Processed on your device
Your PDF stays inside this browser tab. It is not uploaded to Doruni.
Watermark a PDF before it leaves your hands.
Mark a draft, label confidential material or add a logo. Drag the mark into place, style it and choose which pages receive it.
Drop a PDF here to watermark it
One PDF · up to 50 MB · up to 100 pages
Choose a PDF to begin.
Free without an account
Use the complete tool and download the result without signing up.
Review before saving
Page previews and an explicit result step help you verify the change.
Add a clear mark without covering the document.
Start with a restrained opacity, then use the result preview to confirm that the watermark is visible without obscuring essential content.
- 01
Choose one PDF
Doruni opens the document locally and prepares its pages.
- 02
Choose text or an image
Enter a label or select a PNG/JPG logo, then set opacity and angle.
- 03
Apply and review
Choose the page range, add the watermark, inspect the result and download it.
Text, logo or stamp—placed where it belongs.
Drag the watermark on the preview, adjust its size and appearance, then apply it to the page range that needs the mark. Text is rendered locally for multilingual support.
- Use custom text or a PNG/JPG image.
- Choose 5–90% opacity, any five-degree angle and a custom position.
- Apply the watermark only to the selected page range.
Visible marking is not access control.
A watermark can communicate status or ownership, but it does not encrypt the PDF or prevent someone from editing it with specialist software.
Best forDraft labels, confidentiality notices, review copies, logos and ownership marks.
Watermark typesUp to 80 characters of coloured text, or one PNG/JPG image.
Applied toA chosen page range with custom position, size, opacity and angle.
Important limitA visible watermark is a deterrent and label, not password protection or DRM.
Use the mark for the right purpose.
Can I add a logo instead of text?
Yes. Switch to Image and choose a PNG or JPG. Transparent PNG files work well for logos.
Will the watermark cover the PDF text?
It is added over the page. Lower opacity helps keep the underlying content readable; always review the result before sharing.
Does a watermark prevent copying?
No. A watermark communicates status or ownership but does not encrypt the file or stop determined editing.
Can I use Japanese or accented watermark text?
Yes. Doruni renders text locally through your browser before embedding it, which supports the scripts available in your browser fonts.