Tool Vio is a small collection of free online tools, built and run independently.
The idea is simple: the web is full of small jobs — generating a password, converting a file, checking a colour's contrast, working out a percentage — and each deserves a tool that does just that job, honestly, without demanding an account or an upload first. Every tool here runs entirely in your browser. That is not a slogan; it is the architecture. There is no server endpoint for your data to travel to, because there is no server doing the work.
What you will find here
Twenty-five tools across six categories: security, images, colour, data, text and calculators. Each tool page pairs the working tool with a plain-language explanation of what it does, its limits, and answers to common questions. The blog goes deeper on the ideas behind everyday calculations.
How the site is funded
Tool Vio is free and will stay free. Running costs are covered by advertising, clearly separated from the tools themselves. Advertising never changes what a tool computes.
Contact
Tool requests, bug reports and corrections are genuinely welcome at toolvio@gmail.com. The collection grows by request.
Last updated: October 2026.