How to watermark pdf online
- 1
Add the PDF you want to watermark.
- 2
Type your text and adjust opacity, size, and angle.
- 3
Click Add watermark and download the stamped PDF.
Why use PDFLark's Watermark PDF?
- Mark documents as Draft, Confidential, or with your brand.
- Fine-tune opacity and angle for the perfect look.
- Watermarking happens locally — your file is never uploaded.
Frequently asked questions
Can I control how visible the watermark is?
Yes. Adjust the opacity slider from a faint background mark to a bold, prominent stamp.
Is the watermark applied to every page?
Yes. Your text watermark is stamped across all pages of the document.
Is it really free?
Yes. Every PDFLark tool is completely free with no daily limits, no file-count caps, and no watermarks added to your documents.
Are my files uploaded to a server?
No. All processing happens locally in your browser using JavaScript. Your files never leave your device, which is why PDFLark works even on private or confidential documents.
Do I need to create an account?
No account, no email, and no sign-up. Open the tool, add your file, and download the result.
Which browsers and devices are supported?
PDFLark works in any modern browser — Chrome, Firefox, Safari, and Edge — on Windows, macOS, Linux, iPhone, and Android.