Privacy.

What happens in the browser

Convertors, calculators, QR codes, and PDF tools do their work in this tab. Numbers you type, files you add, and results you see stay on your device unless you copy them, download them, or share them yourself.

What we do not collect

There is no sign-in, and we do not run our own analytics. Files and calculations still stay on your device. Advertising is separate: we use Google AdSense to show ads, which is described below.

Cookies

A few first-party cookies remember a choice you made on this site. They are not used to identify you across the web.

• n1-theme — stores Daylight or Dark Mode after you pick it in the menu. Kept for one year.
• n1-split-limits and n1-combine-limits — remember whether the PDF splitter or merger is showing the compact size warning. Kept for one year.
• n1-probe — a brief test that cookies can be written, then deleted immediately.

Advertising

Pages load Google AdSense (Auto ads) so Google can place advertisements. Google may set cookies and use facts about the visit — typically the page address, the device, and the public text of the page — to choose ads, measure them, and limit how often you see the same one.

We do not upload your files, and we do not send the numbers you type to Google or to ourselves. The ad script still runs in the same tab as the tool, so we cannot promise it never sees what is on the screen. We do not use AdSense as a way to collect those details.

Google explains this in Google’s Privacy Policy and how Google uses information from sites that use their ads. If you are in the UK or EEA, Google’s ads message on the page (when it is enabled) is how you choose advertising cookies.

Email

If you write to feedback@numberone.app, that message is ordinary email. We use it to reply and to improve the tools. We do not sell addresses.

Links you choose

Share buttons (on About, and anywhere else we add them) only contact Facebook, X, LinkedIn, and similar services if you click them. Those sites then follow their own privacy rules.

Changes

If this description changes, we will update this page. Last updated 25 October 2026, to include Google AdSense.