Merge Multiple Excel Files & Remove Duplicates

Combine 5+ Excel files, align columns automatically, and deduplicate across all files in one click.

100% Local Processing

Up to 10M Rows

Instant Results

The Problem

You have customer lists from different sources - marketing, sales, events. Excel can only deduplicate within a single file. Manually combining files means copy-pasting, aligning columns, and missing duplicates across files.

Our Solution

Upload all your files at once. We automatically detect column headers, align data across different structures, and remove duplicates across the entire merged dataset. Keep the newest record, the one with the highest value, or merge data from duplicates.

Key Features

Features optimized for this use case

Multi-file upload

Auto column alignment

Cross-file deduplication

Smart merge strategies

Keep newest/oldest/max/min

Export merged results

How It Works

Complete data cleaning in three simple steps

Upload Files

Drag all your Excel/CSV files

Configure Rules

Select columns and strategy

Download Result

Get one clean, merged file

FAQ

Common questions about this use case

Yes! We automatically align columns by name. Missing columns are filled with empty values.

No limit. Upload as many files as you need.

You can configure column mapping or rename headers before processing.

Ready to Clean Your Data?

100% free. 100% local. Your data never leaves your browser.