ActiveCampaign: Import / migrate contacts
2 walk-throughs of this task.
4:221:30Importing contacts via CSV in ActiveCampaignDemonstrates how to upload a CSV file to bulk import contacts, including mapping fields like email, name, and phone number.@tech.express
1:001:19Importing contacts and list setupShows how to create a list and import contacts from CSV files or third-party integrations like Google.@Soft-Savvy

Klaviyo
Kit
Beehiiv
Mailchimp