How to Look Up DNS Records Online (And What They Mean)
DNS records control where your domain points and how email is routed. Learn what A, CNAME, MX, TXT, and NS records do — and look up any domain's records instantly free.
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March 2026
All articles published in March 2026.
CSS px vs rem: Why You Should Stop Using Pixels for Font Sizes
Pixels ignore the user's browser font size preference — rem doesn't. Learn the difference between px, rem, and em in CSS, when to use each, and convert values instantly free.
Read ArticleCron Expressions Explained: Scheduling Jobs Without the Headache
Cron expressions look cryptic but follow a simple pattern. Learn every field, common schedules, the gotchas that catch people out, and build expressions with a free visual tool.
Read ArticleHow to Generate and Use HMAC Signatures for API Security
HMAC signatures let APIs verify that requests are authentic and unmodified. Learn how HMAC works, how to sign and verify requests, and generate signatures instantly free.
Read ArticleJSON vs CSV vs XML: Which Data Format Should You Use?
JSON, CSV, and XML all store data — but they're built for different jobs. Learn when to use each, how to convert between them, and which format your project actually needs.
Read ArticleTry the tools yourself — free.
Format, encode, generate, and convert — everything runs client-side. No account needed.