Welcome to ToolYour's Free Online XLS to XLSX Converter, your reliable solution for converting XLS files to XLSX format instantly. Whether you're a professional, student, or business owner, our converter makes it easy to transform your XLS documents into XLSX format with just a few clicks.

Converting XLS to XLSX is essential for many reasons. XLS files are widely used, but sometimes you need them in XLSX format for compatibility, sharing, archiving, or specific software requirements. Our free online converter eliminates the need for expensive software or complicated installation processes.

One of the key benefits of using our XLS to XLSX converter is its speed and accuracy. Our advanced conversion engine processes your files quickly while maintaining the highest quality standards. The tool supports single file upload from your device, allowing you to upload and convert one XLS file at a time with precision, preserving formatting, structure, and content integrity.

Our converter is perfect for various use cases. Professionals can convert XLS files to XLSX for client presentations, reports, or documentation. Students can transform XLS assignments into XLSX format for submission requirements. Businesses can standardize file formats across teams or convert documents for different software applications.

Security and privacy are our top priorities. All files uploaded to our converter are processed securely using encrypted connections. Your files are automatically deleted from our servers immediately after conversion completes, ensuring your documents remain private and confidential. We never store, share, or access your files beyond the conversion process.

The conversion process is incredibly simple. Just upload your XLS file (up to 10MB in size) directly from your device - whether it's your computer, smartphone, or tablet. Click the convert button, and our tool will automatically convert it to XLSX format. Within seconds, your converted file will be ready for download. No registration required, no sign-up needed, and no hidden fees - just instant, free conversion whenever you need it.

Please note that this converter only supports single file upload from your device. You cannot use URLs, paste links, or upload multiple files at once. Simply select a file from your device, upload it, convert it, and download the result. You can convert as many files as you need, one at a time.

Our XLS to XLSX converter supports files up to 10MB in size and maintains quality throughout the conversion process. Whether you're converting a simple text document or a complex file with formatting, images, or special elements, our tool handles it all with precision. For files larger than 10MB, we recommend splitting them into smaller parts before conversion.

Best of all, our converter is completely free to use with no limitations. Convert XLS files to XLSX as often as you need, one file at a time, without any restrictions. Start converting your files today and experience the convenience of free, instant XLS to XLSX conversion! Our XLS to XLSX converter ensures maximum accuracy and preserves all formatting details during conversion. The tool supports various XLS file versions and provides reliable XLSX output.