CSV → Parquet
Turn CSV exports into columnar Parquet without shipping them to a random web converter. DataEngUtils parses your CSV locally with an Apache Arrow engine compiled to WebAssembly, auto-detects the delimiter, lets you skip preamble rows, and writes a compressed Parquet file you can download. It is built for recurring pipeline tasks: drop a multi-hundred-megabyte export, confirm inferred types, and produce Parquet that downstream systems accept. Because everything runs in your browser, you can convert customer files, finance extracts and ad-hoc dumps that should never transit a third-party server.
Open it in the app
CSV → Parquet runs in the DataEngUtils browser app on a Rust engine (Apache Arrow) compiled to WebAssembly — part of the Pro workbench, entirely client-side, and nothing is uploaded.
How it works
1. Open CSV → Parquet
Open the tool in the DataEngUtils app. No upload, no account.
2. Drop one or more CSV files
Add CSV or TSV files. Delimiters and preamble rows are detected automatically, and you can override them.
3. Choose compression and download
Pick Snappy, Zstd or Gzip, preview the schema, then download the .parquet output.
Why not use an online tool?
Online converters tools require uploading your Parquet and CSV files to a third-party server. For production work, that is a security and compliance risk. DataEngUtils runs a client-side engine in your browser — same convenience, none of the exposure.