Add a Watermark to a PDF Online
in Seconds
Insert a watermark into your PDF in seconds with Lumr's secure online tool. Stamp your documents with custom text or an image, right from your browser, with no need to download software.
or drop your files here
Max file size 100 MB
- No signup needed
- Private & encrypted
- 256-bit SSL
- AES-256 encrypted
- SOC 2 Type II
How to Add a Watermark to a PDF in 3 Easy Steps
Upload your PDF
Drag and drop your file into the upload area above, or select it from your computer.
Add your watermark
Choose text or an image, then set the position, size, and opacity. Apply it to every page or only the ones you choose.
Download your watermarked PDF
Download your finished file, ready to share or store with your watermark in place.
The Fastest and Most Secure Way to Watermark
a PDF Online
Lumr gives you full control over how your watermark looks and where it appears, without ever leaving your browser.
Custom text and image watermarks
Your choice, your branding
Add a text stamp, a logo, or any image file as your watermark. Then, adjust the wording, font, and placement to suit the document.
Adjustable opacity and position
Subtle or bold, your call
Set the transparency and position of your watermark so it protects the page without hiding the content underneath.
Instant online processing
No waiting around
Upload your PDF and download the watermarked version in moments, even for longer documents.
Practical and intuitive tool
Straightforward, from start to finish
A few clicks are all it takes to add watermark to your PDF file, from upload to download.
Works on any device
Any OS, any screen
Add a watermark to a PDF document on Windows, macOS, Linux, Android, or iOS, in any modern browser.
Secure and private processing
Encrypted every step
Lumr uses encrypted processing to keep your documents private. They’re safe at all times throughout the watermarking process.
Trusted Every Day for PDF Watermarking
See what people have to say about adding a watermark to a PDF with Lumr.
“I stamp our logo on every proposal before it goes out. It takes seconds and keeps everything on brand.”
Sarah M.
Marketing Manager
“Adding a DRAFT watermark to client previews used to mean opening heavy software. Now I just upload and done.”
James K.
Freelance Designer
“Marking documents as CONFIDENTIAL across every page is effortless. Exactly the tool we needed.”
Ana L.
Legal Assistant
FAQs About Watermarking a PDF
Still have questions about how to add a watermark to a PDF? Check out the answers below.
Can you add a watermark to a PDF?
Yes. Lumr lets you add a watermark to a PDF online in just a few clicks. You can add either custom text or an image file.
Upload your document, set the wording or image, adjust the position and opacity, then download the finished file. No software installation is required.
Can I adjust the opacity and transparency of the watermark?
Yes, you can set the opacity of your watermark before downloading the file.
A lower value creates a subtle, semi-transparent mark, while a higher value makes it more prominent. This lets you protect a document without obscuring the text underneath.
Will adding a watermark change or corrupt the original text layout?
No. Adding a watermark places the text or image over your document without altering the underlying layout, formatting, or content.
Your original text, images, and page structure stay exactly as they were.
Can I delete a watermark after adding it to my PDF?
Yes, while you're still working in the tool. You can remove or adjust the watermark before you download the file.
Once downloaded, you would need to re-upload the original PDF to apply a different watermark.
Does the watermark apply to every single page?
By default, Lumr applies your watermark to every page of the document. You can then remove it from individual pages afterwards if you only want it to appear on some of them.
Do I need to install any software to watermark my documents?
No, Lumr works entirely online. You only need a browser and an internet connection to add a watermark to a PDF file, with no downloads, plugins, or installations required.
Can you insert a watermark in a PDF on a smartphone?
Yes, Lumr's tool works on mobile browsers as well as desktop. You can insert a watermark in a PDF from an iPhone or Android device just as easily as from a computer.
Is it safe to add watermarks with Lumr?
Yes. Lumr processes your files securely and does not retain them once you've downloaded your watermarked PDF. Your documents stay private throughout.
Security you can trust
Independently audited and compliant with the security and privacy standards your documents demand.
- SOC 2 Type II
- GDPR
- ISO 27001
- HIPAA
- eIDAS
- PCI DSS
Ready to watermark your PDF?
Join millions of users who trust lumr for fast, secure PDF tools. No fees, no hassle.
- Ready in 3 seconds
- 256-bit SSL secure
- Works on any device