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CSV Merger

Combine multiple CSV files into one. Stack rows or add columns side-by-side.

How it works: Upload 2+ CSV files → choose merge mode (Vertical to stack rows, Horizontal to add columns) → download merged file. Privacy first: Everything happens in your browser — your data never leaves your device.
Benchmark Performance
Real-world tested, production-ready
223K rows/sec
15M+ rows
Multiple files
View full benchmark →
100% Client-Side•Your data never leaves your browser
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