XLSB to CSV Converter

Convert Excel binary workbooks (.xlsb) to CSV without Excel. Every sheet, values exactly as Excel shows them, and nothing uploaded.

  • No Excel needed
  • All sheets in one go
  • Values as shown
  • Files never uploaded
No upload. No sign-up. No file size cap.

Your files are converted on your own device. Nothing is uploaded, stored or seen by us.

How it works

How to convert XLSB to CSV

  1. Add your .xlsb file

    Drag it onto the box above or click Choose files.

  2. Pick a sheet

    Click a sheet tab to see a live preview of the CSV.

  3. Download

    Save the sheet as a CSV, or every sheet at once as a zip.

About the format

What is an XLSB file?

XLSB is Excel's binary workbook format. It holds everything an .xlsx file does, but stores it as compact binary records instead of XML, so very large workbooks open and save faster and take less space. Finance and reporting teams often use it for files with hundreds of thousands of rows.

The catch is that fewer programs can read it. Google Sheets doesn't import .xlsb at all, and many online converters reject it. This converter reads the binary records directly in your browser.

What you get

  • Every worksheet as its own CSV, named after the sheet. Chart sheets are skipped because they hold no cells.
  • Numbers, dates and currency formatted the way Excel displays them, or raw values if you prefer.
  • Formulas written as the result Excel last saved, which is what Excel itself puts in a CSV.

Using Excel instead

If you have Excel, open the file and use File › Save As › CSV UTF-8 (Comma delimited). It saves one sheet at a time. Or save the workbook as .xlsx so that other tools can read it.

FAQ

Questions

Why can't Google Sheets open my XLSB file?

Google Sheets doesn't support the .xlsb format. Convert it to CSV here, or open it in Excel and save it as .xlsx, which Sheets can import.

Is XLSB to CSV conversion lossless?

The values are kept exactly as Excel shows them. Formatting, formulas, charts and macros can't be stored in a CSV, so they're dropped, the same as when Excel saves a CSV.

Does XLSB keep macros?

An .xlsb file can contain macros, but a CSV can't. The converter only reads cell values and never runs any macro, so it's safe to use with files from others.

How large an XLSB file can it handle?

It depends on your computer's memory rather than a set limit. Binary workbooks are compact, so files with hundreds of thousands of rows usually convert in a few seconds.