Add Watermark
Add text or image watermark to your PDF files.
What is Add Watermark to PDF?
Stamp a text watermark across the centre of every PDF page. Set the wording and the file is written locally in your browser. Free and private.
When should you use it?
This tool is useful when you need to add, change, or clean up visible content inside a PDF while staying in your browser.
How Add Watermark to PDF handles your file
Text is drawn onto each page with pdf-lib inside your browser. Nothing is uploaded.
Your device's own CPU does the work, so there is no upload wait and no server-side copy of your document to retain.
Good to know before you convert
- Text watermarks only — there is no image or logo watermark option.
- The stamp is drawn at the centre of every page in a fixed 48pt grey Helvetica style at 30% opacity; position, size, colour, rotation, and opacity are not adjustable.
- It applies to every page; page ranges and odd/even selection are not available.
How to use Add Watermark to PDF
Upload your PDF document.
Type the watermark wording you want stamped on the pages.
Click 'Add Watermark!' to draw it onto every page and download the stamped PDF.
Why choose PdfPix for Add Watermark to PDF?
Private by design
The file is never uploaded. Everything happens inside your browser tab, so there is no remote copy of your document to leak, retain, or subpoena.
No File Size Limits
Because conversions run locally using your computer's CPU power, we don't impose any artificial file size caps, queue delays, or wait times.
100% Free Forever
Get full access to all features without subscriptions, credit card inputs, or registration walls. No branding watermarks added to your outputs.
Universal Compatibility
PdfPix runs smoothly inside any modern browser on macOS, Windows, Linux, iOS, or Android, without needing external applications or plugins.
How PdfPixCompares to iLovePDF & Smallpdf
Unlike traditional cloud PDF services that upload your confidential documents to remote servers, PdfPix processes your files 100% in your browser. No file size paywalls, no task queues, and zero remote data retention.
Frequently Asked Questions
Can I customise the watermark?
You control the text. The styling is fixed — 48pt grey Helvetica at 30% opacity, centred on each page — so size, colour, rotation, opacity, and position are not adjustable in this version.
Can I use a logo or image as the watermark?
Not with this tool. Only text watermarks are supported. For a logo, consider placing the image with the Edit PDF tool instead.
Can I choose which pages are watermarked?
The watermark is applied to every page in the document. Page ranges are not currently supported.
Is my watermark text secure?
Yes. The stamp is drawn locally in your browser and neither the text nor the document is transmitted.
Related PDF tools
Rotate PDF
Rotate PDF pages by 90 degrees left or right.
Edit PDF
Add text, images, shapes or freehand annotations to a PDF document.
Add Page Numbers
Number the bottom centre of every page, starting from any value.
Crop PDF
Trim the margins of every page with numeric offsets on each side.
Related guides from the PdfPix blog
Step-by-step articles that show how to get the most out of Add Watermark to PDF in real workflows.