How to Add a Watermark
to a PDF Free Online
Stamp any PDF with a text or image watermark in seconds — control opacity, rotation, and position, all without uploading your file anywhere.
Try PDF Watermark ToolWhy watermark a PDF?
Watermarks serve several purposes: marking documents as CONFIDENTIAL or DRAFT during review, protecting proof documents sent to clients before payment, branding your PDFs with a company logo, or discouraging unauthorized copying and distribution.
Lawyers, designers, photographers, accountants, and HR departments all use watermarks routinely. Adobe Acrobat Pro charges $14.99/month for this — our tool does it for free in your browser.
How to add a watermark to a PDF — step by step
Open the PDF Watermark tool
Navigate to the free PDF Watermark tool. No account or installation needed — it runs entirely in your browser.
Upload your PDF
Drag and drop your PDF or click to browse. Your file loads into your browser's memory and is never sent to any server.
Configure your watermark
Choose text or image watermark. Set the text content, font size, opacity, colour, rotation angle, and position (centre, tiled, or corner).
Download the watermarked PDF
Click Apply Watermark and your watermarked PDF downloads instantly, ready to share or distribute.
Pro tips for effective watermarks
Use 20–30% opacity for subtle watermarks
A watermark that's too dark distracts from the content. 20–30% opacity is the professional standard — visible enough to deter copying, subtle enough not to impede reading.
Diagonal text is harder to remove
A 45-degree rotated text watermark covering the full page is significantly harder to digitally remove than a corner stamp. Use diagonal text for confidential documents.
Tiled watermarks for maximum protection
Repeating the watermark in a tiled pattern across the whole page makes it nearly impossible to crop or remove without obvious damage to the document.
Use CONFIDENTIAL or DRAFT labels
Standard watermark text like 'CONFIDENTIAL', 'DRAFT', 'SAMPLE', or your company name clearly communicates the document's status to the recipient.
Your PDF never leaves your device
Watermarking uses pdf-lib running entirely in your browser. Confidential contracts, client proposals, and financial documents stay completely private — never uploaded to any server.
Frequently asked questions
Can I add a logo as a watermark instead of text?
Yes — the PDF Watermark tool supports both text and image watermarks. Upload a PNG (ideally with a transparent background) to use as a logo stamp.
Will the watermark affect the PDF's text or links?
No. The watermark is added as an overlay layer. Existing text, links, form fields, and bookmarks in the PDF remain fully functional.
Can recipients remove the watermark?
A watermark rendered into the PDF with pdf-lib is part of the page content, not a separate layer. It cannot be removed with a simple 'remove watermark' button. However, sophisticated PDF editing tools could potentially edit it out.
Can I watermark multiple pages at once?
Yes — the watermark is applied to all pages in the PDF by default. You can choose to apply it only to specific pages if needed.
Is my PDF safe when I watermark it online?
Completely safe. Watermarking uses pdf-lib running entirely in your browser — your PDF never leaves your device or gets uploaded to any server.
Can I remove a watermark from a PDF?
If you added the watermark yourself using this tool and have the original unwatermarked PDF, simply use the original. If you need to remove a watermark from a PDF you received, note that this tool only adds watermarks — we don't provide watermark removal.