FREE · DEVELOPER TOOLS

Parquet Viewer & Converter.

Open Apache Parquet files in your browser: see the schema, row groups and compression, page through rows, query them with SQL and export to CSV or JSON.

Drop a Parquet file here or

Snappy, Gzip, Brotli, Zstd and LZ4 compression · up to 300 MB · read on your device, nothing is uploaded

How to use Parquet Viewer & Converter

Drop a .parquet file. Read the schema and statistics, move through the rows page by page, press Query with SQL to analyse them, or export CSV or JSON.

How it works

Parquet is read with hyparquet (MIT) and its decompressors in your browser; rows are loaded into SQLite (sql.js) only when you choose to query them.

Example

The schema lists each column with its type and whether it can be empty; rows appear 100 per page, and Export CSV writes up to 500,000 rows with a header line.

Open a Parquet file

Drop a .parquet file on the page.
Read the summary: number of rows, columns, row groups and the compression used; open Schema to see each column’s type.
Move through the rows 100 at a time with Next → and ← Previous.
Press Export CSV or Export JSON to convert the file, or Query with SQL to analyse it.

Parquet files compressed with Snappy, Gzip, Brotli, Zstd or LZ4 are supported. Nested columns are shown as JSON text, and integers too large for JavaScript numbers are kept as text so they stay exact.

Convert and query

Export and SQL use the first 500,000 rows at most. Query with SQL loads those rows into an in-memory SQLite table named after the file, so you can filter, group and sort them with the same editor as the SQL Query on CSV & JSON Files tool.

Files up to 300 MB can be opened. To inspect the CSV you exported, open it in the CSV Viewer & Editor.

Questions about Parquet Viewer & Converter

Is my Parquet file uploaded?

No. It is read with hyparquet in your browser; nothing is sent to a server.

How do I convert Parquet to CSV?

Open the file and press Export CSV. The CSV has a header line and up to 500,000 rows.

Why are some numbers shown as text?

Parquet INT64 values larger than 9,007,199,254,740,991 cannot be stored exactly as JavaScript numbers, so they are kept as text.

Is Parquet Viewer & Converter free, and do I need an account?

Yes. This tool is free to use in your browser without an account. Processing takes place on your device.

What are the limits and what should I check?

Files up to 300 MB; export and SQL use the first 500,000 rows. Snappy, Gzip, Brotli, Zstd and LZ4 compression are supported. Nested columns are shown as JSON text. Review the result before using it in your work.

Is my input sent to a server?

Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.