100% local — no upload, no setup

Open and query Excel XLSX files online with SQL

View and analyse .xlsx spreadsheets in your browser without Excel. SQL queries, 100% local.

Queryfiles.app reads Excel .xlsx files directly in your browser using DuckDB WebAssembly. No Microsoft Office installation needed. Drop your spreadsheet and immediately query it with SQL.

Everything you need, nothing you don't

Excel compatibility

Open .xlsx files created in Microsoft Excel, LibreOffice or Google Sheets. No Office installation required.

SQL on spreadsheet data

Query your Excel data with SQL, including aggregations, GROUP BY, filters and transformations that would require complex Excel formulas.

Private by design

Your spreadsheet stays on your device. Nothing is uploaded to any server.

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

What Excel formats does Queryfiles.app support?
Queryfiles.app supports .xlsx files, which is the current standard Excel format. Older .xls binary files are not currently supported.
Can I query data from multiple Excel sheets?
Queryfiles.app currently loads the first sheet of a multi-sheet workbook when you open a file.
Do I need Microsoft Excel installed?
No. Queryfiles.app opens Excel files directly in your browser using WebAssembly. No Office installation is needed.
Can I filter Excel data with SQL?
Yes. Once the file is open, you can run any SQL query on your spreadsheet data, including WHERE, GROUP BY, ORDER BY and aggregation functions.
Is my Excel file uploaded to a server?
No. All file reading and querying happen entirely in your browser. Your data never leaves your device.

Ready to explore your data?

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

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