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Work · August 23, 2026

BigCSV

Open the CSV that crashes Excel. Instantly.

Visit bigcsv.app ↗Alternatives

What it does

Numbers crashed on my 3.2 GB university export, so I built BigCSV. It memory-maps the file instead of reading it into RAM, so a multi-gigabyte CSV is on screen about as fast as you can double-click it. Scroll, search and sort every row without a terminal. Free with no row limits and no nag screens. Filter, column stats and export to Excel unlock once for €9.99 (about $10.80). One-time purchase, never a subscription. Nothing leaves your Mac.

BigCSV is a native macOS app that opens multi-gigabyte CSV & TSV files instantly: the large CSV files that crash Excel and Numbers. Search, sort & filter without a terminal.

The files that freeze Excel and spin Numbers forever open in well under a second on your Mac. Then scroll, search and sort every row. No terminal, no cloud, no waiting. Numbers just spins. Your export has fifty million rows. Double-click it and you'll wait, then watch it truncate, freeze, or quit outright. The file was never the problem. The tool was. Viewing a giant file is just the start. Search every row, sort any column, and trust that what you see is parsed correctly, all at fifty-million-row scale, all on your Mac. BigCSV memory-maps the file instead of loading it, so a 4 GB export is on screen the moment you double-click, not minutes later. It never reads the whole file into RAM.…from bigcsv.app

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