Excel (XLSX) to JSON Converter
Handles Up to 1 Million Rows

Convert Excel XLSX files to JSON format instantly in your browser. Dates are preserved as ISO 8601, numbers stay accurate.

Drag & drop your file here, or browse

Accepts: .xlsx (up to 50 MB)

Your data stays in your browser. By using this tool, you agree to our Terms and Privacy Policy.

How to Convert Excel (XLSX) to JSON

Drag and drop your XLSX file onto the drop zone at the top of the page, or click to browse and select a file.

Conversion starts automatically. Dates, numbers, and booleans are detected and preserved in the JSON output.

Click the "Download JSON" button to save the converted result.

Key Features of This XLSX to JSON Converter

100% Local Processing: Your files are never uploaded to a server. All conversion happens in your browser, so your sensitive data stays private.
Smart Date Detection: Excel date cells are automatically detected and converted to ISO 8601 format (YYYY-MM-DD). Built-in and custom date formats are recognized.
Free with No Limits: No row limits, no file count restrictions, and no account required. Start converting right away.

Excel (XLSX) vs JSON: When to Use Each Format

Excel (XLSX) stores data in a rich binary format with formatting, formulas, and multiple sheets. JSON is a lightweight text format ideal for APIs, web apps, and data exchange.

	Excel (XLSX)	JSON
Structure	Multiple sheets, rich formatting	Nested objects and arrays
Data types	Numbers, dates, booleans, text	Numbers, strings, booleans, null
Compatibility	Excel, Google Sheets, LibreOffice	APIs, JavaScript, databases
File size	Compact (ZIP-compressed XML)	Larger (key names repeated per row)
Human readable	Requires Excel or compatible app	Plain text, easy to read

Benefits of Converting XLSX to JSON

API Integration — JSON is the standard format for REST APIs and web services, making it easy to feed Excel data into applications
Developer Friendly — JSON is natively supported by JavaScript, Python, and virtually every modern programming language
Flexible Structure — JSON supports nested objects and arrays, enabling richer data representations than flat spreadsheets

Frequently Asked Questions

Is my data safe during conversion?

Yes. All processing happens entirely in your browser using WebAssembly. Your files are never uploaded to any server.

Can I convert Excel files to JSON?

Yes. This tool uses an efficient SAX parser to extract data from XLSX files and converts it to a JSON array of objects.

Are dates preserved in the JSON output?

Yes. Excel date cells are detected and converted to ISO 8601 format (YYYY-MM-DD or YYYY-MM-DD HH:MM:SS) in the JSON output.

Which sheet is converted?

The first sheet in the workbook is converted. Multi-sheet conversion is not currently supported.

What is the file size limit?

The input limit is 50MB. Since XLSX files are ZIP-compressed and JSON output includes column names for every row, the output can be significantly larger than the input.

What JSON format is the output?

The output is an array of objects, where each object represents a row and keys are the column headers from your Excel file.