Watermark PDF
Add a diagonal text watermark to every page of your PDF. Customise the text, opacity, size, and colour.
Drop files here, browse
Drop a PDF to watermark
Max file size: 100 MB
Some encrypted or restricted PDFs may not process. Try the Unlock PDF tool first. Password-protected PDFs require the correct password.
Custom Text
Enter any watermark text — "CONFIDENTIAL", your company name, "DRAFT", or anything else.
Private
Watermarking runs in your browser using pdf-lib. Your document is never sent to a server.
All Pages
The watermark is applied to every page of the document automatically.
How to watermark a PDF
- Drop your PDF onto the upload area above.
- Enter your watermark text and customise the colour, opacity, and font size.
- Click Apply Watermark and download the watermarked PDF.
Privacy — your files stay on your device
ConvertForge processes files directly in your browser using pdf-lib so your files stay on your device. Watermarking is applied entirely client-side with no server upload. Your files are never sent to any server.
Frequently Asked Questions
Is this tool free?
Yes, completely free. No account, no signup, no limits.
Are my files uploaded to a server?
No — processing runs in your browser. Your files never leave your device.
Does it work on mobile?
Yes — any modern browser on iOS, Android, Mac, Windows, or Linux works.