Done In Browser is a small, single-purpose website that hosts free utility tools for online sellers and other people who do small, repetitive tasks on the web. Each tool solves one specific problem really well, runs entirely in your browser, and never asks you to sign up.
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" that you need just to remove a $20-per-month upsell.
Meanwhile, the actual problems sellers face every day — calculating real profit after fees, fixing a messy supplier CSV, formatting a description that Etsy won't mangle — are usually small enough to solve with a few hundred lines of JavaScript. There's no reason they should require a paid app or a signup.
So this site exists to be the version that's actually free. Each tool is a single HTML page that runs in your browser. Nothing gets uploaded to any server. There's no account. There's no email capture. You open the page, use the tool, close the tab. That's it.
All four current tools — the Etsy fee calculator, the Etsy offsite ads calculator, the Etsy description formatter, and the Shopify CSV cleaner — are built as static HTML pages with embedded JavaScript. When you visit a tool page, your browser downloads the HTML once and then everything you do happens locally.
The CSV cleaner uses the browser's File API to read your CSV directly from your device — your file never touches our servers. The calculators do their math in JavaScript using inputs you type. The formatter manipulates your text in memory. You can verify all of this yourself by opening your browser's developer tools (Network tab) and watching while you use the tools — there will be no outbound requests carrying your data.
Each tool solves exactly one problem. We'd rather build 20 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. Read the privacy policy for the full breakdown.
No "Submit" buttons. Results update instantly as you adjust inputs, so you can experiment with different scenarios without waiting.
Calculators use the actual published fee schedules from Etsy, Shopify, and other platforms — verified at build time and updated when the platforms change. Where we explain how something works, we cite the official source.
If you've spotted a bug, a calculation that disagrees with your real Etsy or Shopify dashboard, or a tool you wish existed — feedback is genuinely welcome. Reach us at [email protected].
Done In Browser is an independent project. The site is hosted on Cloudflare Pages.
We're not affiliated with Etsy, Shopify, or any other platform mentioned on the site. We mention them by name only because that's what the tools work with. Etsy® is a trademark of Etsy, Inc. Shopify® is a trademark of Shopify Inc.