How to find duplicate employee records in an hr csv
- Step 1Export the employee CSV — Download from your HRIS, payroll system, or HR spreadsheet.
- Step 2Drop into CSV Duplicate Finder — Select Employee ID or National Insurance Number as the key column.
- Step 3Review flagged duplicates — Each duplicate set is marked. Compare records to identify the canonical version.
- Step 4Resolve in your HR system — Merge or deactivate duplicate records before migration or next payroll run.
Frequently asked questions
Is this safe to use with employee personal data?+
Yes. All processing is in your browser. No employee data is uploaded or transmitted.
Can I check for duplicates on email and Employee ID separately?+
Yes. Run the finder twice with different key columns to cover both.
What if duplicates exist because an employee was rehired?+
All instances are flagged. Rehire duplicates can be identified by comparing start dates in the review step.
Privacy first
Processing runs locally in your browser with PapaParse. No file is uploaded — only metadata counters are saved for signed-in dashboard stats.