Toolfrnd Blog
Short, practical guides that explain the formulas and concepts behind our tools. Written by the Toolfrnd editors.
SIP vs Lump Sum: Which Is Better in 2026?
The classic monthly SIP vs single-shot lump sum debate, with the math, the behavioural angle and a decision table so you can pick quickly.
How to Calculate BMI Correctly: Complete Guide 2026
The BMI formula, the WHO categories, limitations for muscular or elderly bodies, and the better metrics that replace or complement BMI in 2026.
JWT Explained: How JSON Web Tokens Actually Work
The three parts of a JWT, the signing algorithms, common pitfalls like alg:none, and when a stateless token is the wrong choice.
Base64 Explained: Why Developers Use It Everywhere
Where Base64 came from, how the 33 percent overhead works, URL-safe vs standard, and why you should never use it as encryption.