Free browser-based data explorer built on DuckDB WASM. Open CSV, Excel, JSON, Parquet and 10+ more formats up to 1GB, then filter, join, pivot, run SQL, chart, and export. Everything runs on your machine, nothing is uploaded, and it works offline once loaded. AI transforms use your own API key or a local model. Plus 300+ one-page tools: converters, chart makers, sample datasets.