Watermark PDF Online Free
Stamp your name, brand or a word like CONFIDENTIAL across every page of a PDF. Choose the position, size and opacity — the watermark is added right in your browser.
No file chosen yet. Your file is processed locally and never uploaded.
12 to 120 points. Larger text is more visible across the page.
Lower opacity is a faint background mark; higher opacity is bold and hard to miss.
Watermarked PDF ready
How to use
- Choose a PDF file using the drop area or the file picker.
- Type your watermark text, then pick a position, text size and opacity.
- Click Add watermark, then download the watermarked.pdf file.
Frequently asked questions
Is my PDF uploaded to a server?
No. Watermarking runs entirely in your browser with the pdf-lib library, so your document never leaves your device.
Which pages get the watermark?
Every page. The same watermark text is stamped on all pages of the PDF, in the position, size and opacity you choose.
Will the watermark cover my document's text?
It sits on top of the page, so very high opacity or a very large size can make the page harder to read. The default 0.3 opacity keeps it faint — raise it only if you want the mark to stand out.
Can I remove a watermark later?
Not with this tool — the watermark becomes part of the PDF when it is saved. Keep a copy of your original PDF if you might need the clean version. Use it as a free watermark pdf online — no signup, nothing to install.
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