File & internet
XLSX to JSON
Convert the first worksheet in an Excel workbook into JSON locally. Nothing you enter leaves your browser.
The selected file is processed only in this browser. No upload is made.
Your result will appear here.
What this tool does
About the XLSX to JSON
This converter reads XLSX input and rewrites the same usable information as JSON. It changes the representation, not the meaning of the source data, except where the target format cannot express the same structure.
It is designed for quick file and network calculations without sending the selected file to an application server.
How to use it
- Choose the source file in the workbench.
- Review any output settings shown beside the file control. Then select “Convert to JSON.”
- Inspect the result and download the new file. Keep the original until you have verified the converted copy.
Practical example
Start with a known input
Try this sample input: Use the pre-filled sample values in the workbench. Select “Convert to JSON” and compare the result with the source before using it elsewhere.
What to know about the result
- JSON preserves nested objects, arrays, numbers, booleans, and null values, but it requires quoted property names and does not allow comments.
- XLSX is a workbook format. These tools operate on the first worksheet and use the first row as column names where a table structure is required.
- Processing happens in this browser. Your entered text and selected files are not sent to FormatCalc for conversion.
Common questions
Using the XLSX to JSON
Is the XLSX to JSON free to use?
Yes. FormatCalc's XLSX to JSON is free to use with no account required.
Is my data private when I use the XLSX to JSON?
Yes. This tool processes your input locally in your browser. FormatCalc does not upload or store what you enter.
How do I use the XLSX to JSON?
Choose or paste your file data, then choose Convert to JSON. The conversion stays on your device.
What should I check before using the result?
JSON preserves nested objects, arrays, numbers, booleans, and null values, but it requires quoted property names and does not allow comments. XLSX is a workbook format. These tools operate on the first worksheet and use the first row as column names where a table structure is required. Processing happens in this browser. Your entered text and selected files are not sent to FormatCalc for conversion.