Convert XLS to XLSX Online

Convert XLS files to XLSX online for free. Upload your Excel 97-2003 spreadsheet, create an Excel spreadsheet, and download the result in your browser.

Drag and drop your XLS file
or choose it from your device

Drag files here. Maximum size — 5 GB

Why convert XLS to XLSX?

  • Create XLSX files without installing desktop software

  • Make XLS files easier to share, upload, or archive

  • Prepare spreadsheets and tables for clients, forms, portals, and team workflows

  • Use a format that fits the next app or device

  • Convert single files quickly online

  • Keep the workflow simple from upload to download

Quick answer

What is XLS to XLSX conversion used for?

XLS to XLSX conversion is useful when you need to turn an Excel 97-2003 spreadsheet into an Excel spreadsheet for sharing, uploading, review, archiving, or opening in another app.

  • Online conversion in the browser
  • No desktop software required
  • Useful for everyday file workflows

XLS vs XLSX

XLS
XLS
  • Excel 97-2003 spreadsheet
  • Original upload format
  • Best when you need the source file as-is
XLSX
XLSX
  • Excel spreadsheet
  • Practical output format
  • Useful for sharing, uploads, review, or editing

Converting XLS to XLSX helps prepare tables and spreadsheets for the apps, platforms, and workflows where XLSX is the better fit.

How to convert XLS to XLSX

Upload your file
Add your XLS file from your device.
Start conversion
The service prepares the XLSX output.
Download the result
Save the new XLSX file.

Who uses XLS to XLSX conversion?

Office user

Convert tables for reports, client delivery, internal review, online forms, and everyday admin work.

Content creator

Prepare spreadsheet data for publishing, sharing, lessons, reports, and reusable resources.

Teams and students

Move files into the format required by collaborators, classrooms, portals, or shared devices.

Why choose us

We ensure quality, convenience, and support for all formats.

High-quality conversion
High-quality conversion
We guarantee precise file conversion without any loss of quality.
Support for multiple formats
Support for multiple formats
You can convert your files from over 200 different formats, including images, documents, and more.
Compatible with all devices
Compatible with all devices
Convert files from any device – whether it's a computer, tablet, or smartphone.
User-friendly interface
User-friendly interface
Our service is designed to make conversion easy for everyone in just a few simple steps.
Full data security
Full data security
All files are transmitted and stored using advanced encryption technologies.
High-speed processing
High-speed processing
Thanks to cloud technology, we ensure fast processing even for large files.

Related XLS and XLSX converters

More useful conversion paths for XLS and XLSX files.

document converter iconPDF to XLSXConvert to XLSXspreadsheet converter iconODS to XLSXConvert to XLSXspreadsheet converter iconCSV to XLSXConvert to XLSXspreadsheet converter iconXLSX to PDFXLSX outputsspreadsheet converter iconXLSX to HTMLXLSX outputsspreadsheet converter iconXLSX to ODTXLSX outputsspreadsheet converter iconXLSX to CSVXLSX outputs

Convert XLS to other formats

spreadsheet converter iconXLS to XLSXMicrosoft Excel Spreadsheet to XLSX

Convert to XLSX: supported formats

database converter iconSQL to XLSXStructured Query Language to XLSXdocument converter iconPDF to XLSXPortable Document Format to XLSXspreadsheet converter iconXLS to XLSXMicrosoft Excel Spreadsheet to XLSXspreadsheet converter iconODS to XLSXOpenDocument Spreadsheet to XLSXspreadsheet converter iconCSV to XLSXComma-Separated Values File to XLSX

Frequently Asked Questions

Yes, you can upload a file and convert it online without registration.

No. The conversion runs online in the browser workflow.

XLSX is a practical output format for common apps, devices, and upload workflows.

Files are processed automatically. Avoid uploading confidential files to public online tools.

About XLS to XLSX conversion

XLS files are useful in their original context, but another format is often better for sharing, uploading, review, editing, or archiving. Converting them to XLSX creates an Excel spreadsheet that fits the next step of the workflow.

A browser-based converter is useful when you need a quick result without installing software or changing your main spreadsheet setup. Upload the Excel 97-2003 spreadsheet, start the conversion, and download the new XLSX file.

Choose XLSX when that format matches the app, platform, or delivery requirement you need next.