© 2026 FreeTool.tech
Learn how to deploy servers, design security keys, configure web tools, and optimize your daily development workflows.
Learn all about Base64 encoding and decoding. Understand how it works step-by-step, when to use it, URL-safe Base64 (Base64URL), and its main limitations.
Learn what Basal Metabolic Rate (BMR) is, how to calculate it using standard equations like Mifflin-St Jeor, and how it impacts weight management.
A plain-English guide to understanding HEX, RGB, and HSL color formats, how they compare, and how to use them with CSS Custom Properties.
Learn how to generate custom static and dynamic QR codes for URLs, WiFi passwords, and vCards without paywalls or subscriptions.
A complete beginner guide to JSON syntax rules, data types, usage in APIs, and how to format and validate JSON documents online for free.
A comprehensive guide to HTML character encoding, defining metacharsets, encoding online forms, and best practices for developer safety.
