What SQL dialect is supported?

DuckDB SQL — a superset of standard SQL with window functions, CTEs, JSON functions, and more.

Can I join multiple CSV files?

Yes. Each uploaded file becomes a table named after the filename.

No. DuckDB-WASM runs entirely in your browser — your data never leaves your device.

Free plan supports up to 100,000 rows. Pro plan has no limit.

Yes — COUNT, SUM, AVG, MIN, MAX, and all standard aggregates are supported.

Run SQL queries directly on your CSV files using DuckDB-WASM. No server, no upload. Securely process files in your browser me

Your files never leave your device. Processed locally. 100% private.

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Complete your task perfectly in just three straightforward steps.

Upload one or more CSV files — each becomes a queryable table.

Write standard SQL: SELECT, JOIN, GROUP BY, WHERE, ORDER BY — all supported.

Download the query result as a new CSV file.

Everything you need to know about the SQL on CSV.

Continue working with our suite of free data utilities.

Visual data exploration with charts, pivot tables, and column statistics. Processed entirely in your browser for 100% data pr

Generate a full data quality report for a CSV: types, nulls, distributions, outliers. Fast, private, and secure browser-based

Chain multiple data transformations in sequence. Save and rerun pipelines on new data. Securely process files in your browser