Know your formats
Supported formats and limitations
- Input formats
- XLSX
- Output formats
- JSON
- Values are written as strings, including empty cells and stored date serials. Numeric precision follows the workbook’s stored value.
- Formula results come from the saved cache. Formatting, styles, and other sheets are omitted.
Select the worksheet, then choose objects keyed by the first row or arrays that include every row. Object keys must be unique and nonblank. Cell values are strings, including empty cells and numeric date serials. Formulas use the saved cache. Styling and workbook recalculation are outside this export.
Maximum input size is 8 MiB per file.
A local workflow
How to use this converter
Your file contents stay in the browser as you work.
Select the XLSX file and worksheet.
Choose first-row keys or arrays of cell values.
Download the JSON export.
A little more clarity
Frequently asked questions
What if my worksheet has blank or duplicate headers?
Choose arrays of cell values to retain the first row and its original column positions.
Is XLSX to JSON available now?
This tool runs locally with JavaScript enabled. Check its supported formats and size limits before converting.