Online virus scan ( Before Download it before scan it !!!!! )

https://www.virustotal.com/

VirusTotal is a free service that analyzes suspicious files and URLs and facilitates the quick detection of viruses, worms, trojans, and all kinds of malware.

You can scan virus 3 use options,

                                      1) Upload a file

                                      2) Give URL and scan it

                                      3) Search and scan it