Local SQL Analyzer
Analyze your CSV, JSON, and Parquet files directly in your browser. Privacy First — your data never leaves your device.
Data Source
Query Editor
Query Results
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Frequently Asked Questions
How can I run SQL queries on CSV files without uploading?
KNothing SQL Analyzer uses **DuckDB Wasm** to process files entirely **within your browser**. Your CSV, JSON, or Parquet files are never uploaded to any server, ensuring 100% data privacy.
Is this tool faster than Excel or Google Sheets?
Yes, for large datasets. DuckDB is an analytical database engine capable of querying **millions of rows** in seconds, far exceeding the performance limits of traditional spreadsheet software.
What file formats can I analyze?
We natively support **CSV, JSON, and Parquet** files. We also support **XLSX (Excel)** files by automatically converting them to CSV client-side before loading them into the database.
Can I save or export my query results?
Currently, results are displayed in a table. You can copy the data directly. We are working on adding direct CSV/JSON export buttons for query results in the next update.
Is this SQL tool free to use?
Yes, the Local SQL Analyzer is **completely free** and open to everyone. There are no hidden costs, subscriptions, or usage limits.