How to dedupe an event registration csv
- Step 1Export your registration list — Download attendee data from Eventbrite, Hopin, Ticket Tailor, or your event form as CSV.
- Step 2Drop the list into Deduplicator — The CSV is parsed locally in your browser.
- Step 3Choose Email or Ticket ID as the unique key — Select the column that uniquely identifies one registration.
- Step 4Download and use the clean list — Export the deduped registration list for mail-merge, badge printing, or your check-in app.
Frequently asked questions
What if an attendee registered with two different emails?+
Those are two different values in the Email column, so they are kept as separate rows. Manual review is needed for that case.
Can I keep the last registration rather than the first?+
The current tool keeps the first occurrence. To keep the latest, sort by registration date descending using the CSV Sorter first, then dedupe.
Is attendee data stored by JAD Apps?+
No. Only usage metadata is saved when you are signed in. Attendee names and emails are never uploaded.
Privacy first
Processing runs locally in your browser with PapaParse. No file is uploaded — only metadata counters are saved for signed-in dashboard stats.