CSV .csv
Tabular text with comma-separated fields. Formatting and multiple sheets are not preserved.
CSV file format guideCSV to XLSB converter
Convert CSV (.csv) to XLSB for free. Choose files, review the available settings and download your results. No account needed.
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Excel binary workbook .xlsb
An Excel workbook with binary worksheet records inside a ZIP package. XLSB is useful for exchanging stored spreadsheet data with Excel.
Values are converted without running macros or recalculating formulas. Charts, formatting, and macros are not preserved.
XLSB file format guideHow to convert CSV to XLSB
- Select CSV files from your device or drag them into the converter.
- Check the XLSB output. Open conversion settings if you want to make adjustments.
- Convert, compare the original and result, then download your files.
Quality, compatibility and file limits
Choose a sheet for CSV, TSV, JSON, HTML, DBF, DIF, SYLK, or WK1 output. Workbook formats export stored cell values. Formulas are not recalculated; macros, charts, and original styling are not preserved.
Processing uses your device when possible and our servers when required. Browser files are limited to 256 MB each; server conversions to 64 MB; browser spreadsheets to 32 MB. Previews show supported content and do not guarantee identical rendering in every application.