Excel to JSON Converter - XLSX/XLS to JSON Online

Convert Excel spreadsheets (XLSX, XLS) to JSON format instantly. Select sheets, customize output format, preview data. No uploads, works offline.

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Options

Output Format

First row as headers

Pretty print (formatted)

Convert dates to ISO format

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Security: Only process files from sources you trust. All processing happens locally in your browser.

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Frequently Asked Questions

Both modern XLSX (Excel 2007+) and legacy XLS (Excel 97-2003) formats are fully supported. The converter reads both binary and XML-based Excel files.

By default, each row becomes a JSON object with column headers as keys. You can also choose array format where each row is an array, or compact format that removes null values.

Yes! Select which sheet to convert from the dropdown. You can also download all sheets at once, each as a separate JSON file in a ZIP archive.

Numbers remain as numbers, dates are converted to ISO 8601 strings, booleans stay as true/false, and formulas are evaluated to their result values. Empty cells can be exported as null or omitted entirely.

No. If your Excel file doesn't have headers, disable this option and the converter will auto-generate column names (A, B, C, etc.) or use numeric indices depending on the output format.

Yes. The converter processes files entirely in browser memory. Files up to several MB with thousands of rows work well on modern computers. Very large files may take a few seconds to process.

Absolutely. All conversion happens in your browser using the SheetJS library. Your Excel files never leave your device and are not uploaded to any server.

Formulas are automatically evaluated and exported as their calculated values. Cell formatting (colors, fonts, borders) is not preserved in JSON, only the data values themselves.

Yes! Export Excel data as JSON for REST APIs, NoSQL databases like MongoDB, or JavaScript applications. The compact format option creates clean JSON without null values.

Merged cells are exported with the value in the top-left cell. For complex multi-header tables, you may need to clean the data in Excel first or post-process the JSON output.

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