XLS to XLSX Converter
Convert XLS to XLSX online at Convertig.com. Fast, free, and secure spreadsheet converter—no software required. Upload your XLS file and get XLSX instantly.
100 MB maximum file size and upto 5 files.
300+ formats supported
We support more than 25600 different conversions between more than 300 different file formats. More than any other converter.
Fast and easy
Just drop your files on the page, choose an output format and click "Convert" button. Wait a little for the process to complete.
How to use XLS to XLSX Converter?
- Click the “Choose Files” button to select your files (up to 20 files at a time)
- Click on the “Convert” button to start the conversion
- When the status change to Done” click the “Download” button
XLS to XLSX Converter FAQs
Our converter processes your XLS file and transforms it into the updated XLSX format while preserving all data, formulas, and formatting. Simply upload your file, and the conversion happens automatically in seconds.
Yes, to ensure fast and efficient conversions, we have a maximum file size limit. Check the current limit on our website before uploading large XLS files for conversion.
Absolutely. We prioritize data security—your files are automatically deleted from our servers shortly after conversion, and we do not store or share them with third parties.
Currently, our converter supports single-file conversions. For batch processing, you’ll need to convert each file individually to ensure accuracy and quality.
No installation is required. Our tool is entirely web-based, so you can convert XLS to XLSX directly from your browser on any device.