XLS to XLSX converter

This online document converter lets you convert your files from XLS to XLSX in high quality.

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Convert XLS to XLSX

We support many file formats such as PDF, DOCX, PPTX, XLSX and more. With the online-convert.com conversion technology, you get very accurate results.

How to convert a XLS file to a XLSX file

Choose the XLS file you want to convert
Optional: change quality or size
Click "Start conversion" to convert your file from XLS to XLSX
Download your converted XLSX file

To convert in the opposite direction, click here to convert from XLSX to XLS:

XLSX to XLS converter

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Convert to XLS

CSV to XLS

ODS to XLS

PDF to XLS

XLSX to XLS

Convert from XLS

XLS to 7Z

XLS to BMP

XLS to EPS

XLS to GIF

XLS to HTML

XLS to ICO

XLS to JPG

XLS to PDF

XLS to PNG

XLS to RTF

XLS to SVG

XLS to TAR.BZ2

XLS to TAR.GZ

XLS to TGA

XLS to TIFF

XLS to TXT

XLS to WEBP

XLS to ZIP

File format

File Format

XLS (Microsoft Excel Spreadsheet)

XLS is the file format extension for Microsoft Excel files. The XLS extension was used until the 2007 version of Excel and was replaced by an Open Office XML file format (XML Spreadsheet, or XMLSS). Excel 2007 is backwards compatible and reads many f...

File Format

XLSX (Microsoft Excel Open XML Spreadsheet)

XLSX files are produced by the applications of Microsoft's 2007 Office suite, namely by the product called Microsoft Excel, a spreadsheet processing software that is known all around the globe. As a very efficient tool, Excel can format and create sp...