Testing Sites & Utilities
Mostly free tools I use regularly to fine-tune website performance
GTmetrix (Speed Test)
A simple tool that provides performance metrics related to website speed. Test your site in different browsers, varied network speeds and multiple locations. Powered by Lighthouse.
Page Explorer (On-site SEO)
A quick, free tool that analyses a page at a time. Reports on images, alt tags, nofollow links and gives recommendations on how to improve your score.
Cloudinary (Image Compression)
Discover how changes to image size, format selection, quality and encoding can dramatically improve page load speed.
W3C Validation Service
Checks the markup validity of web documents in HTML, XHTML, SMIL, MathML and more.
WebPageTest (Speed)
Detailed performance analysis with waterfall charts, filmstrip views and Core Web Vitals reporting.
Google Mobile Test
Always worth popping your URL in to confirm everything renders correctly on mobile devices.
Google Rich Results Test
Does your page contain schema? This checks if your structured data syntax is correct, straight from Google.
AI Detection on Text
Need to check if text has been AI or human written? Get a percentage score on the likelihood of it being machine-generated.
CLS Layout Shift Check
Easily identify problematic layout shifts in the viewport on mobile and desktop.