XLS to XLSX Converter

Batch convert xls files to xlsx format online for free

Choose files or drag & drop them here.
Only you have access to your files.
All files will be deleted after one hour.

How to convert XLS files to XLSX online?

Step-by-step guide to convert xls to xlsx using AnyConv. It works on PC (Windows, Mac, Linux) and mobile devices (iPhone, Android).

Upload XLS-file

Drag and drop your XLS file into the upload area. The maximum file size is 100 MB.

XLS to XLSX

Click "Convert" to change xls to xlsx. The conversion usually takes a few seconds.

Download your XLSX

Now you can download the XLSX file. The download link only works on your device.

FAQ

❓ How can I convert files from 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

🔸 File format	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)

Convert and download at least one file to rate.