Does the watermark affect the original text or content?
No. The watermark is a semi-transparent layer added on top of each page — it doesn't modify or remove any text or images in the original PDF, which stays fully visible and selectable.
Can the watermark be removed?
A watermark is a deterrent, not an unbreakable protection — it lowers the odds of a document being misused or redistributed, but a determined person could still crop or erase it. Tiled mode (the watermark repeated across the whole page) is harder to simply crop out than a single centered watermark.
Does it support Chinese text?
Yes. The watermark text is rendered as an image in your browser using the system font stack first, then placed onto the PDF — Chinese, English, or any other script displays correctly without needing to install extra fonts.
Are my PDFs uploaded to a server?
No. Watermarking runs entirely in your browser — file content is never sent to any server, and nothing is kept once you close the page.