https://sejda.com
This site is very useful to do PDF related work like editing, merging and converting of documents online.
https://www.safeweb.norton.com
This is another wonderful tool for determining whether or not files or URLs have been tainted with malware or viruses.
This website is a very useful tool to translate a particular text, documents and a complete website also.
https://translate.google.com
This site is very good to compress the images instantly in the browser window only. No need to install any sort of program to compress photos.
https://www.Smaller Pictures-appspot.com
This is easy to use countdown timer.
https:/e.ggtimer.com
https://www.unscreen.com
This website is very useful to change the background of any video.
https://apps.diagrams.net
https://www.systemrequirementslab.com
This is a very good site to find your computer specifications in a jiffy.