Guides & notes
Shipping with AI, sharing work with clients, and the HTML details that make pages feel finished.
Meta Tags That Actually Matter in 2026 (SEO and Social)
Which meta tags affect rankings, click-through, and social sharing in 2026, which are dead weight, and copy-paste templates for th…
Fluid Typography with CSS clamp(): Stop Writing Media Queries for Font Sizes
How CSS clamp() replaces font-size media queries with one line of fluid math. Includes the linear interpolation formula, accessibi…
JSON Formatting and Validation: A Practical Guide
A practical guide to JSON syntax rules, the errors that actually break parsers, validation strategies, and how to debug malformed …
HTML Email Coding: Why Your Beautiful CSS Breaks in Outlook
Why modern CSS fails in email clients, what Outlook actually renders with, and the table-based, inline-styled patterns that surviv…
Converting HTML to JSX: The Complete Guide for React Developers
Every transformation needed to convert HTML to valid JSX: className, htmlFor, style objects, self-closing tags, SVG attributes, an…
How to Minify HTML (and Why It Matters for Core Web Vitals)
Learn what HTML minification actually removes, how much page weight it saves, and how it affects LCP and Core Web Vitals. Includes…
chmod Calculator: Understand Linux File Permissions in Seconds
Use our free chmod calculator to convert between octal permissions and symbolic notation (rwx). Understand Linux file permissions …
SQL Formatter Online: Instantly Beautify SQL Queries in Your Browser
Format messy SQL queries online in one click. HTMLToolz SQL Formatter handles SELECT, INSERT, UPDATE, subqueries and CTEs — free…
How to Format HTML Online: The Fastest Way to Beautify Messy Code
Learn how to format and beautify HTML instantly online — no install needed. HTMLToolz formats minified or messy HTML in one clic…