Free DuckDB Viewer — Open and Browse DuckDB Databases Online

About the Free DuckDB Viewer

The FinancialDataTools.com DuckDB Viewer is a free, browser-based tool for opening, inspecting, querying, and exporting DuckDB database files. It runs entirely in your browser using DuckDB-Wasm — no file is ever uploaded to any server.

Supported File Formats

Open any DuckDB database file (.duckdb, .db). DuckDB-Wasm provides full query support including all standard DuckDB SQL syntax: CTEs, window functions, PIVOT, JSON operations, list operations, ASOF JOIN, and temporal queries.

Key Features

Browse tables and rows in a spreadsheet-style grid. Sort any column ascending or descending. Filter rows by column values or custom conditions. Run any DuckDB SQL query using the built-in SQL panel. Inspect table schema including column types. Export data to CSV, JSON, TSV, or Excel (.xlsx) — including multi-table workbook export.

Privacy and Security

All database processing happens inside your browser using DuckDB-Wasm. No file content is transmitted to any server. Closing the browser tab clears all data immediately.

How to Use the DuckDB Viewer

Click the Open button or drag and drop your .duckdb file. Tables appear as tabs. Click SQL to open the query panel and run any DuckDB SQL. Click Export to download your data.

Use Cases for Financial Data

Analyze large financial datasets stored in DuckDB. Run analytical SQL against trading data or market history. Inspect DuckDB exports from Python or R data pipelines. Export DuckDB tables to Excel for reporting.

Frequently Asked Questions

Is the DuckDB Viewer really free?

Yes, completely free with no signup required.

Does my DuckDB file get uploaded to a server?

No. DuckDB-Wasm runs entirely in your browser.

Can I run SQL queries?

Yes. Full DuckDB SQL including CTEs, window functions, PIVOT, and JSON operations.

Does the viewer support analytical queries?

Yes. DuckDB-Wasm provides complete analytical SQL support in the browser.