XLSX converter

Free online conversion of files to xlsx and vice versa
Select files or drag & drop them here
About XLSX

The XLS files are used in Microsoft Excel 97 to 2003 for Workbooks, spreadsheet document files. The XLS is Microsoft Excel's proprietary file format for storing its documents. The latest versions of Microsoft Office use XLSX file format. XLSX format uses ZIP compression for smaller file sizes.

How to convert a file to XLSX?

Click the «Choose files» button and select the files you want to convert. The maximum file size is 75 MB.

Select «XLSX» as the target format. Click «Convert» to start converting files to XLSX. It will only take a few seconds.

You did it! Your files have been converted to XLSX format. Now download them to your device.

Supported conversions

MiConv can convert files to XLSX format and vice versa. Check the table below.

Advantages of MiConv

Online XLSX conversion

You don't need to download and install any software to convert files to .xlsx format. All conversions take place in the cloud.

File security

Your files are completely safe and accessible only to you. All files will be permanently deleted within 2 hours after conversion.

Fast and free

Convert your xlsx files in 2 clicks. And don't pay anything for it! This XLSX converter is free for all users.

See also

In addition to XLSX, we can convert many other file formats. Here are some popular conversions:
Over 1,500,000 users in 235 countries have used MiConv to convert files in 2022

So you're in good company! 👍🏻