About
Tsinglin is a collection of browser-based tools and small games. It exists for a simple reason: the tool you need for one small task should not require an account, a download, or handing your file to a server you know nothing about.
This page explains who runs the site, how the tools work, and — because the privacy claim on every tool page is a specific one — exactly where its edges are.
Why this site exists
Most "free online tools" ask for more than the task deserves. You want to compress one image, format one JSON file or convert one document, and you are met with a signup wall, a pop-up, a download prompt, or an upload progress bar as your file leaves your machine for a server you cannot see.
Tsinglin is the opposite of that. Every tool opens and works immediately. There is no account, nothing to install, and no file is sent anywhere to be processed.
How the tools work
Each tool is a self-contained page that does its work in your browser, using the JavaScript and WebAssembly APIs your browser already has — text handling, arithmetic, the Canvas API for images, and WebAssembly modules served from this domain for heavier document and media work.
Because the work happens on your device, there is no round trip to a server to wait for, and nothing for us to store. We run no analytics, no tracking pixels and no advertising scripts, and we set no cookies.
What the privacy claim does not cover
The "runs in your browser" claim is precise, and it is worth knowing where its edges are. Three things do involve a third party. None of them sends your tool input to us, but each is described in full in the Privacy Policy:
- The media and document converters download their processing engines from public CDNs (unpkg and jsDelivr). Your file stays on your device, but those requests do reveal your IP address to the CDN.
- The multiplayer games use an account, stored with Supabase, so an opponent can know who they are playing. Eight games require one; the single-player games and every tool on the site do not.
- The site is served by Cloudflare, which handles every request, as any hosting provider must.
Who runs this
Tsinglin (Tsinglin Tools) is an independent project, not a company with a support department behind it. The tools are built and maintained as time allows, and things that are reported get fixed.
If you find a bug, a wrong result, or a page that reads badly, write to support@tsinglin.tech. Concrete reports are the main way this site improves, and they are genuinely welcome.
How the site stays free
Tsinglin is free to use, with no account and no paid tier. There are no ads on the site today, and no analytics or advertising scripts are loaded.
If that ever changes, the honest version of the promise is this: any advertising would be kept minimal and clearly separated from the tools, it would be disclosed on this page and in the Privacy Policy before it appeared, and it would never require an account or change what a tool does with what you enter.
What this site is not
Tsinglin is a set of calculators, converters and generators — not an advisory service. The financial and health tools apply standard public formulas; they do not know your circumstances, and they are not a substitute for a qualified professional. That limitation is set out in full on the Disclaimer page.