Stamp text such as "COPY – for visa application only" across a photo or document scan, so a copy cannot easily be reused. Nothing is uploaded.
A watermark makes casual reuse harder but does not stop a determined person, and it cannot be undone from the saved copy, so keep your original. Some official uploads reject marked documents; check the requirements first. Output is JPG at high quality, or PNG if the source is PNG.
Are my images uploaded? No. The mark is drawn in your browser.
Will the watermark hide my text? Use a lower opacity or fewer repeats; the tiled layout is designed to keep the document legible.
Does it work on PDFs? Not directly. Convert pages with PDF to JPG, mark them, then join them with Images to PDF.
Informational tool, not legal or tax advice.