How-to guides
DNS records control where your domain sends traffic — for websites, email, verification and more. Here is how to check A, MX, TXT, CNAME and NS records instantly.
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Need HTTPS for localhost or an internal service? Here is how to generate a self-signed SSL certificate in seconds — online, with OpenSSL or with mkcert for local development.
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HTTP security headers are the fastest way to significantly improve your website's security posture. Here is what each header does, what grade it affects and how to implement them.
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Learn what meta tags and OG tags are, what each one controls, the most common mistakes that break social previews, and how to check and fix them all in minutes for free.
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Learn what UTM parameters are, how to build UTM links correctly for Google Analytics 4, and common mistakes that break your campaign tracking.
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Learn the most important .htaccess rules for redirects, HTTPS enforcement, caching, security headers, and access control — with ready-to-copy snippets.
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Learn how robots.txt works, how to write rules for specific bots, and common mistakes that accidentally block Google from crawling your site.
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Confused by binary, hexadecimal, and octal? Learn how each number system works, when developers use them, and how to convert between them instantly.
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Regular expressions look intimidating but 10 core patterns cover 90% of real-world use cases. Learn them and test free with the Anonymiz Regex Tester.
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