100% FREE & OPEN SOURCE

Dat.

The fastest data file viewer around.

Open Parquet and CSV files of any size in less than a second. Open source and private: your files never leave your computer.

Download for macOS
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See it work

Open a file to start

Drop a file here, or open one from disk.

CSVTSVParquetJSON
0 rows0 cols—
Pick two multi-gigabyte files, open both in less than a second.

Open 1 GB files in a second.

Pick two multi-gigabyte CSV and Parquet files from disk. Both open as tabs in the same window, ready in less than a second.

Build pivots by dragging columns.

Group sales by region, then by category, and sum the revenue. Expand only the branches you want to read.

Typed filters over the grid.

Add typed filter chips over the grid. Combine conditions while keeping active filters and results in view.

Find it, even with a typo.

Search one column or all of them. Fuzzy matching still finds the word when the query is misspelled.

Join two files in SQL.

Every view is a DuckDB query you can edit. Join two open files, run it, and keep working from the result.

PARQUET · CSV · XLSX · TSV · JSON · SQLITE · DUCKDB

See how fast your files open.

Download for macOS

FREE AND OPEN SOURCE