Data Workbench · open large CSV without Excel
Open a large CSV without Excel freezing
Use a browser-local data workbench to inspect schema, preview rows, and run targeted queries instead of loading everything into a spreadsheet grid.
Workflow
- Drag a CSV into Local Data Workbench.
- Review inferred columns, types, nulls, and top values.
- Run SELECT COUNT(*) and SELECT * LIMIT 100 before deeper analysis.
- Export only the rows or columns you actually need.
Important notes
- Production large-file support should use DuckDB-Wasm and streaming where possible.
- Avoid pushing full datasets into main-thread JavaScript arrays.