XLS to XLSX Converter

Batch convert xls files to xlsx online. Change xls to xlsx on Windows, Mac, Iphone or Android in a couple of clicks.

Select files for conversion or drag and drop them to the upload area.
Your files are securely protected and available only to you.
All files are automatically deleted from our servers after 1 hour.

How to convert XLS files to XLSX online?

Step-by-step instructions for converting xls files to xlsx

Upload XLS-file

Click "Choose File" button to select a xls file on your computer. XLS file size can be up to 100 Mb.

Convert XLS to XLSX

Click "Convert" button to start conversion.

Download your XLSX

When the conversion process is complete, you can download the XLSX file.

FAQ

  • ❓ How can I convert XLS to XLSX?
    First you need to add file for conversion: drag and drop your XLS file or click the "Choose File" button. Then click the "Convert" button. When XLS to XLSX conversion is completed, you can download your XLSX file.
  • ⏱️ How long does it take to convert XLS to XLSX?
    Document conversion is pretty fast. You can change XLS to XLSX in a few seconds.
  • 🛡️ Is it safe to convert XLS to XLSX on AnyConv?
    Of course! We delete uploaded files immediately, and converted ones after 1 hour. No one has access to your files. File conversion (including XLS to XLSX) is absolutely safe.
  • 💻 Can I convert XLS to XLSX on Mac OS or Linux?
    Yes, you can use AnyConv on any operating system that has a web browser. Our XLS to XLSX converter works online and does not require software installation.

Information about XLS and XLSX file formats

Name XLS XLSX
Full name XLS - Microsoft Excel Binary File Format XLSX - Office Open XML Document
File extension .xls .xlsx, .xlsm
MIME type application/vnd.ms-excel application/vnd.-openxmlformats-officedocument.-spreadsheetml.-sheet
Developed by Microsoft Microsoft
Type of format Spreadsheet Spreadsheet
Description Microsoft Excel, up until 2007 version used a proprietary binary file format called Excel Binary File Format (.XLS) as its primary format. Excel 2007 uses Office Open XML as its primary file format, an XML-based format that followed after a previous XML-based format called "XML Spreadsheet". The Office Open XML file formats are file formats that can be used to represent electronic office documents. There are formats for word processing documents, spreadsheets, presentations, and specific formats for material such as mathematical formulae, graphics, bibliographies, etc.
Technical details OpenOffice.org has created documentation of the Excel format. Since then, Microsoft has made the Excel binary format specification available to download freely. Office Open XML documents are stored in Open Packaging Convention (OPC) packages, which are ZIP files containing XML and other data files, along with a specification of the relationships between them. Depending on the type of document, the packages have different internal directory structures and names.
File conversion XLS conversion XLSX conversion
Associated programs Microsoft Office, LibreOffice, Kingsoft Office, Google Docs. Microsoft Office, LibreOffice, Kingsoft Office, Google Docs.
Wiki https://en.wikipedia.org/wiki/Microsoft_Excel#File_formats https://en.wikipedia.org/wiki/Office_Open_XML_file_formats
XLS to XLSX conversion quality rating:
4.6 (1408 votes)
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