Here are 5 Free services to convert .xlsx files to .xls online. .xlsx files are generated by newer versions of Microsoft office, including Excel 2007 and Excel 2010. If you are still using an older version of Office, you will not be able to open .xlsx files in that.
Thankfully, there are many free online file converters available that can convert .xlsx to .xls online free.
1. ConvertFiles.com: ConvertFiles is a very comprehensive online file converter. It can easily convert your .xlsx file to .xls format. You can upload the .xlsx file from your local PC, or you can also provide URL of a .xlsx file if it is hosted online.
After that, you can choose your conversion format. ConvertFiles lets you convert .xlsx files to .xls, .ods, .csv, .pdf, .html, and .zip format. Then you can download the converted file immediately, or you can even choose to send download link to your email.
ConvertFiles is completely free .xlsx to .xls converter, and an easy way to convert .xlsx to .xls easily. You can also try free .docx to .doc converter.
2. Docx2Doc.com: This is another free .xlsx to .xls converter. It is completely free, and online. You can upload .xlsx file, and convert it to .xls format. It can also convert .xlsx to .ods, xlsx to html, xlsx to pdf, xlsx to txt, xlsx to doc, and xlsx to docx format.
3. Convert-Doc.com: This is exactly same as Docx2Doc.com, and is also from the same company. So, if the above option doesn’t works for you, you can try this free .xlsx to .xls converter.
4. Zamar: This is one of the most popular online file converters. It can convert lot of different file types online. You can upload a file from your PC, or provide it the file URL. Only problem with Zamar is that it does not lets you directly download the file, and instead sends you the file on your email address. If you do not want to share your email address, you can use a free temporary email address.
5. FreeFileConvert.com: This one looks a lot like Zamar, but the advantage that you get with this free .xlsx to .xls online converter is that it does not asks for your email address, and you can directly download the converter file.