Marking shared documents with labels like 'Confidential', 'Do Not Copy', or your company name discourages unauthorized distribution and makes the source of a file clear. It's especially useful for materials sent out for review, such as quotes, proposals, and design drafts. This tool stamps a semi-transparent text watermark onto every page of a PDF in a single pass.
Unlike many watermark tools that handle English only, this one converts your text into an image, so any script — including Korean, accented characters, and special symbols — stays intact instead of breaking. You can set the color with a color picker, the tilt from 0 to 90 degrees, and the opacity from 5 to 100 percent, so the mark stays clearly visible without covering the body text.
The watermark you type is repeated across the whole page, so even a cropped screenshot still shows the mark. Everything is processed inside your browser and your document is never sent to a server, so you can use it with confidence even for internal, confidential material.
How to Use
- 1
Select a PDF
Add the PDF you want to watermark. Files up to 200MB are supported.
- 2
Enter the text
Type the text to stamp, such as 'Confidential' or your company name. Any language works.
- 3
Adjust the style
Set the color, tilt (0–90°), and opacity (5–100%). An opacity of 20–30% and a 45° tilt usually look natural.
- 4
Run & download
Click 'Add watermark' and download the result.
When It's Useful
Protect review drafts
Stamp 'Draft' or 'For Review' on design drafts and proposals sent to clients to separate them from the final version and prevent unauthorized use.
Mark internal confidential documents
Stamp 'Confidential' or 'Do Not Copy' on materials that must not leave the company, making accountability clear if they leak.
Brand with company name and source
Add your company name semi-transparently across every page of a report or handbook to mark the brand and source consistently.
Flag drafts and expiry
Mark a status like 'DRAFT' or 'EXPIRED' across the whole document to prevent misuse of outdated versions.
Tips
- Setting the opacity too high hurts readability of the body text, so 20–30% is recommended.
- A diagonal (45°) placement is the hardest to crop out and best discourages unauthorized screenshots.
- Use a light color on dark documents, and red or gray on light documents, for good visibility.
- Long text shrinks the letters and can look faint, so keep it short and focused on key words.
- Once added, the watermark merges with the body and is hard to undo, so always keep a separate copy of the original.
- The watermark applies the same way to image-based PDFs, such as scanned pages.
FAQ
Does it work with non-English text?
Yes. The text is converted into an image before it's inserted, so Korean, special characters, and even emoji stay intact.
Can I remove the watermark later?
Once added, it merges with the original and can't be removed easily. Keep a separate copy of the original file.
Can I add an image logo?
Currently text watermarks are supported. If you need a logo, you can place an image with the 'Sign PDF' tool.
Can I apply it to specific pages only?
It goes onto every page the same way. If you need only some pages, separate them with 'Extract Pages', apply the watermark, then merge them back.
How far can I adjust the color and tilt?
Color is fully adjustable with a color picker, tilt ranges from 0 to 90 degrees, and opacity from 5 to 100 percent via sliders.
Is there a file size limit?
You can process up to 200MB at a time.
Will the watermark cover the body text?
It's laid on semi-transparently, so at a reasonable opacity (20–30%) it doesn't get in the way of reading.
Are my files uploaded to a server?
No. Everything is processed 100% in your browser.