to send purchase and event data directly to Facebook without relying on browser cookies.
• Third-Party CDP: Platforms like Segment or mParticle sit between Klaviyo and Facebook, allowing you to build more complex audience rules and sync to multiple ad platforms at once. This is overkill for most small-to-mid-sized businesses but useful if you’re managing audiences across many channels.

Frequently Asked Questions

How often does Klaviyo sync audiences to Facebook?

Klaviyo syncs audiences to Facebook in near real-time, typically within a few minutes of a subscriber being added to or removed from a list or segment. Facebook may take an additional few hours to fully process and activate the audience for ad targeting, but the data transfer from Klaviyo is immediate.

Can I sync all my Klaviyo subscribers to Facebook, or just specific segments?

You can sync any Klaviyo list or segment. Most businesses sync specific segments (e.g., “High-Value Customers,” “Cart Abandoners,” “Email Openers”) rather than their entire subscriber base, because targeted audiences perform better in ads. You can set up multiple syncs to different Facebook Custom Audiences if needed.

What data does Klaviyo send to Facebook?

Klaviyo sends hashed email addresses to Facebook to match against Facebook user accounts. It does not send passwords, phone numbers, or other sensitive personal data. Facebook uses these hashed emails to identify which of its users match your Klaviyo audience, then targets ads to those people.

Do I need a Facebook Pixel for this integration to work?

Yes, the Facebook Pixel is required to track conversions (purchases, signups, etc.) that result from your Facebook ads. Without it, you won’t be able to measure ROI or attribute sales back to your campaigns. Klaviyo’s integration setup will guide you through installing the Pixel if you haven’t already.

Important Disclaimer

Integration features and capabilities may change as Klaviyo and Facebook update their platforms. Always verify the current state of this integration on Klaviyo’s official integration documentation and Facebook’s developer resources before making business decisions based on this guide.