or click to browse
Drag and drop any CSV file onto the page, or click to browse. Your file stays in your browser — nothing is uploaded.
The CSV is parsed and converted to Parquet with automatic type detection and Snappy compression. Preview the data to verify it looks correct.
Click the download button to save your Parquet file. Column types are inferred automatically, and the file is compressed with Snappy for optimal size.
Your files never leave your browser. All conversion happens locally using WebAssembly — no uploads, no servers, no tracking.
Powered by a browser-based WebAssembly engine. Convert files with millions of rows in seconds, right in your browser.
Convert files up to several hundred megabytes. No artificial row limits or file size restrictions.
No sign-up, no credit card, no hidden limits. Use this converter as much as you need, completely free.
Parquet files are smaller, faster to query, and preserve data types — making them ideal for data pipelines and analytics. Data engineers use this converter to turn CSV exports into Parquet before loading into Snowflake, BigQuery, or Databricks. Analysts use it to compress large CSVs for archival or sharing. Developers use it to create test fixtures in Parquet format without writing Python. The output uses Snappy compression by default for a good balance of file size and compatibility.
Yes, completely free with no limits. No sign-up or credit card required.
No. This tool runs entirely in your browser using WebAssembly. No Python, Java, Spark, or any other software needed.
Your data never leaves your browser. All conversion happens locally using a WebAssembly engine. We never see, store, or transmit your files.
The WebAssembly engine automatically detects column types from your CSV data — integers, floats, dates, booleans, and strings are all recognized. You can preview the detected types before downloading.
The output uses Snappy compression by default, which provides a good balance of file size and read speed. Snappy is supported by all major data tools.
It depends on the data, but Parquet files are typically 2-10x smaller than the equivalent CSV due to columnar compression and efficient encoding.
Yes. The converter automatically detects the delimiter used in your file, including commas, tabs, semicolons, and pipes.
Yes. Use our free Parquet to CSV converter to convert Parquet files back to CSV format.
Convert Parquet files to CSV instantly in your browser. No upload, no Python, no install. Privacy-first — your data never leaves your device.
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Convert Excel files (.xlsx, .xls) to Apache Parquet instantly in your browser. No upload, no Python, no install. Smaller files, typed columns, Snappy compression.
View Parquet files online without Python. Inspect schema, browse data, check row group metadata. 100% free, no row limits.