To make you sure whether the site you are surfing is free from viruses or malwares or not there are some websites which give you option of scanning a website if you suspect that website carries some harmful content.
1.AVG Online Web Page Scanner
ASG doesn't suggest scanning every website you come in contact with, but you scan websites that you might be scared of.
You just needs type the URL you want to scan in AVG ONLINE WEBSITE SCANNER and hit enter.
For instance, if you get an email and you really want to read it but don't want to risk damage to your computer. Just copy and paste the URL into the Webpage Scanner from AVG. It will scan the webpage for bad links and report it to you without every having to visit the website.
2.Virus Total
Virus Total is a free virus, malware and URL online scanning service.In addition to scanning URLs it also scans Files of size less than 64 MB.
3.MyWot
It provides browser extensions for Firefox,Chrome and IE.Its extension checks every webpage before loading it.Go to there website http://www.mywot.com/
4.Google Diagnostic
One of the best tool for Checking whether site hosts malware or not.
go to http://google.com/safebrowsing/diagnostic?site= the url of site you want to check
eg .
http://google.com/safebrowsing/diagnostic?site=techandfunworld.blogspot.com
5.Online Link Scan
Online Link Scan collects and summarizes the threat reports of the aforementioned Phishtank, AVG and Google Safe Browsing engines.
I think i have provided you all best options available for online security so always try to use them if you suspect any site or if your Stand Alone Antivirus provides Add ons for your browser enable that.
List of 5 best sites to check whether a website is safe or not