Excel to JSON Converter

Transform your Excel spreadsheets into structured JSON data for APIs and applications.

100% Browser-Based

Files Never Leave Your Device

No Server Uploads

Zero Data Collection

How It Works

Upload your Excel file (XLSX or XLS)

Headers are automatically detected as JSON keys

Click "Convert to JSON" to transform the data

Download or copy the JSON output

Automatic header detection for JSON keys

Preserves data types (numbers, dates, text)

Clean JSON array of objects output

Handles large spreadsheets efficiently

Perfect for API data preparation

How are Excel dates handled?

Excel dates are converted to ISO 8601 format strings in the JSON output.

Can I convert a specific sheet?

Currently the first sheet is converted. Multi-sheet support with separate JSON objects per sheet is planned.