PDF Watermark
Overlay a line of diagonal text on every page, such as "For internal use only" or "CONFIDENTIAL".
Drag in a PDF, or Choose file
Processed locally · No uploadWhy English only
PDF's standard fonts (Helvetica) contain no Chinese glyphs. Writing Chinese requires embedding a Chinese font file (several MB), which would balloon the output size — so this is limited to English letters and digits.The watermark is overlaid on the page, so anyone with an editing tool can remove it, it only guards against accidental sharing, not deliberate tampering.