I understand that sometimes you don't like to install video downloading software which will just consume space on your storage and might cause harm to your computer, it's because most free software have adds-on that might collect your data and you might even accidentally install a malware.

Solution:

To download a Facebook video without any software, you need a site that offers online download for free.First you need to open the video on Facebook that you want to download. Copy the URL of the Facebook video and paste it on the a site listed below.

Hint: A video URL on Facebook has the word "theater" in the end.
Here I collected some sites where you can do the download.You can further find instruction on the sites.
1. http://www.downvids.net/
2. http://www.downfacebook.com/
3. http://www.fbdown.net/
Go to one of the sites and enjoy downloading. We hope this post help you.

Have any questions? Feel free to ask me via the comments section! Remember to share this tutorial with others on Facebook, Twitter & Google Plus.