XLSX XLSB

Convert XLSX to XLSB

Free online converter — change .xlsx files into .xlsb format instantly. Drag, drop, convert, download.

Drop your .xlsx file here

or click to browse · max 100MB

🔒 Your file is processed in your browser where possible.

How to convert XLSX to XLSB

  1. 1 Upload your .xlsx file using the dropzone above.
  2. 2 Click "Convert to XLSB" and watch the progress bar.
  3. 3 Once complete, click Download to save your new .xlsb file.