PDF Watermark
Add a text or image watermark to PDF pages — choose position, opacity, and which pages, all in your browser.
What is PDF Watermark?
Watermarking a PDF means stamping a faint text or image — such as "CONFIDENTIAL", "DRAFT", or a company logo — over one or more pages of the document, so that anyone reading or printing it sees the mark in place. The watermark sits as a semi-transparent layer on top of the page's existing text and graphics: it doesn't replace the content, it identifies the document's status or owner. PDF watermarks are commonly used to mark drafts, indicate sensitivity, deter unauthorized copying, or brand client-facing files. Because the watermark is drawn directly into the page content stream, it travels with the PDF wherever the file goes — it can't be removed by simply renaming the file or opening it elsewhere.
How to Use PDF Watermark
- Drop a PDF onto the upload zone (or click it to pick one). You can watermark a single file at a time.
- Type the watermark text and/or upload a PNG/JPG image to use as a logo stamp. At least one of the two is required.
- Adjust opacity (how see-through the mark is), font size, and color using the sliders and color picker.
- Choose a position — diagonal across the page, centered, tiled in a repeating grid, or pinned to the bottom-right corner.
- Pick whether to stamp every page or just the first, then click "Add watermark". A live preview appears below; use "Download" to save the result.
Examples
Confidential draft
Input: report.pdf (12 pages) + text "CONFIDENTIAL", diagonal, 30% opacity, all pages
Output: report-watermarked.pdf with a faint diagonal stamp on every page
Logo corner stamp
Input: invoice.pdf (1 page) + logo.png, bottom-right, 50% opacity, first page only
Output: invoice-watermarked.pdf with a semi-transparent logo in the corner
Sample tile
Input: catalogue.pdf + text "SAMPLE", tile position, 20% opacity
Output: catalogue-watermarked.pdf with the word SAMPLE repeated across each page
Common Mistakes
- Setting the opacity too high (80–100%) so the watermark obscures the underlying text and makes the PDF hard to read — 20–40% is usually the sweet spot.
- Choosing a font size that's far too large for the page, pushing the watermark off the edges. Preview the result before downloading.
- Expecting the watermark to act as copy-protection — it identifies and deters, but it isn't DRM and can theoretically be removed by a determined editor.
- Trying to watermark an encrypted PDF without removing the password first — the tool will return a load error.
Why Use This Tool
- Runs fully client-side — no uploads, no server round-trips, your files stay on your device.
- Supports both text and image watermarks, alone or together on the same stamp.
- Flexible placement — diagonal, centered, tiled, or corner — with adjustable opacity, size, and color.
- Live in-browser preview so you can tweak settings before downloading.