How to dedupe a customer csv by email
- Step 1Export customer data — Download the customer list from your shop, CRM, or billing system as CSV.
- Step 2Upload locally in the browser — Drop the file into the tool. CSV contents are not sent to JAD Apps servers.
- Step 3Pick Email or Customer ID — Select the column that should be unique for each customer.
- Step 4Export the clean list — Download the deduped CSV and import it into your CRM or store.
Frequently asked questions
Does it merge conflicting customer details?+
No. It keeps the first row for each key and removes later duplicate rows.
Can I dedupe by Customer ID instead of email?+
Yes. Any column can be selected as the unique key.
Is customer data stored?+
No. Only usage metadata is recorded when you are signed in.
Privacy first
Processing runs locally in your browser with PapaParse. No file is uploaded — only metadata counters are saved for signed-in dashboard stats.