Remove Duplicates in Excel and CSV: 3 Fast Methods (Plus Instant AI Cleanup)
Remove duplicates in Excel using Data > Remove Duplicates or the =UNIQUE(A2:D500) formula. For fuzzy duplicates (e.g. typos in company names), use Olonyn's AI cleaner to auto-merge variations in 1 click.
Method 1: Excel Built-in Remove Duplicates Tool
Highlight your data range > Go to Data Tab > Click "Remove Duplicates" > Select key columns (e.g., Email or Phone). Note: This only catches 100% exact character matches.
Method 2: Dynamic Excel Array Formula
In a blank sheet or cell, type: =UNIQUE(FILTER(A2:D1000, A2:A1000<>"")). This creates a live, de-duplicated mirror of your source list.
Method 3: 1-Click AI Fuzzy Deduplication
Excel cannot tell that "Apple Inc" and "Apple Computers" are the same company. Olonyn analyzes semantic company entities, merges phone and contact columns, and yields a sanitized master row.
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