Convert XLSB to XLSX
Convert XLSB files to XLSX locally, completely free and with maximum privacy.
Drag and drop your files here
or click to browse local files (large files supported, limited only by browser RAM)
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How to convert XLSB to XLSX
- Drop your .xlsb files above, or click Upload Files. You can add many files at once.
- XLSX is already selected as the output. Open the settings (gear icon) to fine-tune the result.
- Click Convert All. SheetJS runs inside your browser through WebAssembly; nothing is uploaded.
- Download your .xlsx files as soon as each one finishes.
What to know about XLSB to XLSX conversion
- Cell values, formulas, number formats and sheet names carry over; cell styling (colors, fonts, borders), charts and macros are not preserved.
- XLSX is best for everyday spreadsheets shared with Excel users, and opens in Excel, Google Sheets, LibreOffice and Numbers.
XLSB vs XLSX
| Feature | XLSB (Excel Binary Workbook) | XLSX (Excel Workbook) |
|---|---|---|
| Multiple sheets | Yes | Yes |
| Formulas and formatting | Yes | Yes |
| Best for | very large Excel workbooks that must open fast | everyday spreadsheets shared with Excel users |
| Opens in | Excel and LibreOffice | Excel, Google Sheets, LibreOffice and Numbers |
XLSB (Excel Binary Workbook): A binary Excel format that loads and saves large workbooks faster than XLSX.
XLSX (Excel Workbook): The default Microsoft Excel workbook format since Office 2007, based on Office Open XML.
Conversion options
- Active sheet only or all sheets
- Custom output file name
Frequently asked questions
Is it safe to convert XLSB to XLSX here?
Yes. Your files are processed entirely on your own device by WebAssembly code running in the browser. They are never uploaded, so nobody else can see them, and the converter keeps working even if your connection drops after the page loads.
Is there a file size limit?
There is no server-side limit. The only limit is the memory available to your browser, typically 1.5–4 GB on desktop computers.
Can I convert several XLSB files at once?
Yes. Add as many files as you like; they are converted in parallel according to your device's CPU cores, and you can apply the same settings to all of them.
Related conversions
Need the opposite? Convert XLSX to XLSB.
Convert XLSB to other formats
Convert other formats to XLSX
See every XLSB converter and XLSX converter, or browse the full converter directory.