About
helio.tools is a catalogue of small utilities for people who work with data and text. There are currently 45 of them. Each is a single page that does one job precisely.
Where your input goes
Nowhere. Every tool is JavaScript running on the page in front of you, so what you paste is never uploaded, logged, or sent anywhere. You do not have to take that on trust: open your browser's network panel and watch it stay silent while you type, or disconnect from the network and keep using the tools.
Each tool remembers its last-used settings in local storage, on your own machine, so it opens the way you left it. A few fields are deliberately left out of that: a signing key, a token, a Wi-Fi password. Those are gone when the tab closes.
Nothing is written into the page URL as you type. Every tool has aCopy link button instead, and it is the only thing that produces a shareable link: press it and you get a URL carrying the settings and, where it fits, the input. That state rides after the#, which browsers never send to a server, so a link you share travels to the person you send it to and to nobody in between, this site included. Treat one the way you would treat the input that produced it.
The analytics, and the two cookies it sets
One thing on these pages can talk to a server, and it is not a tool. If you agree to it, the page loads Google Analytics, which counts the visit and records roughly where it came from. It is fetched once when the page is and never sees a keystroke, so it can tell that somebody opened the Base64 tool and nothing at all about what they encoded.
Saying no is not a setting that quietens it down. The request to Google is never made, its two cookies are never written, and any it wrote before you changed your mind are deleted. That answer lives in local storage on your machine, and the link at the bottom of every page brings the question back whenever you want to give a different one.
The full detail, including what Google receives, how long any of it lasts and how to have it removed, is on the privacy page.
Design
Output updates as you type. No submit buttons, no modal dialogs, no result screen to navigate to. Half-typed input counts as normal, not an error, so the last good output stays on screen, dimmed, with a short note saying what is missing.
Every output can be copied with one click, and every tool page carries a written explanation of what it computes, including the edge cases that usually go undocumented.
Accounts
There is nothing to sign up for today, and the free tools will never ask you to. Accounts are coming, but only as the way to pay for the premium ones: a small number of tools that take substantially more work to build and maintain, marked Premium in the catalogue. Everything currently listed is free.
An account will not change how any of this works. Premium tools run in your browser like the rest; signing in tells the site you may load them, it does not route your input through a server.
Contact
Corrections and tool suggestions are welcome at hello@helio.tools.