TL;DR: We receive or collect no information from you, and we don't store anything on your PC.
This website uses no cookies or other kinds of client-side storage (unless you manually download a file). Some temporary data still may be written to your disk by your browser as cache. All processing happens locally. No images are transferred via this page to any other computer, not even servers hosting the site. You can verify this by opening a network analyzer, you probably have one built into your desktop browser (try Ctrl+Shift+E). If this website is hosted on GitHub, their Terms of Service may apply, and they may collect metadata of your request for this site, such as your IP address or what files you accessed and when. You may download this page instead as a single HTML file by right-clicking this link (not implemented yet) and choosing "Save as..." for offline use.
This website is licensed under GPLv3. The source code is available here (not implemented yet).