What this site is
Stacklane is a set of small browser tools: 73 single-purpose utilities and 7 calculators for people running a service business. Every one of them runs on your device.
How the tools work
Each page is a plain HTML file with its own CSS and JavaScript. When you open a page, your browser downloads those files once and then does the work locally — counting words, converting a unit, compressing an image, adding up an invoice. There is no application server behind the site and no endpoint that accepts your input, so there is nothing to upload to and nothing to store.
What it does not do
- No accounts, no signup, no login.
- No cookies, no analytics, no tracking pixels, no third-party scripts.
- No uploads: text you paste and files you choose are read by your own browser.
- No payment, no subscription, no paid tier.
What your browser keeps
Two pages save a draft on your device so a refresh does not erase your work: the invoice generator and the website audit checklist. That data stays in your browser's local storage, is never sent anywhere, and the invoice draft expires after seven days. The privacy policy sets this out in full.
How it is built
Static files, no framework and no build step for the published pages. Styles come from one stylesheet, icons are inline SVG, and the two libraries the PDF and QR tools need (pdf-lib and qrcode) are served from this site rather than a CDN. The pages load no font, image or script from another origin, which is why a tool page makes no request to any other site.
Limits worth knowing
The calculators do arithmetic on the numbers you enter. They do not know your lender's fees, your tax rules, your contract terms or your own costs, and they are not financial, legal or medical advice. Each tool states its own assumptions, and the terms of use ask you to check any figure before you rely on it.
Advertising
The pages contain reserved spaces for advertising, and those spaces are switched off: they take no space on screen and no ad code is loaded. If advertising is ever switched on, the privacy policy will describe it before that happens.