Watermark PDF

1. Select a PDF from your device.
2. Type the watermark text, or choose a logo image. Adjust the size, opacity, rotation, and position while watching the preview.
3. Choose all pages or a page range such as 1-3, 5.
4. Press Add watermark and download. Your original file is not changed.

• The preview is drawn in your browser with pdf.js, and the watermark is laid out with the same placement code that writes the final file, so the result closely matches what you see.
• The mark is added to each chosen page with the pdf-lib library as a new layer on top of the page; the existing page content is kept as it is.
• Text uses the PDF standard Helvetica font. Logos are embedded as JPEG or PNG; transparent PNGs keep their transparency.
• Pages that are stored rotated are handled so the watermark appears the right way up for the viewer. Opacity is applied with a PDF transparency setting.

• Standard PDF files
• Max 25 MB
• Max 200 pages
• Logo images: JPEG, PNG, or WebP up to 20 MB

• A watermark is a visible mark added on top of the pages. PDF editing software can remove it, so it discourages reuse but does not protect a document or prove ownership.
• Text watermarks use a built-in font that covers letters, numbers and punctuation of Western European languages. For other scripts such as Arabic, Chinese, or Cyrillic, use an image watermark.
• Password-protected and digitally signed PDFs are refused: adding a mark would invalidate a signature.
• The preview is approximate; check the downloaded file. Tiled watermarks are limited to a sensible number of copies per page.
• This tool only adds watermarks. It does not remove them.

This tool runs in local-only mode. Your text or files are processed in your browser and are not uploaded to our servers for this feature. Keep originals on your device; downloads create a separate copy.

Is my PDF uploaded?

No. The PDF and any logo you choose are read and processed in your browser. Nothing is sent to our servers.

Can someone remove the watermark?

Yes, with PDF editing software. A watermark makes reuse more obvious but cannot stop it. For sensitive documents, share them through access-controlled channels instead.

Why can't I use my language's letters?

PDF's built-in fonts only cover Western European characters. For other scripts, put your text in an image (for example a transparent PNG) and use the image watermark option.

What opacity should I use?

Around 20% to 30% keeps the page readable while the mark is still clearly visible. Use a higher value for small corner marks.