Duplicate Contact Finder
Spot duplicate contact rows before importing data.
Catch duplicate contacts before import
Importing a contact list with duplicates pollutes your CRM and leads to double-emailing the same person. This finder scans pasted rows and flags likely duplicates so you can clean the list before it reaches your system.
Catching duplicates upfront is far cheaper than merging records later, and reviewing them in one place makes the cleanup quick. Paste your contacts, review the flagged repeats, and export a deduplicated list ready to import.
Catching duplicates
It groups rows that share a key such as email, so you can merge before importing and avoid double-emailing. Your list is scanned in the browser and never uploaded.
Frequently asked questions
How are duplicates detected?
Each row is lowercased, stripped of most punctuation, and has repeated spaces collapsed. Rows that become identical are merged, so the output is the deduplicated list.
Will it catch "Jon Smith" and "John Smith"?
No. Only rows that match exactly after cleanup are merged. Near-duplicates with typos, nicknames, or different emails still need a manual review.
What should each line contain?
One contact per line, such as "Jane Doe, jane@acme.com, Acme". Keep the same field order on every line so identical contacts produce identical text.
Related tools
Free private browser tools for practical work.