Learn which date and time formats Klaviyo recognizes in event and profile data sent through our APIs or in a CSV upload. Note that this does not apply to an event timestamp sent via the Track API, which must be unix time in seconds.

Learn about frequently asked questions related to identity resolution in Klaviyo. If you don’t see your question in the resource below, please reach out on our Community forum.

Learn how to delete, merge, and export profiles in Klaviyo in order to keep your account organized. For general information about profiles, head to our article on profiles in Klaviyo .

Learn how to export all of the people in your account by creating a segment of those profiles and exporting that segment to a CSV file. This CSV file will contain all profiles, regardless of subscription status.

This method of adding profile properties to Klaviyo requires that you upload contacts to a list. If your file includes contacts that have not explicitly opted in to email or SMS marketing, exercise caution to ensure you don’t send those contacts unwanted messages, as this can hurt your deliverability. Learn more about deliverability.

Learn how to suppress a group of profiles in Klaviyo in bulk, remove suppressions in bulk, or delete profiles in bulk, and how the suppression modal helps you avoid suppressing recently active, high‐intent profiles. You will also learn how suppression recommendations on the Suppressed profiles page help you safely suppress low‐value, long‐term inactive profi

Learn how to email a single recipient in Klaviyo. To learn how to send a message to a group of contacts all at once, head to guide to creating and sending an email campaign .

Learn how to bulk remove profile properties from profiles in Klaviyo. If you have a profile property that you’d like to remove for a group of profiles, you can do this using a CSV upload.

Multi-Email Profiles (MEP) is a Klaviyo feature that lets you store and manage up to 5 email addresses on a single customer profile. Instead of your customers appearing as multiple separate profiles every time they use a different email, Klaviyo keeps everything in one place so you always have a complete, accurate picture of who they are.

Learn about the difference between custom and Klaviyo properties, how to use them to track information about your subscribers, how to remove them, best practices, and more.

The glossary below defines common terms regarding profiles and properties in Klaviyo.

Learn about the source ($source) profile property to better understand how your subscribers signed up. Klaviyo automatically assigns a $source property for profiles added using certain methods. For example, a profile’s $source is set to API if they were added through Klaviyo’s API , or set to Manually Initiated if you added them manually.

Learn about anonymous visitor activity backfilling and how to capture shoppers’ onsite engagements before they are identified.

Learn more about the different types of predictive analytics data displayed in your account, the various ways Klaviyo computes this, and guidelines for how you can utilize this data.

Learn about active email profiles, including how they differ from suppressed email profiles , and how you can contact the people represented by these profiles.

Learn how to manage active profiles in your Klaviyo account and reduce the number of billable profiles by suppressing those that have not engaged with your business for a sustained period of time.

Learn about using channel affinity to better personalize your marketing. Channel affinity gives you information on a profile’s expected engagement with different marketing channels.

Learn how to understand consent in profiles and best practices for email and SMS compliance.

Learn about custom properties in Klaviyo that you can use to store information about the contacts in your account. Here are several examples of how you might use custom properties:

Learn about the different options available for storing your data in Klaviyo, and how to use each one. Klaviyo allows you to harness the data collected about your customers to power data-driven marketing choices that will grow your brand. That being said, it's important to understand the data that's being pulled into your account.

Learn about identity resolution in Klaviyo, which consolidates customers’ interactions across multiple channels under a single record.

Learn about profiles, including how to find them and the data available on the profile page. Profiles are used to keep track of all the information you have about your customers and prospects.

Learn about suppressed email profiles, including how they differ from active profiles and how you can use these profiles to better understand your audience.

Learn about the information section of a profile in Klaviyo, which contains details such as when and how the profile found you and the last time they were active.

Learn where to find location information for a profile, how it is used and updated, and more. When syncing or creating a new profile, Klaviyo determines the location and timezone information based on the profile's billing address. If a profile hasn't purchased, location and timezone are determined based on IP geolocation.