Does the STL checker upload my model?

No. Parsing happens in a Web Worker on the same page. You can load a file, disconnect from the network, and the analysis still completes.

Do you use cookies for preferences?

No cookies at all. Your currency choice is stored in the URL, not in a cookie.

Will you add analytics later?

If it ever happens it will be cookieless, disclosed on this page first, and never applied to file contents. The current build has none.

Privacy

Nothing you type or drop here is sent anywhere

This site is a set of static files. There is no application server, no database, no analytics and no third-party code. That is a technical fact you can verify in your browser's network panel, not a promise in a policy.

What is collected

Data	Collected?	Detail
Calculator inputs	No	They live in the page and in the URL you are looking at. They are never transmitted.
STL files	No	Read with the browser File API, parsed in a Web Worker in the same tab, then discarded. There is no upload endpoint.
Cookies	No	None are set — not for preferences, not for measurement, not for anything.
Analytics	No	No Google Analytics, no Plausible, no self-hosted counter, no pixel.
Third-party scripts	No	No fonts, no CDNs, no ads, no social widgets. Every request goes to this domain.
Accounts	No	There is nothing to sign up to.

What the hosting layer sees

Like every website, the servers that deliver these files see the request: the page you asked for, your IP address, your browser's user-agent and the time. The site is designed to be hosted on a static platform (Cloudflare Pages), which keeps standard request logs for security and abuse purposes. Those logs are the host's, not ours; we do not build profiles from them and there is no code on the page that reports anything back.

If you want to confirm the file-handling claim, open your browser's developer tools, switch to the Network tab, and drop an STL on the checker. No request appears.

Sharing links

Calculator inputs are written into the URL as you type — for example /3d-printing-cost-calculator/?volume=120&material=pla. That is how a calculation becomes shareable without a server. Treat a shared link the way you would treat any URL: it contains your numbers, including any price you typed.

Advertising

There are no ad scripts on this site. ads.txt exists and authorises no sellers, which means no advertising system is permitted to sell inventory here. If that ever changes, this page will be updated first and the change will not be silent.

Contact

Questions about this policy: [email protected]. There is no tracking to delete, because none was ever created.

Last updated 2026-10-23.