Done In Browser hosts 165 free utility tools — calculators, converters, generators and reference charts — that run entirely in your browser. Each one solves a single specific problem, loads as one self-contained page, and never asks you to sign up for anything.
The collection grew outward from a handful of seller-fee calculators into the working-numbers problems people look up repeatedly. As of this update it covers:
Category hubs at Concrete & Masonry, Solar & Off-Grid Power, Plumbing & Water Systems, Landscaping, Developer Tools, Text Tools and Minecraft group them, and the homepage lists everything.
Most “free” tool sites online aren't really free. They're funnels for paid SaaS products: enter your email to use the calculator, then get marketing for the next six months. Or they're hidden behind a “premium plan” you need just to remove a $20-per-month upsell.
Meanwhile the actual problems — how many yards of concrete for this slab, what gauge wire over this run, what order to apply these enchantments — are usually small enough to solve with a few hundred lines of JavaScript and a table of published figures. There's no reason they should require an account or a subscription.
So this site is the version that's actually free. You open the page, use the tool, close the tab. It's funded by advertising, which is why the cookie banner exists and why the privacy policy spells out exactly what advertising loads and when.
Every tool is a static HTML page with embedded JavaScript. Your browser downloads the page once, and from then on everything the tool does happens locally: the calculators do their arithmetic on the values you type, the text tools manipulate strings in memory, and the file-reading tools use the browser's File API to read from your device directly. No input you give a tool is ever transmitted anywhere — there is no server to transmit it to. This site has no backend, no database, and no account system.
To be precise about what you would see if you checked, because an earlier version of this page overstated it: open your browser's developer tools, go to the Network tab, and use any tool. You will see the page itself load. If you have accepted on the cookie banner you will also see requests to Google for advertising and for Google Analytics — those are third-party scripts, they are loaded only after consent, and they are described in full in the privacy policy. What you will not see is a request carrying the numbers, text or files you put into a tool. That is the claim, and it holds.
Each tool solves exactly one problem. We'd rather build 165 small tools than one bloated all-in-one platform.
You should be able to land on any tool page and start using it immediately. No accounts, no email, no “free trial that becomes a subscription.”
Tools run locally in your browser. We don't collect, store, or transmit the data you enter into them. Advertising and analytics are separate third-party scripts that load only if you accept — the privacy policy has the full breakdown.
No “Submit” buttons. Results update instantly as you adjust inputs, so you can experiment with different scenarios without waiting.
Each tool page states the formula it applies and the reference figures behind it. Game-mechanic pages cite minecraft.wiki; engineering pages name the standard or definition each figure comes from. Pages carry the date they were last verified, so you can see how current a number is.
If you've spotted a bug, a result that disagrees with the standard it cites, or a tool you wish existed, feedback is genuinely welcome — corrections to data and formulas especially. The contact page explains what's useful to include.
Done In Browser is an independent, one-person project. The fastest way to reach the operator is the contact page.
It is not affiliated with, endorsed by, or sponsored by any platform, game, manufacturer or standards body referenced on it; product and platform names are used only to describe what a given tool works with, and remain the trademarks of their respective owners.