Add Watermark to PDF Online – Free PDF Watermark Tool
Stamp any PDF with a custom text watermark — CONFIDENTIAL, DRAFT, your company name, or any text you choose. Free, instant, and your files never leave your browser.
How to Add a Watermark to a PDF
- 1Enter your watermark text
Type the text you want to appear as the watermark (e.g. CONFIDENTIAL, DRAFT, © Your Name).
- 2Upload your PDF
Drop the PDF into the upload area. The watermark is stamped diagonally across every page automatically.
- 3Download the watermarked PDF
Save your PDF with the watermark applied. The underlying content remains fully readable.
Why Add a Watermark to PDF Files?
Mark your original research, designs, or reports with your name or logo to deter unauthorised reuse.
Stamp DRAFT or REVIEW across documents shared for feedback to prevent premature circulation of final versions.
Mark sensitive business documents with CONFIDENTIAL to signal that the content is not for public distribution.
Add your company name or website URL to PDFs shared as marketing materials or downloadable resources.
Frequently Asked Questions
How do I add a watermark to a PDF?+
Enter your watermark text (e.g. CONFIDENTIAL, DRAFT, or your company name) in the field above, then upload your PDF. AllInOnePDF stamps the watermark diagonally across every page.
Can I customise the watermark text?+
Yes. You can enter any text you like. The watermark is displayed in large, semi-transparent letters diagonally across each page.
Is the watermark removable?+
The watermark is embedded in the PDF page content, making it difficult to remove with standard PDF readers. For tamper-proof watermarks in high-security contexts, consider server-side solutions.
Will the watermark cover my content?+
The watermark is rendered at 30% opacity, meaning the underlying text and images remain clearly visible and readable.
Can I add an image watermark?+
Currently AllInOnePDF supports text watermarks. Image watermark support is planned for a future update.