100% local — no upload, no setup

Open Parquet files online for free – drag and drop, no setup

The fastest way to inspect a .parquet file: drag it into your browser and you're done. No Python, no Spark, no installation.

Whether you received a Parquet file from a data pipeline or downloaded one from a public dataset, Queryfiles.app lets you open and query it in seconds. Just drag the file onto the page – no installation, no account, no upload.

Everything you need, nothing you don't

Zero setup, instant results

Open a Parquet file in seconds by dragging it into your browser. No installation, no Python, no configuration.

Works in any browser

Queryfiles.app runs on any modern browser on Windows, macOS and Linux. No native binary required.

Your data stays local

Nothing is sent to any server. The file is read and processed entirely inside your browser.

How it works

  1. 1

    Open a file

    Drag and drop a Parquet, CSV, JSON or XLSX file onto the home page, or click Browse to select it from your computer.

  2. 2

    Schema detected instantly

    Queryfiles.app reads the file locally and automatically infers column names, data types and an initial SQL query.

  3. 3

    Query with SQL

    Edit the SQL in the built-in editor powered by DuckDB, run queries and explore your data in real time, all inside your browser.

Frequently asked questions

How do I open a Parquet file online?
Go to Queryfiles.app, drag your .parquet file onto the drop zone, or click Browse to select it. The file opens instantly in your browser.
Is there a free Parquet reader available online?
Yes. Queryfiles.app is free and open source. You can open and query Parquet files at no cost, with no account or login required.
What are the alternatives for opening Parquet files?
Common alternatives include Python with pandas and pyarrow, Apache Spark, the DuckDB CLI, or tools like DBeaver. Queryfiles.app offers the fastest path when you just need to inspect a file quickly without any setup.
How long does it take to open a Parquet file?
Typically a few seconds for files under 100 MB. Larger files may take longer depending on available browser memory.
Can I open a Parquet file without installing anything?
Yes. Queryfiles.app runs entirely in your browser using WebAssembly. There is nothing to download or install.

Ready to explore your data?

Drop a file and start querying in seconds. No account, no upload, no setup.

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