Short version: your PDF stays on your device.
Tall PDF Slicer reads your PDF and builds the new one inside your browser. Your file is not uploaded, sent to a server or kept by this site. When you close or refresh the page, it is gone from the page.
The page remembers a few settings in your browser so you do not have to pick them again: the page size you chose, Automatic or Manual mode, and the zoom level. This stays on your device and is not sent anywhere. This site does not set cookies of its own.
When your browser loads these, those services can see ordinary request details such as your IP address and browser type, as with any website. They never receive your PDF.
At the moment this site has no analytics and shows no ads. If that changes, this page will be updated first to say what is used and how you can opt out.
The Contact form sends us your message, the topic you chose, and your email address only if you type one in. We use it to read and reply to you, and we do not share it or add it to any list. The message is delivered by a third-party form service. Please do not put anything private in it, and never include the contents of your PDF.