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Browse all 27 privacy-first CSV and Excel tools. Process files entirely in your browser — no uploads. Files never leave your browser.
Split Large CSV Files
Upload one or multiple CSV files and split them into smaller chunks. Powered by Web Workers — tested to 102M rows and 10 GB inputs.
How it works: Upload CSV file → choose split mode (by rows, size, or parts) → configure settings → download split files. Privacy first: Everything happens in your browser — your data never leaves your device.
Benchmark Performance
Real-world tested, production-ready
~260K rows/sec
102M rows
View full benchmark →