Can I open XLS files without Microsoft Excel?

Yes. Our online XLS viewer allows you to open and view legacy Excel 97-2003 files directly in your browser without installing Microsoft Excel or Office.

What is the difference between XLS and XLSX?

XLS is the legacy binary format used by Excel 97-2003, limited to 65,536 rows. XLSX is the modern XML-based format from Excel 2007+ supporting over 1 million rows.

Does it work on mobile devices?

Yes. You can view XLS files on Android phones, iPhones, and tablets using any modern web browser.

Can I convert XLS to XLSX?

Yes. After viewing your XLS file, you can export or convert it to the modern XLSX format for better compatibility.

Is it safe to upload old Excel files?

Yes. Files are processed securely and automatically deleted after viewing. We do not store or share your spreadsheets.

Online File Opener

Tools API About

Login

Online XLS Viewer - Open Legacy Excel Files in Your Browser

Online File Opener

Advanced online file viewer supporting 100+ file formats. Open, view, and analyze documents, images, archives, code files, and more - securely in your browser without installation.

SSL Encrypted

Bank-level security

Privacy First

Files stay in your browser

File Viewers

DOCX Viewer
PDF Viewer
Image Viewer
Video Viewer
Audio Viewer
Archive Viewer
Code Viewer
Database Viewer

Resources

Supported Formats
FAQ
API Docs
Unknown Files

Company

About Us
Contact Us
Privacy Policy
Terms of Service

100+

File Formats

1M+

Files Opened

Made with❤️for developers and professionals worldwide