Convert CSV to XLSX
Convert CSV to Excel spreadsheet. Imports your comma-separated data into a proper .xlsx file with full spreadsheet support.
Drop your CSV files here
Up to 50MB per file.
Files are encrypted and auto-deleted after conversion
How to Convert
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Upload your CSV files
Drag and drop or select CSV files from your device. You can upload multiple files at once.
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Configure Output
Start the conversion. Crest Convert will prepare the XLSX file using the appropriate format engine.
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Download XLSX files
Once conversion finishes, download your files individually or as a compressed ZIP archive.
Why convert CSV to XLSX?
CSV is a simple tabular data format used by spreadsheets, databases, and data tools. Converting it to XLSX creates the current Microsoft Excel workbook format with worksheets, formulas, and formatted cells, ready for workflows that use the destination format.
XLSX opens in Microsoft Excel, Google Sheets, Apple Numbers, and LibreOffice Calc.
Frequently Asked Questions
What does converting CSV to XLSX do?
It creates a genuine XLSX file from your CSV. CSV is a simple tabular data format used by spreadsheets, databases, and data tools, while XLSX is the current Microsoft Excel workbook format with worksheets, formulas, and formatted cells. The result is ready for workflows that use the destination format.
What is retained in the CSV to XLSX conversion?
Records and values from CSV are arranged into spreadsheet rows and columns in XLSX, making the result convenient to sort, filter, calculate, and review.
Which apps can open the converted XLSX file?
XLSX opens in Microsoft Excel, Google Sheets, Apple Numbers, and LibreOffice Calc.
Does CSV to XLSX run in my browser?
CSV to XLSX uses a compatible conversion engine on our server. The file is transferred over an encrypted connection, processed securely, and automatically deleted shortly after conversion.
Can I batch convert CSV files to XLSX?
Yes. Add multiple CSV files, convert them together, and download each XLSX result separately or collect the completed batch in a ZIP file.
What is the CSV to XLSX file size limit?
CSV files can currently be up to 50MB.