Upgrade Excel 97–2003 .xls workbooks to the modern .xlsx format — smaller, safer and compatible with every current tool.
or drop files here
Upgrade Excel 97–2003 .xls workbooks to the modern .xlsx format — smaller, safer and compatible with every current tool.
Drag & drop your file into the tool above, or click Choose Files to browse.
Adjust any settings in the panel on the right to match your needs.
Click the action button and wait a moment while we process your file.
Download your result — files are automatically deleted after one hour.
Built for speed, privacy and reliability — on any device.
Just upload your file, adjust any settings, and click the button. Done in seconds with no learning curve.
Your files are processed on our encrypted servers and permanently deleted within one hour of completion.
Use XLS to XLSX on Windows, Mac, Linux, iOS or Android — any modern browser works perfectly.
No account needed. XLS to XLSX is completely free with no file size limits for standard documents.
Supports DOCX, XLSX, PPTX and legacy formats. Formatting and layout are retained as closely as possible.
Yes, XLS to XLSX is completely free. There are no hidden fees, subscriptions or account requirements. Just open the tool and start.
Your files are transmitted over an encrypted HTTPS connection and automatically deleted from our servers within one hour of processing. We do not read, store or share your file contents.
There is no hard file size limit enforced by the tool. Very large files may take longer to process depending on your device's memory and browser performance.
The tool does its best to retain fonts, layouts and styles. Complex formatting with custom fonts or advanced features may not convert with 100% fidelity in all cases.
The tool works in all modern browsers including Google Chrome, Mozilla Firefox, Microsoft Edge, Safari and Opera. We recommend keeping your browser up to date for the best experience.
XLS to XLSX complete
