10 Website testing and optimization tools

Here are 10 useful tools for testing your website's quality, speed and mobile readiness.

website tools

W3C Markup Validation Service – This is an excellent tool for testing the markup validity of Web documents to identify errors and ensure compliance with Web standards.

W3C CSS Validation Service – Checks for stylesheet errors.

Google Structured Data Testing Tool – This tools checks for the presence of structured data on webpages and identifies errors.

Nibbler – This site tests a website's performance in terms of accessibility, user-friendliness, popularity, code quality, technology and other factors.

GTmetrix – Measures page speed and identifies factors that affect page loading, such as JavaScript parsing, redirects, image optimization and many others.

WebPagetest – This tool tests for such factors as transfer speed, image compression, CDN use, and caching of static content.

Google PageSpeed Insights – Tests and identifies factors that affect page speed and performance on mobile devices and desktops.

Google Mobile-Friendly Test – Analyzes a URL and reports if the page has a mobile-friendly design.

Screenfly – A tool for testing responsive design, allowing you to see how your pages look like at different screen sizes.

Cowemo Mobile Phone Emulator – A tool for emulating some common mobile devices.

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