What Is a PDF Watermark?
A watermark is a semi-transparent text overlay that appears on every page of a PDF. Common uses include marking documents as DRAFT, CONFIDENTIAL, COPY, or SAMPLE — signalling the document's status at a glance. Watermarks can also include ownership info like a company name or URL.
How to Add a Watermark in Your Browser
You don't need Adobe Acrobat to watermark a PDF. Our browser-based Watermark PDF tool lets you configure everything without uploading your file anywhere:
- Open your PDF in the Watermark tool
- Type your watermark text (e.g. CONFIDENTIAL, DRAFT, or your company name)
- Set the font size, opacity (30–50% is typical), rotation angle (45° is classic), and colour
- Click Apply and download the watermarked PDF
Diagonal vs Horizontal Watermarks
The classic diagonal watermark (45° angle) is harder to ignore and more resistant to being cropped out. Horizontal watermarks work better when the text is long or when you want it to appear in a specific corner of the page. Our tool lets you set any angle from 0° to 90°.
Opacity: How Visible Should It Be?
Too opaque and the watermark obscures the content; too light and it's easy to miss. For most documents, 25–40% opacity strikes the right balance — clearly visible on screen and in print but not interfering with readability. If you're watermarking for archiving or internal distribution, 20% is usually enough.
Can You Remove a Watermark Later?
Watermarks added with our tool are embedded as page content. They can be covered using the Redact tool (draw a white rectangle over the watermark area) — but this is not a clean removal. For archival purposes always keep the original non-watermarked version. If you need truly removable watermarks, consider using invisible metadata instead.