Last updated: October 2026.

Three facts cover almost everything this page could say:

1. There is no upload. ResCal has no image processing, no file picker, no form — the scaler only does arithmetic on numbers shown on screen.
2. The arithmetic is local. Width, height, box sizes and percentages are read and computed by JavaScript running in your tab. No fetch, beacon or websocket carries them anywhere — you can sever the network after load and every mode keeps working.
3. Nothing is written down. The site sets no first-party cookies and touches no localStorage, sessionStorage or IndexedDB. Refresh the page and it starts clean, because nothing was ever saved.

What your browser does send

Requests for the pages themselves go through Cloudflare, which — like any host — necessarily sees standard request metadata: your IP address, the URL, a timestamp, your browser’s user-agent string. That metadata delivers the response and filters abuse. Since the site has no accounts and no user records, there is nothing on our side for those logs to attach to.

Where third parties come in

Ad slots, when shown, are served by networks such as Google AdSense. They may set their own cookies or device identifiers to count impressions and — where permitted — personalize what appears. The controls are yours: Google’s ad settings or any content-blocking setup works, and the scaler is unaffected either way. The numbers you type are never in an ad request — they aren’t on the network to be captured.

Changes and questions

If this policy changes, the revision appears here under a new date. Anything unclear: hello@nxtolerance.com.