Excel to JSON Converter

There is no upload step involved. The file is read and parsed locally through the browser file API, the page makes no upload request of any kind, and the data is gone the moment you close the tab. You can confirm this yourself in the network panel.

To keep the output structure simple and predictable. The names of every worksheet in the file are listed below the output, so if you need a different one, move it to the first position in Excel or save it as a separate file.

Excel stores dates internally as serial numbers, so a cell that carries no date formatting information parses as a plain number. If you need date strings, format the column as text in Excel first, or convert the serial numbers against the Excel epoch once you have the JSON.