About emonster.tools

Why we built emonster.tools

We build software for clients and our own projects. Along the way, we need QR codes, favicons, image conversions and quick calculations. Sometimes a search for a simple utility led to an unfamiliar site asking for an email address before we could finish. We wanted a more straightforward way to work. The library began with tasks we encountered ourselves and grew to cover other practical needs.

A practical collection

Use the library for everyday conversions, dates, money scenarios, image tasks and specialist calculations. Search by the task you need to complete, or browse categories. Each tool keeps its own inputs, examples, method and limits close to the result.

Free Calculators and Tools

Processing and privacy

The calculation or transformation runs in your browser. The tool does not send its input values or generated output to an application server. Loading a page still makes infrastructure requests; optional analytics and Google consent messages have separate controls.

Privacy Policy. Privacy & preferences in the footer controls optional analytics.

How we build and check the tools

Inputs, units, formulas and limits belong together. We check examples and representative valid and invalid inputs, and explain when results depend on external data or your device.

Read our methodology · Frequently asked questions · Report a problem to emonster