Parquet Viewer — Open & Query .parquet Files Online

Apache Parquet is a columnar storage file format designed for analytics. It stores data by column with per-column compression and metadata, which makes scans and aggregations fast and files small.

No. The file is opened locally with DuckDB-Wasm in your browser. Nothing is uploaded, which makes it safe for sensitive or proprietary data.

Yes. Run a query in the Query tab and use Export CSV or Export JSON to download the result. You can select or transform columns first.

Parquet is the focus, but the viewer also opens CSV, TSV, JSON/NDJSON and Arrow files, since DuckDB can read all of them.

It works well for files up to a few hundred MB, depending on your device memory. DuckDB-Wasm is single-threaded and bounded by browser memory, so very large files are better handled by native DuckDB.