UseCase Solution
Merge Duplicate Rows & Fill Missing Data
Keep a record by an explicit rule or fill empty fields from duplicates.
100% Local Processing
Large File Ready
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, or keep a row by a selected retention rule.
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
Review duplicate rows in the result view
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, oldest, max, min, priority, or an explicit merge-and-fill strategy.
You can inspect a sample preview and review duplicate rows after processing. Only cleaned results are exported.
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.