Free, Private & Local-First

Private CSV SQL Playground: Fast Local Queries via DuckDB-Wasm

Run SQL queries on your CSV files locally. Analyze large datasets in your browser without setting up a database or uploading files to a server.

Overview

This private CSV SQL playground allows you to run fast local queries directly in your browser. Using the built-in DuckDB-Wasm engine, you can filter, sort, and aggregate large CSV datasets without installing a database or uploading your files to the cloud. It's a secure, browser-based SQL console designed for big data analysis.

How It Works

Step 1

Load your CSV dataset into our private, no-install SQL playground.

Step 2

Write SQL queries to filter, sort, and group your data instantly.

Step 3

Run fast local queries with our secure DuckDB-Wasm engine.

Step 4

Analyze the data in your browser and then export the results for free.

Frequently Asked Questions

Is it safe to process sensitive CSV files online?

Yes. Your CSV data is processed entirely within your browser. No data is ever sent to a cloud server, making it impossible for your information to be stored, sold, or leaked. It's as secure as opening a file in a local desktop application.

Can I run SQL SELECT statements on my files?

Yes. This is a full SQL playground, not just a simple filter. You can write and execute complex SELECT statements on your local files using DuckDB SQL syntax.

What technology powers this tool?

This local-first tool is powered by DuckDB-Wasm, a high-performance engine that runs natively in the browser via WebAssembly. This allows for complex SQL queries and data transformations at speeds comparable to native desktop software.

Can this tool handle semicolons or other CSV delimiters?

Yes. The engine automatically detects separators, quote characters, and escape sequences. Whether your CSV uses commas, tabs, or semicolons, the tool will parse the data correctly without manual configuration.

Can I save my filtered results back to my device?

Yes. Once you have filtered, queried, or converted your data, you can export the results as a clean file at no cost. This is an efficient way to prune massive datasets into manageable local files.

Can I use this converter without an Internet connection?

Yes. Once the page has loaded, the data engine runs entirely offline in your browser. Since no data is transmitted to a server, you can continue to analyze your CSV files even if you lose your Internet connection.

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Privacy Note: This tool is safe for sensitive data because your files never leave your computer.