Free Tools for Website Owners: A Practical Starter Hub
A short, curated toolkit of free and reputable tools for checking speed, images, code, structured data, accessibility and HTTPS on any website.
You can check most of what matters about a website for free. These tools are maintained by browser makers, standards bodies and respected non-profits.
Speed
- PageSpeed Insights measures performance on mobile and desktop and lists specific improvements.
- Squoosh compresses and converts images in the browser with a side-by-side preview. See our guide to compressing images for the web.
Code and structured data
- The W3C Markup Validation Service checks HTML for errors.
- Google's Rich Results Test checks structured data. Our BlogPosting schema tutorial shows how to add it.
Accessibility
- WAVE from WebAIM highlights accessibility issues such as missing alt text and low contrast. Our guide on writing alt text helps fix the most common one.
Security
- Let's Encrypt provides free TLS certificates so your site loads over HTTPS. Many hosts enable it automatically.
Setup guides
Run these checks after every significant change to your site, not just at launch.
Cover photo by Christopher Gower on Unsplash.
