Resource of web-based testing tools

• General & Multipurpose
• Design & Layout
• Performance
• Security
• Social Media Tags and Schema Markup
• Mobile Friendliness
• Broken Links

Browser extension that tests for SEO, speed and security best practices. Crawls your site checking multiple pages at once.

• https://a.paddle.com/v2/click/33762/34995?link=1044

Markup Validation

• https://validator.w3.org

Performance, SEO, Social, Links, Popularity

• https://insites.com/

Auditing, performance metrics, and best practices for Progressive Web Apps (Chrome Devtools and Chrome extension)

• https://github.com/GoogleChrome/lighthouse

Accessibility, security, interoperability and more

• https://webhint.io/#scanner-input

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Responsive Layout

• https://www.browserstack.com/responsive

Cross Browser Testing

• https://www.browserstack.com/screenshots

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Google PageSpeed Insights

• https://pagespeed.web.dev/

Performance

• https://www.webpagetest.org/

Pingdom Website Speed Test

• https://tools.pingdom.com/

Google's Test Your Mobile Speed

• https://testmysite.withgoogle.com

GTMetrix PageSpeed Score

• https://gtmetrix.com/

DebugBear Website Speed Test

• https://www.debugbear.com/test/website-speed

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SSL Server Test

• https://www.ssllabs.com/ssltest/

Content Security Policy (CSP) Validator

• https://cspvalidator.org

HSTS Preload

• https://hstspreload.org

Security Headers

• https://securityheaders.com

Test SSL, security headers and more

• https://observatory.mozilla.org/

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OpenGraph (Facebook Login required)

• https://developers.facebook.com/tools/debug/sharing/

Twitter Cards (Twitter Login required)

• https://cards-dev.twitter.com/validator

Google Rich Results Test

• https://search.google.com/test/rich-results

Pinterest Rich Pins Validator

• https://developers.pinterest.com/tools/url-debugger/

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Bing Webmaster Mobile Friendliness Test Tool

• https://www.bing.com/webmaster/tools/mobile-friendliness

Google Mobile Friendly Test Tool

• https://search.google.com/test/mobile-friendly

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Dead Link Checker

• https://www.deadlinkchecker.com/

Broken Link Checker

• https://ahrefs.com/broken-link-checker

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To the extent possible under law, Christian Oliff has waived all copyright and related or neighboring rights to this work.