Local, private conversion

Convert XLSB to XLSX privately

Drop your XLSB file, preview the XLSX result locally, and download without uploading your file.

Stays in your browser Adjust before saving PDF Studio included

Drop one or more files here or choose from your device One file opens the detailed view; several create a private batch. Processed on this device

Common source formats

AVIFBMPCSVDOCXGIFHTMLICOJPG

How to convert XLSB to XLSX

Convert XLSB to XLSX locally in your browser. The file is read on your device, rewritten for the selected format, and downloaded without an upload step.

Steps

Drop or choose your XLSB file.
Confirm XLSX as the result format.
Preview the result when available, then download the converted file.

Best for

XLSB files.
Extracting workbook rows to CSV, TSV, or JSON.
Private browser-based conversion without an upload step.

What changes

Extracting workbook rows to CSV, TSV, or JSON.
Tabular values are written to the first XLSX worksheet.
Source formatting, formulas, charts, images, comments, and macros are not included.
Nested JSON values are stored as compact JSON text.
Structured values are rewritten for the selected data format.

Can I convert XLSB to XLSX without uploading?

Yes. ConvertRS runs supported conversions in your browser and keeps the file on your device.

What changes when I create XLSX?

Extracting workbook rows to CSV, TSV, or JSON. Tabular values are written to the first XLSX worksheet. Source formatting, formulas, charts, images, comments, and macros are not included. Nested JSON values are stored as compact JSON text. Structured values are rewritten for the selected data format.

What happens to my original XLSB file?

It stays on your device. The page reads the file locally so you can preview and download the converted result.