Useful by design

One job.
Done well.

Fast calculators, converters and everyday utilities without accounts, clutter or unnecessary data collection.

🔒 Private by design — your tool input stays in your browser whenever possible

Featured

Popular WispData tools

Every tool is built for speed, mobile use and straightforward results.

Time Zone Converter

Compare cities, local times and UTC offsets on a visual world map.

Percentage Calculator

Calculate percentages, percentage change, increases, decreases and reverse percentages.

Universal Unit Converter

Convert length, mass, temperature, area, volume, speed, data and more.

QR Code Generator

Create static QR codes locally in your browser without sending the contents anywhere.

CM, Inches & Height Converter

Convert centimetres, inches and feet/inches with human-height formatting.

Random Wheel / Name Picker

Paste names or choices and spin a private random picker wheel.

Random Number Generator

Generate secure random integers or decimals in a range, with optional no-repeat mode.

Color Picker & Converter

Convert HEX, RGB and HSL colors and check contrast against black and white.

Age Calculator

Calculate exact age, next birthday and approximate days, weeks and months lived.

Word & Character Counter

Count words, characters, sentences, paragraphs and estimated reading time.

Date Difference Calculator

Find days between dates, add or subtract days and count business days.

KG to Pounds Converter

Convert kilograms to pounds and pounds to kilograms instantly.

Browse all 31 tools

No account requiredOpen a tool and use it immediately without registering.

Privacy-consciousInputs stay in your browser for browser-only tools unless a page clearly says otherwise.

Made for repeat usePermanent tool URLs, responsive layouts and concise explanations make pages easy to bookmark.

What is WispData?

WispData is a growing collection of focused online utilities for everyday calculations, unit conversions, random generation, text formatting and developer tasks. Instead of combining unrelated features into a complicated dashboard, each page is designed around one clear job.

Where a tool can work entirely in the browser, the calculation or transformation happens locally. That keeps the experience fast and means values such as text, measurements or generated passwords do not need to be uploaded just to get a result.

Learn more about WispData or browse the complete tool directory.