✓ TestedWorks with CSV, Excel, Google Sheets → JSON-LD Schema
By dataclean.to team · 2026-02-12
ActiveCampaign contact lists grow through form submissions, integrations, and manual imports, and each channel creates its own duplicate entries. A subscriber who signs up via your landing page and later fills out a webinar form ends up as two separate contacts with different tags and automation histories. dataclean.to identifies and merges these duplicate contacts so your automations trigger correctly and your billing reflects actual subscriber counts.
The Problem
ActiveCampaign charges based on contact count, so duplicates directly increase your monthly bill. Beyond cost, duplicate contacts cause automation failures: a lead might receive the same onboarding sequence twice, or a customer tagged as 'purchased' in one record keeps getting sales emails because their other record lacks that tag. Merging contacts manually inside ActiveCampaign is tedious because the platform only flags exact email matches, missing duplicates where someone used john@gmail.com on one form and john.doe@gmail.com on another. ActiveCampaign documentation on managing contacts
How to Fix It
1
Export contacts from ActiveCampaign
Navigate to Contacts in ActiveCampaign and export your full contact list as a CSV. Include email, first name, last name, tags, lists, and any custom fields you use for segmentation.
2
Upload to dataclean.to
Upload the exported CSV. The tool detects email columns and identifies duplicate clusters based on email similarity, name matching, and phone number overlap.
3
Review flagged duplicates
Examine each duplicate group. dataclean.to shows which fields differ between records, such as conflicting tags, different list memberships, or mismatched custom field values, so you can make informed merge decisions.
4
Merge duplicate records
Consolidate duplicates into single contacts. Tags from all duplicate records are combined, and the most recent custom field values are preserved. The tool creates a clean master record for each unique subscriber.
5
Reimport the deduplicated list
Download the cleaned CSV and import it back into ActiveCampaign. Use the 'Update existing contacts' option to overwrite duplicates with merged records without creating new entries.
Frequently Asked Questions
Will merged contacts keep all their tags?
Yes. When dataclean.to merges duplicate contacts, it combines tags from all matching records into the single merged entry. No tags are lost during the consolidation process.
How are email variations handled?
The tool normalizes email addresses by removing dots in Gmail addresses, lowercasing everything, and stripping plus-aliases. This catches duplicates like john.doe@gmail.com and johndoe@gmail.com as the same person.
Does cleaning affect automation histories?
The cleaning process operates on exported CSV data, not directly on ActiveCampaign. Automation histories remain intact in the platform. The reimported merged records update contact fields and tags without erasing existing automation logs.
Example: Input → Output
name
email
phone
city
status
Alice Johnson
alice@example.com
+1-555-0101
New York
active
alice johnson
ALICE@EXAMPLE.COM
5550101
new york
Active
Red rows show common data quality issues. dataclean.to normalizes and generates JSON-LD automatically.