CSV & JSON SQL Query Tool
Run standard SQL queries directly on your CSV and JSON files in the browser. 100% private, zero server uploads, powered by DuckDB WebAssembly.
Select your file here to get started
or drop your file here.
What to expect
Experience fast, secure, and completely private processing directly inside your web browser.
100% Private & Local Processing
Your CSV and JSON data never leaves your browser. Powered by DuckDB WebAssembly for secure, client-side data analysis.
Lightning-Fast CSV/JSON Queries
Execute complex SQL queries on 100MB+ files in milliseconds. Columnar storage and query optimization built right in.
Full Standard SQL Support
Use SELECT, WHERE, JOIN, GROUP BY, ORDER BY, and aggregations (COUNT, SUM, AVG) just like a real database.
How it works
Simply upload your content, adjust your settings, and download the result instantly.
1. Upload CSV or JSON Files
Drag and drop your .csv or .json files (up to 200MB). All processing happens securely in your browser.
2. Write SQL Queries
Use standard SQL syntax with intelligent autocomplete to filter, join, aggregate, and transform your tabular data.
3. Export Filtered Results
Download your queried data instantly as a new CSV or JSON file. Only export exactly what you need.
Frequently Asked Questions
Get quick answers about supported formats, data privacy, and using this tool.
About This Tool
Need to analyze, filter, or join large **CSV or JSON files** but don't want to upload sensitive data to the cloud? Our **In-Browser CSV & JSON SQL Engine** lets you run full SQL queries on your data entirely locally. **No uploads. No installations. No privacy concerns.** Just drag your CSV or JSON files, write standard SQL (SELECT, JOIN, GROUP BY), and get instant results. Perfect for data analysts, developers, and anyone working with sensitive datasets who needs a powerful, local SQL database for their files. Supports files up to 200MB with lightning-fast, columnar query performance.
