PDF tool · Free
Watermark PDF
Protect your PDF before sending it to a client — a text watermark and, optionally, a password.
100% in your browser — your PDF never leaves your device
Drop your PDF here or click to choose
PDF files only
A watermark identifies the owner and discourages misuse — it is not full protection: no PDF is safe from a screenshot, photo or determined editing.
Frequently asked questions
Is my PDF sent to a server?
No. The watermark is applied in your browser — the file never leaves your device.
Does a watermark fully protect the document?
No. It shows who the owner is and discourages misuse, but any PDF can be photographed or screenshotted. To lock opening, also check the password option.
Can I use my own text?
Yes. Type any text or pick one of the suggestions (CONFIDENTIAL, DRAFT, etc.).
Does the password use real encryption?
Yes, AES-128 — the same standard as the Protect PDF tool.