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ToolZone

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Free Online Tools for Developers & Productivity

ToolZone is a curated collection of 28 free online tools for developers, designers, writers, and everyday productivity. Every tool runs entirely in your browser — no signup, no uploads. Your tool input 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, low-clutter access to professional-grade web tools that work offline once loaded.

Free Percentage Calculator

Calculate common percentage questions in seconds: what is a percentage of a number, how much a value increased, and how much it decreased. Useful for school work, business reports, shopping, finance, dashboards and quick mental-math checks.

Features

How to use

  1. Step 1. Enter the percent and base number to calculate X% of Y.
  2. Step 2. Enter a starting and ending value to calculate the percentage change.
  3. Step 3. Copy or use the result in your report, spreadsheet or calculation.

Frequently Asked Questions

How do you calculate X percent of Y?

Convert the percent to a decimal and multiply: 20% of 150 is 0.20 × 150 = 30.

How is percentage change calculated?

Percentage change is (new value - old value) divided by the absolute old value, then multiplied by 100.

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Guides worth reading

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