Watermark PDF
Stamp text across every page. Runs in your browser — nothing is uploaded.
About Watermark
Watermark PDF stamps text diagonally across every page of your document — DRAFT, CONFIDENTIAL, a company name, or anything else you type. You control the size, angle and transparency so the mark is unmistakable without making the text underneath hard to read. Free, and nothing is uploaded.
Watermarks exist to stop documents being mistaken for something they are not. An unmarked draft contract circulating internally will eventually be treated as final by someone who did not read the covering email, and an unmarked internal memo forwarded outside the company carries no clue that it was never meant to travel. A word stamped across every page makes the document's status travel with it, which no email footer or filename can do.
The other common use is deterrence rather than status. Photographers watermark proofs, agencies watermark concept work before a client has paid, and consultants watermark sample reports. The mark does not make copying impossible — nothing can — but it makes casual reuse obvious, which is usually enough. The judgement to get right is opacity: too faint and it can be cropped or ignored, too strong and your reader cannot actually read the document.
How to Watermark
- Select the PDF you want to mark.
- Type your watermark text, such as DRAFT or CONFIDENTIAL.
- Set the font size and rotation — a diagonal angle covers more of the page and is harder to crop out.
- Adjust the opacity until the mark is clearly visible but the underlying text stays readable.
- Download the watermarked PDF.
Tips & common problems
Around 20-30% opacity is the sweet spot
Below that the mark is easy to overlook; above it the document becomes tiring to read. Check a text-heavy page rather than the cover before deciding.
Diagonal is harder to remove
A horizontal band across the middle can be cropped away. A rotated mark spanning corner to corner cannot be cropped without destroying the page.
Keep an unwatermarked master
The watermark is written permanently into the downloaded file. Always keep the clean original, because there is no removing the mark later.
Watermark last
Apply it after merging, reordering and compressing. Pages added afterwards will not carry the mark, which is exactly the inconsistency that makes people doubt a document.
Frequently asked questions
How do I add a watermark to a PDF for free?
Type your text, adjust the style and download. No signup, and nothing is uploaded — the whole thing happens in your browser.
Can I change the opacity and angle?
Yes. Text, font size, rotation angle and transparency are all adjustable, so you can tune the mark for readability before downloading.
Will the watermark appear on every page?
Yes, it is applied across the whole document so no page can be extracted and passed off as unmarked.
Can the watermark be removed afterwards?
Not easily, which is the point. It is drawn into the page content rather than added as a removable layer, so keep an unwatermarked copy of your original for your own use.
Can I use an image or logo instead of text?
This tool applies text watermarks. To place a logo, open the document in Edit PDF and add the image to your pages.
Does watermarking affect the file size or quality?
Barely. The text is drawn as vector content, so it adds a negligible amount to the file and stays sharp at any zoom level.