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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 Unit Converter — Length, Weight, Temperature, Speed

Convert between common units of length (m, ft, mi, km), weight (kg, lb, oz), temperature (°C, °F, K) and speed (km/h, mph, m/s) instantly. Useful for cooking, travel, science homework and engineering.

Features

How to use

  1. Step 1. Pick the category.
  2. Step 2. Choose from-unit and to-unit.
  3. Step 3. Type a value — result updates live.

Frequently Asked Questions

Why does temperature conversion not scale linearly?

Celsius and Fahrenheit have different zero points (0°C = 32°F), so the formula is °F = °C × 9/5 + 32, not a pure ratio.

Are these conversions exact?

Yes — we use international SI conversion factors (e.g. 1 inch = 25.4 mm exactly).

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