DuckDB · in your browser · nothing uploaded

Query any file
like a database.

Drop a CSV, Parquet or JSON file — even a few gigabytes — and run real SQL over it. Profile every column, chart the result, export what you need. The file never leaves this tab.

• Real SQL. The full DuckDB engine — joins, window functions, aggregates.
• Instant profile. Types, ranges, nulls and cardinality the moment it loads.
• Truly private. No server sees your data — the network tab stays empty.