Converter
CSV, TSV, ODS, XLS to XLSX Converter
Convert Sheet to XLSX locally in your browser. Normalize data to an Excel workbook.
1Private — files stay local
Add documents
PDF, DOCX, images, spreadsheets or text files.
Drop documents or browse
PDF, Word, Excel, text files.
No files selected yet.
2
Choose tool
CSV, TSV, ODS, XLSXLSX
Normalize spreadsheet or delimited data to XLSX.
3
Settings & convert
Frequently asked questions
Quick answers about converting CSV, TSV, ODS, XLS to XLSX in your browser.
How do I convert CSV, TSV, ODS, XLS to XLSX?
Add your CSV, TSV, ODS, XLS file to the converter, start the conversion, and download the XLSX file. Everything runs in your browser.
Is the CSV, TSV, ODS, XLS to XLSX converter free?
Yes. The CSV, TSV, ODS, XLS to XLSX converter is completely free with no sign-up, no watermarks, and no file count limits.
Are my files uploaded to a server?
No. Your files are read and converted locally in your browser, so they never leave your device.
What devices and browsers are supported?
It works in any modern browser on desktop, laptop, tablet, or phone — there is nothing to install.