PDF Watermark Tool Free
Add a custom text watermark to every page of your PDF. Control position, color, opacity, and size.
Drop your PDF here
or click to browse files
PDF Watermark Features
Full control over watermark appearance and placement.
Watermark Options
Enter any text as your watermark, such as CONFIDENTIAL, DRAFT, or your company name.
Adjust watermark transparency from subtle to fully opaque using the opacity slider.
Choose any color for your watermark text using the built-in color picker.
Output
PDF.js and Canvas API render and watermark pages quickly in the browser.
Download each watermarked page individually as a high-quality JPG image.
Your PDF stays on your device. browser-side workflows is done locally.
Key Takeaways
- PDF watermarking uses PDF.js in the browser when supported; for sensitive documents, confirm the active workflow before processing.
- Choose from five placements: center is the only one that tilts the text diagonally across the page (best for CONFIDENTIAL or DRAFT), while the four corner options stay horizontal with a fixed margin for subtle status or branding tags.
- Output is one JPG image per page, not an editable PDF, because writing a watermark back into the PDF binary would require server-side processing - it is ideal for flat images to share by email, chat, or slides.
- Tune visibility with the opacity slider (5 to 100 percent) plus color; use a larger font and 50 to 70 percent opacity for clear draft marks, and keep long text in the center position since corner placements can cut it off at the edge.
How to Add a Text Watermark to a PDF
Load your PDF
Drag your PDF onto the upload area or click Choose PDF File to select it. PDF.js reads the file in the browser when supported. For sensitive documents, confirm the active workflow before processing.
Set the text and appearance
Type your watermark text, then pick a font size, color, and opacity. Choose a position: center places the text diagonally across the page, while the four corner options anchor it near an edge. Opacity ranges from 5 to 100 percent.
Apply and download per page
Click Add Watermark. Each page is rendered to a canvas at high resolution, the watermark is drawn on top, and every page becomes a separate JPG you download individually.
Watermark Position Options Compared
This tool offers five placement modes. Center is the only mode that rotates the text diagonally; the corner modes draw it horizontally with a fixed 20 pixel margin from the page edge. Use the table below to pick the right one for your document.
| Position | Rotation | Typical Use | Visibility |
|---|---|---|---|
| Center (diagonal) | Tilted about 30 degrees | CONFIDENTIAL, DRAFT, SAMPLE | Highest, spans the page |
| Top Left | None | Document status or owner tag | Moderate, near header |
| Top Right | None | Version or date label | Moderate, near header |
| Bottom Left | None | Source or copyright note | Lower, near footer |
| Bottom Right | None | Page reference or initials | Lower, near footer |
Choosing the Right Watermark Settings
Marking drafts clearly
Pick the center diagonal position with a larger font size and a higher opacity around 50 to 70 percent. The tilted text is hard to ignore and signals that the document is not final.
Subtle branding
Use a corner position with a smaller font, a light gray or muted color, and a low opacity of 15 to 30 percent. The mark stays readable without competing with the page content.
Confidentiality stamps
Type text such as CONFIDENTIAL or your company name, choose center placement, and keep opacity moderate so the underlying text remains legible while the warning stays prominent on every page.
Sharing as images
Because each page is exported as a JPG, this tool fits cases where you want flat, easy-to-view images for email, chat, or slides rather than an editable PDF with selectable text.
Common Problems and Fixes
The watermark is too faint or too strong
Adjust the opacity slider, which runs from 5 to 100 percent. Combine a higher value with a darker color to make the mark stand out, or lower it and use a light color for a subtle effect.
Long text gets cut off in a corner
Corner positions keep the text near the edge, so very long phrases can run past the page boundary. Use the center position for long text, or reduce the font size so the wording fits within the margin.
I expected a PDF but got JPG files
This browser tool renders each page to a canvas and saves the result as a JPG image. Writing a watermark back into the PDF binary requires server-side editing, so the output is one image per page by design.
A large PDF is slow to process
Pages are rendered one at a time at high resolution, so multi-page or image-heavy PDFs take longer. Wait for the status message to report each page, and avoid switching tabs until processing finishes.
How to Add a Watermark to a PDF
Upload your PDF, enter the watermark text, configure position and appearance settings, then click Add Watermark. Each page will be rendered with the watermark and made available as a downloadable JPG.
Frequently Asked Questions
Are my PDF files uploaded to a server?
No. browser-side workflows is done locally in your browser using PDF.js and the Canvas API.
Your files stay on your device for browser-side workflows at any point.
For sensitive documents, confirm browser-side mode before continuing.
Why are the output files JPG and not PDF?
Adding a text watermark directly to a PDF binary requires full PDF editing, which is hard to do entirely in the browser.
This browser-based tool renders each PDF page to a canvas and draws the watermark on top.
The result is saved as a JPG image, which is suitable for most use cases.
What positions can I use for the watermark?
Center places the watermark diagonally across the middle of the page.
Corner positions (top-left, top-right, bottom-left, bottom-right) place the text near the edges.
The center diagonal style is the most common for confidentiality watermarks.
How do I make the watermark subtle?
Lower the opacity using the slider. Values between 15 and 30 percent create a light watermark.
Use a light color such as gray or light red for a more subtle effect.
A smaller font size also reduces the visual impact of the watermark.
Can I watermark a multi-page PDF?
Yes. All pages in the PDF are processed and watermarked.
Each page appears as a downloadable JPG image after processing.
Large PDFs may take a moment to process page by page.
Is the watermark permanent?
The watermark is embedded into the rendered JPG image and cannot be removed easily.
This provides a reasonable level of protection against casual removal.
For production use cases, a dedicated PDF watermarking solution is recommended.
Is there a file size limit?
There is no enforced file size limit.
Very large PDFs may take more time to render each page.
Most typical documents will process quickly.
Is this tool free?
Yes, completely free with no registration.
There are Practical workflow limits on the number of files you can watermark.
No extra watermarks or branding are added to your output.
Sources and References
Format and tool details on this page are based on the official specifications and documentation below.
- Portable Document Format (PDF)- Library of Congress
- PDF- MDN Web Docs glossary