A small suite of single-file web apps for inspecting and reshaping tabular data. Powered by DuckDB-WASM — your files are read locally and never uploaded anywhere.
Read CSV, Parquet, JSON, NDJSON or Excel, inspect the schema, fine-tune the parsing heuristic with a live preview, and export to a different format. Sample-first, so the first preview appears in ~100 ms even on multi-GB files.
Launch appStructural and statistical analysis of Parquet files. Reads metadata straight from the footer and profiles columns, row groups and compression — referencing files by byte range, so even several large files stay memory-friendly.
Launch app