Convert XLS to XLSX in bulk.
Large XLS files are supported.

Max size: 200 MB per file

You can convert XLS Learn more about XLS files to


How to convert XLS to XLSX?

You can convert XLS to XLSX with MConverter in three easy steps:
  1. Choose XLS files from your device
    At the top of this page, drag and drop your XLS's.
    You can also click to select XLS files using your operating system's file chooser.
    Another method is to press Ctrl+V to paste an XLS file you have copied to clipboard.
  2. Click or tap on XLSX from the list of target formats
    Alternatively, you can use the search field to quickly find the format you need, whether it's XLSX or something else.
  3. Download your XLSX files, after MConverter has finished processing them
    There's an option to automatically download the converted XLSX files, so you don't have to press the download icon for each XLSX.

About the formats

Extension xls
Category Document/Office file formats
Developed by Microsoft
Mime type application/


Spreadsheet compatible with Microsoft Office Excel 2003 and older.
Extension xlsx
Category Document/Office file formats
Developed by Microsoft
Mime type application/vnd.openxmlformats-officedocument.spreadsheetml.sheet


An XLSX file is an Excel Spreadsheet, designed for Microsoft Office 2007 and newer. To open XLSX files with Office 2003 or earlier, you need to convert them to XLS.

Common questions about converting XLS to XLSX

Can I convert XLS to XLSX in bulk?

Yes, MConverter supports batch converting of multiple XLS's to XLSX's simultaneously. You can even drag and drop folders containing XLS's to convert to XLSX.
Pasting XLS files and folders copied in the clipboard also works: use Ctrl+V.

Can I convert an XLS file to XLSX, if its size is 1 GB?

Yes, with MConverter Premium you can convert big XLS's, up to 1 gigabyte each.
The free version lets you convert files up to 200 MB. If you need to convert XLS files over 200 megabytes, try MConverter Premium.

Is converting XLS's to XLSX safe with MConverter?

Yes, we encrypt your connection using industry standards. Plus, your XLS files are only accessible by you. 24 hours after the conversion completes, they are automatically deleted from MConverter’s servers. You can also delete your XLS's and other converted files immediately after finishing the conversion by clicking the bin icon.
Join others who have trusted us to convert over 2,164,784 files so far.

How long does it take to convert XLS to XLSX?

For most documents, the wait may be a minute or so. However, MConverter also supports converting larger documents, meaning that it could take a while (up to over an hour, for example).
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