Convert CSV to Parquet
Select your CSV and get it in Parquet format in a few clicks. No server-side processing, everything happens in your browser.
Quick Start
- 1Upload your CSV file
Drag-and-drop a CSV file or click to browse. Everything stays in your browser.
- 2Select a delimiter
Choose the delimiter used in your CSV — comma, tab, semicolon, or pipe.
- 3Convert to Parquet
Click convert and your CSV is transformed to Parquet format using WebAssembly.
- 4Download the Parquet file
Download the resulting Parquet file directly from your browser.
Specs
- Input
- .csv
- Output
- .parquet
- Delimiters
- , \t ; |
- Engine
- DuckDB WASM
Data stays on your device
All processing runs locally in your browser. Nothing is sent to any server.
Our CSV to Parquet converter uses WebAssembly to convert your CSV files directly in the browser. This ensures that your data never leaves your device, guaranteeing privacy and security. Parquet is a columnar storage file format optimized for analytics — highly efficient in both storage and performance while supporting all modern data processing tools.
0 bytes
Data transmitted
4
Delimiters supported
Automatic
Compression
100% Free
Our online CSV to Parquet converter is completely free to use, with no hidden costs or subscriptions.
Privacy-Focused
Your data never leaves your device. All processing happens locally in your browser using WebAssembly.
Fast and Efficient
Quickly convert even large CSV files to optimized Parquet format with our WebAssembly engine.
No Installation Required
Use our converter directly in your web browser, no software installation needed.
Is this CSV to Parquet converter private?
Yes. The converter runs entirely in your browser using WebAssembly. Your data never leaves your device.
What delimiters are supported?
We support comma, tab, semicolon, and pipe delimiters. Select the appropriate one before converting.
What is the advantage of Parquet over CSV?
Parquet is a columnar storage format optimized for analytics. It offers better compression, faster query performance, and supports complex nested data structures.
Can I use this tool offline?
Yes. Once the page finishes loading, you can disconnect from the internet and continue converting files offline.
Advantages of Parquet Format
Parquet is a columnar storage file format optimized for analytics. It's highly efficient in both storage and performance while supporting all modern data processing tools. Here are some key benefits:
How it works
Our tool uses WebAssembly to convert your CSV to Parquet directly in the browser. This ensures that your data never leaves your device, guaranteeing privacy and security. The process is as follows:
Parquet Structure
Understanding the structure of Parquet files can help appreciate its efficiency. A Parquet file is organized into rows and columns, but the data is stored in columns, allowing for the following structure:
- Column Chunks: Each column is divided into chunks, which are then stored in separate pages. This structure facilitates efficient data compression and encoding.
- Page Types: There are three types of pages - data pages, dictionary pages, and index pages, each serving a specific purpose in data storage and retrieval.
- Row Groups: A set of column chunks that roughly correspond to a block of rows, allowing for more efficient reads of specific rows.
- Metadata: Contains information about the file's schema, version, and other attributes necessary for processing the file.