Use the free Zamzar online conversion service to convert from an XLSX file to an XLS format. You only need a computer with an Internet connection, a Web browser and an XLSX file to get started.Continue Reading
Open your preferred Web browser. Wait for the start page to load.
Type the Zamzar Web address in the URL text field. Press Enter on your keyboard, and wait for the Zamzar homepage to load.
Click the Choose Files button, and navigate to your XLSX file. Click Open to upload the file to Zamzar.
Click the "Convert files to" drop-down box to reveal a format list. Select XLS under the Document Formats subheading.
Type your active email address in the text field. Zamzar sends a link to the converted XLS file to your email address, so mark Zamzar as safe in your email to prevent your Gmail, Yahoo or similar email service from classifying the message as spam.
Click the Convert button to start the conversion process. After a few moments, check your email for a link to download your converted XLS file.