About tools4.website

How the tools work

Every tool runs in your browser. What you type, paste or drop (numbers, texts, images, tokens) is processed on your device and is not sent to our servers. Most tools keep working even if you go offline after the page has loaded.

The numbers you enter appear in the page address so you can bookmark or share a result. Long texts and files are never put there.

Explained, not just solved

Each tool shows the formula it uses and a worked example, so you can check the result and understand where it comes from. We test every tool against those examples before it goes live.

No sign-up, no ads

There are no accounts and no ad trackers. We count visits with our own privacy-friendly analytics; the details are in the privacy policy.

Missing a tool?

Tell us with the suggestion form. New tools are added every week.

Health and money tools

Calculators for health, loans or retirement give estimates from standard formulas. They are not medical or financial advice; for decisions that matter, talk to a professional.