Add a Watermark to PDF: Text or Image Watermarks
Add a text or image watermark to PDF pages in your browser. Choose size, colour, opacity, angle and position, or repeat it across each page.
Drop a PDF here or choose one
One PDF file. Encrypted (password-protected) PDFs are not supported.
Preview
Choose a PDF to see a preview of the first watermarked page.
Choose a PDF or drop it on the box above.
Notes
- A watermark marks a document as a draft, confidential or yours. It is a deterrent, not protection: anyone with PDF editing tools can remove, cover or crop it. If the content must stay confidential, control who receives the file.
- The watermark is drawn on top of the page content. Form fields, comments and other annotations are shown above it.
- Text that uses only Western European characters (as in English, French or German) is added as real text with a standard PDF font. Other text, such as Korean, Japanese, Chinese, Thai, Cyrillic or Vietnamese, is added as an image drawn with your device's fonts, so it cannot be selected or searched.
- Digital signatures in the PDF become invalid, because the file is changed. Encrypted (password-protected) PDFs are not supported.
- The preview is drawn by your browser and can differ slightly from the saved file. Check the downloaded PDF.
- Very large PDFs (over about 100 MB or several thousand pages) need a lot of memory and may fail on phones.
- The PDF is processed in your browser and is not uploaded to LeedyBox. PDF.js and pdf-lib are loaded from leedybox.com itself.
How to use
- Choose a PDF or drop it on the box. Encrypted PDFs cannot be used.
- Choose a text watermark (enter the text, font, size and colour) or an image watermark (choose a PNG, JPG or WebP image and its width).
- Set the opacity and the angle: horizontal, diagonal or a custom angle.
- Place it once per page in one of nine positions, or tile it across the page.
- Choose the pages, check the preview and press "Add watermark and download". Open the downloaded file to check it.
Frequently asked questions
Is my PDF uploaded to a server?
No. The PDF is read and changed in your browser with the pdf-lib library and is not uploaded to LeedyBox. Only the libraries themselves are downloaded, from leedybox.com itself.
Can a watermark stop people from copying my document?
No. A watermark is a visible label that discourages misuse and shows where a copy came from. Someone with a PDF editor can remove or cover it, crop it away or copy the text underneath. To keep a document confidential, limit who receives it.
Why can my Korean, Japanese or Russian watermark text not be selected?
The fonts that every PDF reader has built in only cover Western European characters. Embedding a font for other scripts would add several megabytes, so such text is drawn with your device's fonts at about 300 dpi and added as a transparent image. It looks like text but cannot be selected or searched.
Will the watermark appear upright on rotated or landscape pages?
Yes. Positions and angles are worked out from the page as it is displayed, including pages that are rotated in the PDF, so the watermark appears where you chose it. Check the preview and the downloaded file, especially for unusual documents.
Is there a limit on file size or number of pages?
There is no fixed limit, but the whole PDF is held in your device's memory. Files over about 100 MB or with thousands of pages may be slow or fail, especially on phones. Encrypted PDFs are not supported.