XLS to XLSX Converter

Convert XLS to XLSX online quickly and easily. Just upload your file, convert it, and download the XLSX in seconds.

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What is XLS ?

XLS is a file format used by Microsoft Excel to store spreadsheet data. It allows users to organize, analyze, and visualize data in tabular form, making it a versatile tool for various data management tasks.

XLS format  ▶

What is XLSX ?

The XLSX file format is a spreadsheet file format created by Microsoft Excel, which is part of the Microsoft Office suite. It is based on the Open XML format and is widely used for storing and managing data in tabular form, allowing users to perform calculations, create charts, and analyze information efficiently.

XLSX format  ▶

How to Convert XLS to XLSX in Just a Few Steps

  1. Upload your XLS file
    Drag and drop your XLS file, click 'Select Files' to upload from your device, or import directly from Dropbox, Google Drive, OneDrive, or paste a URL.
  2. Choose XLSX as output format
    The converter is preset to XLSX, but you can select any other output format before converting.
  3. Adjust settings (optional)
    If you like, tweak output options such as resolution, quality, or compression before converting.
  4. Convert the file
    Click the 'Convert' button. The conversion takes only a few seconds.
  5. Download your converted file
    Download the converted file to your device, or save it directly to Google Drive, Dropbox, or OneDrive.

Why Convert XLS to XLSX file?

XLS is the older Excel spreadsheet format used up to 2003, while XLSX is the modern standard that every current version of Excel and other spreadsheet software expects. Converting XLS to XLSX brings an old spreadsheet up to date, making it smaller, more reliable, and fully compatible with current software — and it raises the limits on rows, columns, and features the legacy format could not handle.

Upgrading to XLSX is especially useful when a modern program warns about an old file or opens it in a limited compatibility mode. The conversion keeps your data and formatting intact while switching to the more efficient, widely supported format. If you regularly share spreadsheets or want them to behave properly in current software, moving from XLS to XLSX is a simple, worthwhile upgrade.

Start converting XLS to XLSX now — it’s fast, safe, and completely online!

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