No upload endpoint
Spreadsheet tools
Convert spreadsheet data between practical open formats. Choose a task, add your file, and download the result without creating a server copy.
XLSX to CSVConvert the first worksheet in an Excel workbook to UTF-8 CSV.CSV to JSONTurn a CSV file with headers into structured JSON.JSON to CSVConvert an array of JSON objects into CSV.
Why run spreadsheet tools in the browser?
The browser removes the upload round trip and the need for server storage. Available memory and codec support still set practical limits, so those constraints are stated instead of hidden behind a vague “private” label.
Inspect the network boundary