Data workbench

Drop in CSV, JSON or SQLite files and ask questions with SQL. Join files, group, filter, chart and export. A real SQLite database runs in your browser, so your data is never uploaded.

This uses SQLite compiled to WebAssembly. Everything lives in memory in this tab, so very large files (hundreds of MB) may be slow or fail, and closing the tab discards the database unless you download it. Dates in CSV files stay as text, so use SQLite date functions like date(col).