# Free Secure Excel Converter — Ask Jeeves

> Free, secure Excel converter. Convert XLSX to CSV or JSON in your browser—files never leave your device.

## Tool

- [Free Secure Excel Converter](https://xlsx.askjeeves.cc/): Convert XLSX to CSV or JSON in your browser

## Supported conversions

- XLSX → CSV
- XLSX → JSON

## FAQ

- Is this Excel converter free? Yes. Every conversion is free with no account, watermark, or usage limit.
- Is this Excel converter secure? Yes. Files are processed locally in your browser. Nothing is uploaded to a server, so your spreadsheets stay on your device.
- What formats can I convert XLSX to? You can convert XLSX (Excel) files to CSV or JSON. Both options support an optional sheet name; if omitted, the first worksheet is used.
- Can I choose which worksheet to convert? Yes. Enter a sheet name in the options before converting. If you leave it blank, the converter uses the first sheet in the workbook.
- Does the converter work on mobile? Yes. It runs in modern mobile browsers that support HTML5 and JavaScript. Very large files may be slower on mobile devices.
- What is the maximum file size? Each file can be up to about 50 MB. If a file is too large, you will see a clear error message asking you to use a smaller file.
- Why did my conversion fail? Common causes are a non-XLSX file, corrupted workbook data, or exceeding the size limit. Check the message below the converter for specific guidance, then try again or refresh the page.

## Extended context

- [Full site context](https://xlsx.askjeeves.cc/llms-full.txt): how-it-works, security, and per-conversion details

## More tools

- [Ask Jeeves](https://askjeeves.cc): Free file conversion tools (PDF, images, CSV/JSON/Excel, Word)

## How it works

1. Upload an XLSX file using the drop zone or file picker.
2. Choose CSV or JSON as the output format. Optionally specify a sheet name.
3. Click Convert, then download your result. Nothing is uploaded to a server.

## Secure and private

Your spreadsheets are processed locally in your browser. Nothing is stored on a server and nothing is uploaded over the network. That makes this tool a good fit for financial data, HR exports, and other sensitive workbooks you do not want to send to a third-party service.

## Conversion details

- **XLSX → CSV** — Convert Excel (XLSX) to CSV with optional sheet selection. Defaults to the first worksheet.
- **XLSX → JSON** — Convert Excel (XLSX) to JSON with optional sheet selection. Rows become objects keyed by column headers.

## Keywords

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- Site name: Free Secure Excel Converter — Ask Jeeves
- Sitemap: https://xlsx.askjeeves.cc/sitemap-index.xml
- Organization: [Ask Jeeves](https://askjeeves.cc)