Short answer
Open Sign & Watermark and add the PDF you want to mark. Choose text or an image.
Place the mark in the preview, choose which pages receive it, and save a new PDF. Open the new file before sharing it.
What a watermark does
A watermark is a visible text or image mark placed in front of or behind page content. It can communicate status, ownership or handling instructions. It is not access control, redaction, a certificate-based digital signature or proof that copying is impossible.
Before you start
- Keep the source PDF and decide which pages need the mark.
- Use wording such as DRAFT or SAMPLE that accurately describes the document.
- Use an image without personal information unless that information is intentionally part of the mark.
- Choose a layer and opacity that remain readable without hiding important content.
Add and preview the watermark
Add the PDF copy
Open Sign & Watermark and select the local source.
You should see: the correct filename and a page preview.
Create the mark
Enter text or choose an image, then set page range, placement, scale, rotation, opacity and front or back layer.
You should see: the mark in the preview at the chosen size and position.
Review the preview
Inspect a page with dense text, a page with images and the first and last selected pages.
You should see: the mark only on selected pages, without hiding important content.
Save separately
Create a new file and open it in another reader at normal zoom.
You should see: a new PDF while the original remains unchanged.
Check every affected page type
- The mark appears only on the intended pages.
- Text, forms, signatures and important graphics remain usable.
- The mark is legible on light and dark page areas.
- The filename makes the marked copy easy to distinguish.
Limits and signing caution
If the mark seems missing, check the selected page range, layer, opacity, and scale in the preview. A mark behind the page can be hidden by an opaque background.
A watermark is a visible page change. It does not prevent removal by a determined editor and does not prove identity or tamper evidence. Adding it can also make an existing certificate signature show that the document changed. Return to the unchanged source if a recipient requires a certified signing workflow or a document without modifications.
Osenpa PDF Tools
Preview visible text and image marks on selected PDF pages and create separate local output.