How to use Watermark PDF
- Choose your files, or drag & drop them anywhere on the page.
- Reorder or adjust the settings, then hit the big button.
- When it's ready, click "Save." Your files never leave your device.
FAQ
Can I use Japanese or Chinese text?
Yes. The text is drawn with your device's own fonts and placed as an image, so any language works.
Can the watermark be removed later?
It is added as a separate layer on top of each page. Keep your original file if you need a clean copy.
Is it safe to use Watermark PDF with my files?
Yes. Your files are never uploaded — they're processed only inside your browser. Every page is served with a policy that blocks outgoing connections (Content-Security-Policy connect-src 'none'), and the counter in the bottom-left shows the data sent: 0 bytes.
Is it free? Do I need an account?
It's completely free, no account needed, and there are no usage limits.
Does it work on my phone?
Yes. It works in mobile browsers on iPhone and Android. For very large files, a computer will be faster.