UseCase Solution
Merge Duplicate Rows & Fill Missing Data
Keep the newest, highest, or most complete record without losing fields.
100% Local Processing
Up to 10M Rows
Instant Results
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The Problem
The same entity appears across multiple rows with partial data. Simple dedup deletes useful fields; manual merging is slow and error-prone.
Our Solution
Identify duplicates by key fields, merge and fill empty values, and keep the newest or most complete record.
Key Features
Features optimized for this use case
Merge and fill empty fields
Keep newest/oldest/max/min
Column priority retention
Aggregate sum/average/count
Export duplicate details for review
Local processing, zero upload
How It Works
Complete data cleaning in three simple steps
Upload Data
Import Excel/CSV files
Pick Merge Rules
Set keys and retention strategy
Preview & Export
Review merges and download
FAQ
Common questions about this use case
Choose newest/max/min, or merge fields into the most complete record.
You can preview results and export duplicate details before final export.
Yes. Use multiple keys and merge fields as needed.
Yes. Multi-file and multi-sheet imports are supported.
Processing happens locally in your browser with no upload.
Ready to Clean Your Data?
100% free. 100% local. Your data never leaves your browser.