Convert XLS to XLSX
Turn XLS files into XLSX in seconds — free.
- Works directly in your browser
- Keeps the original formatting and quality
- Download your file in seconds
- No signup, no watermark, no limits
- Supports batches of XLS files up to 100 MB each
Upload your files
Drop XLS files here
Files up to 100 MB · deleted automatically after 4 hours
How the conversion works
Three steps between your XLS file and a finished XLSX.
Add your XLS file
Drag and drop it, or browse your device. Multiple files are fine.
Confirm XLSX settings
Choose quality and naming, then start the conversion.
Download
Save the XLSX file, or scan the QR code to grab it on your phone.
About converting XLS to XLSX
XLS and XLSX solve different problems, which is why this conversion is so common. Our converter reads the structure of your XLS file and rebuilds it as a valid XLSX file rather than simply renaming it, so the result opens cleanly in the apps you already use.
XLS is the older binary spreadsheet format from Microsoft Excel. XLSX is the spreadsheet format used by Microsoft Excel.
The converter sits in our document converters toolkit alongside PDF, DOCX, DOC, XLSX, XLS, PPTX, PPT, TXT, RTF, ODT, ODS, ODP, CSV, HTML and more. Nothing is installed, nothing is stored, and the output carries no watermark.