Convert NUMBERS to XLSB

Convert NUMBERS files to XLSB 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 NUMBERS to XLSB

Drop your .numbers files above, or click Upload Files. You can add many files at once.
XLSB 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 .xlsb files as soon as each one finishes.

What to know about NUMBERS to XLSB conversion

Cell values, number formats and sheet names carry over. Formulas are saved as their last calculated values in XLSB, and cell styling, charts and macros are not preserved.
XLSB is best for very large Excel workbooks that must open fast, and opens in Excel and LibreOffice.

NUMBERS vs XLSB

Feature	NUMBERS (Apple Numbers)	XLSB (Excel Binary Workbook)
Multiple sheets	Yes	Yes
Formulas and formatting	Yes	Yes
Best for	spreadsheets created on Mac, iPhone or iPad	very large Excel workbooks that must open fast
Opens in	Apple Numbers	Excel and LibreOffice

NUMBERS (Apple Numbers): The spreadsheet format used by Apple Numbers on macOS and iOS.

XLSB (Excel Binary Workbook): A binary Excel format that loads and saves large workbooks faster than XLSX.

Conversion options

Active sheet only or all sheets
Custom output file name

Frequently asked questions

Is it safe to convert NUMBERS to XLSB 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 NUMBERS 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

Convert NUMBERS to other formats

Convert other formats to XLSB

See every NUMBERS converter and XLSB converter, or browse the full converter directory.