AI Tools
Estimate prompt size, token usage and context needs for modern AI workflows.
100% Free Online Tools
Free tools that make life easier
A growing collection of free online calculators, AI tools, converters and utilities for everyday tasks, students, professionals and developers.
No signup required
Works in your browser
Fast & easy to use
Fast
Open a tool and get the result instantly.
Privacy-aware
Many tools run locally in your browser.
No account
Free tools without signup or friction.
Practical
Built around common everyday problems.
Popular tools
Calculators
Everyday calculations for money, percentages, time and more.
Converters
Convert units, shoe sizes, distances and common values in just a few clicks.
Generators
Generate secure passwords, QR codes and practical outputs.
Text & Data
Work with text, URLs, JSON and encoded data more efficiently.
Helpful guides
Learn the everyday calculations, conversions and practical rules behind the tools.
👟
Shoe Size Conversion Guide
International shoe size guide with conversion charts, foot measuring tips and kids sizing explained.
%Percentage Explained
Learn formulas, examples and common percentage mistakes.
↓Can Something Decrease More Than 100%?
Understand percentage decrease limits, edge cases and common wording mistakes.
🌍Metric vs Imperial Units
Understand units, conversions and why measurement mistakes matter.
🍽️Tipping Culture Guide
Learn how tipping works in the US, Europe and Asia.
Why use UtilTools?
UtilTools is built to be simple, fast and reliable. Whether you need to calculate, convert, generate, estimate AI token usage or format something, the tools are here to save you time.
- Free to use
- Works on all devices
- No installation needed
- Many tools run locally
- Helpful examples and guides
Frequently asked questions
Are UtilTools really free to use?
Yes. The tools are free to use and do not require an account.
Do you store the data I enter?
Many tools process values locally in your browser. See the privacy policy for details.
Do I need an account?
No. UtilTools is designed to work without signup or login.
Can I use the tools on my phone?
Yes. The tools are designed for desktop, tablet and mobile devices.