Best Tools to Validate your Website Free and Online
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When you are designing your website it is important to check your site as you go. Checking your site now can save a lot of time later to correct any errors or bugs.
What are the Best Tools to Validate your website
Responsive Web Design Checker

Responsive Web Design Checker ensures that your website looks the way you want on many different devices.
With everyone accessing the internet from a mobile device these days it is important that your website looks it’s best on any device.
Just enter your website’s URL and let Responsive Web Design Checker do the rest. You can check your websites responsiveness on desktop, tablet or mobile device as well as any size in between. When you enter your url you will see and browse the exact website as an actual user visiting your website.

Whois Lookup

DomainTools Whois Lookup tool gives you information about any domain on the internet.
Doing a Whois lookup before launch will allow you to check and make sure that if you purchased domain privacy that it is properly set.
whatsmydns.net

whatsmydns.net is a dns propagation website to help you make sure you website is set correctly around the world.
Whenever you sign up for web hosting or make any kind of dns changes you need to make sure your website’s dns is set.
whatmydns.net can check various dns records such as A records, CNAME records, MX records, NS records, TXT records, etc.
MX Toolbox What is my IP

MX Toolbox What is my IP will tell you what your IP address is. This helps you when you need to troubleshoot your website or review a log file.
W3C Markup Validation Service

W3C CSS Validation Service
