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ToolZone

Professional utilities running entirely in your browser. Fast, private, and 100% free — no signup, no tracking.

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Free Online Tools for Developers & Productivity

ToolZone is a curated collection of 20 free online tools for developers, designers, writers, and everyday productivity. Every tool runs entirely in your browser — no signup, no uploads, no tracking. Your data never leaves your device.

Format and validate JSON, generate strong passwords, encode and decode Base64 or URLs, test regular expressions, convert colors, build CSS gradients, calculate BMI or age, generate Lorem Ipsum, hash text with MD5 or SHA-256, and more — all from a single fast, private, dark-themed workspace.

Whether you're a developer needing quick utilities, a designer working with colors and gradients, or a writer counting words and characters, ToolZone gives you instant, ad-free access to professional-grade web tools that work offline once loaded.

Free BMI Calculator — Body Mass Index

Calculate your Body Mass Index (BMI) and find your WHO classification (underweight, normal, overweight, obese). BMI is a quick screening tool that estimates body-fat-related health risk from height and weight.

Features

How to use

  1. Step 1. Enter your height and weight.
  2. Step 2. Read your BMI and WHO category.

Frequently Asked Questions

Is BMI accurate for athletes?

BMI doesn't distinguish muscle from fat, so it overestimates body fat in muscular individuals. Pair it with waist circumference or body-fat percentage for a fuller picture.

What is a healthy BMI?

The WHO normal range is 18.5–24.9. Below 18.5 is underweight; 25–29.9 overweight; 30+ obese.