100% Client-Side & Private • Zero Server Uploads

Columnar Storage

Convert CSV to Parquet Online - Compressed Apache Parquet

Convert CSV spreadsheets into compressed, columnar Apache Parquet files directly in your browser with DuckDB-Wasm.

CSV.csv

Parquet.parquet

Drop your CSV file here or browse

Drag and drop from your computer, browse, or pasteCtrl / ⌘ + V

Accepted:.csv

Processed locally in browser - never uploaded to any server

Max 10MB for free in-browser conversion

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Step-by-Step Guide

How to Convert CSV to Parquet Online in 3 Simple Steps

Convert your data effortlessly with zero installations and complete local privacy.

1Step 1:
Upload CSV Spreadsheet
Drop your CSV or TSV file into the upload zone.
2Step 2:
Automatic Schema Inference
DuckDB scans column types (integers, floats, dates, text) automatically.
3Step 3:
Download Parquet File
Download a compact, Snappy-compressed .parquet file with up to 80% size reduction.

Help & Documentation

Frequently Asked Questions About CSV to PARQUET Conversion

Everything you need to know about formats, privacy, and browser-based file conversion.

What are the advantages of converting CSV to Parquet?

Parquet uses columnar compression, making files up to 80% smaller and querying up to 100x faster in tools like DuckDB, PySpark, and AWS Athena.

Does the converter infer column data types?

Yes. DuckDB analyzes the first several thousand rows to automatically detect integers, decimals, booleans, dates, and strings.

Can I query the resulting Parquet file with pandas or Polars?

Yes. The output is 100% compliant with the official Apache Parquet format specification.

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