A Collection Of Great Free Diagnostic Tools for Webmasters & Marketers (with links)

Here’s a small collection of free diagnostic tools we use often on behalf of our clients.  Hotjar is free for their “Basic” plan but you’ll need a paid account to utilize all the features.

google pagespeed insights logo
From Google, the same tool Google uses to pull pagespeed (it's one factor in the organic search ranking algorithm) offered to you, for free. Helps identify speed issues with your site & how to fix them.
why no padlock logo
Why No Padlock is a great tool which helps you identify problems with your site's SSL Certificate implementation and how to fix.
google structured data testing tool logo
From Google, checks any URL for structured data (schema.org, microdata). A good way to check to make sure your structured data tags are setup correctly.
gtmetrix logo
How fast does your website load? See how your site performs, reveal why it's slow and discover optimization opportunities.
mx toolbox logo
MxToolbox provides free, fast and accurate network diagnostic and lookup tools.
google trends logo
Google Trends provides access to a largely unfiltered sample of actual search requests made to Google. Great tool for keyword research to see relative popularity of 2 or more search terms.
icann logo
WhoIs Domain lookup tool from the Internet Corporation for Assigned Names and Numbers (ICANN), a non-profit.
whatsmydns logo
whatsmydns.net lets you instantly perform a DNS lookup to check a domain names current IP address and DNS record information against multiple name servers located in different parts of the world. This allows you to check the current state of DNS propagation after having made changes to your domains records.
hotjar company logo
Hotjar is a UX/UI tool which enables you to see how visitors interact with your site. Heatmaps, Click Maps, Session Recording & More. 'Basic' plan is Free (but with limits).