What stays on this device
The browser reads the PDF, image, or office file you choose. Merge, split, convert, compress, mark, encrypt, decrypt, sign, and redact do not send the file contents to the Ready2PDF server. You download the result and keep it. Closing the page releases the in-memory copy.
Requests that do leave the device
Opening the site requests HTML, scripts, and styles from the host. Access logs usually include IP address, time, and URL, not PDF contents. This site does not set an account cookie.
Page visits are counted with 51.LA. The counter can see which page was opened. It does not receive your PDF.
OCR downloads language data from a public network. A selectable Chinese text layer also downloads an open-source font. That download is language data and a font, not your PDF uploaded to Ready2PDF.
Passwords
A password is used only for that one lock or unlock. The site does not store it. Encryption needs the browser’s crypto API, so the page must be opened over HTTPS. There is no password guessing.