Watermark PDF. Privately.
Stamp CONFIDENTIAL, DRAFT or your name diagonally across every page. It all happens in your browser, so your file is never uploaded — and we don't add a watermark of our own. That's the part iLovePDF can't say.
Truly private
Files never leave your device
Instant
No upload/download round-trip
No limits
Any size, any page count
How it works
- 01
Add your PDF
Drop in a PDF, or click to browse. It stays on your device.
- 02
Type your text
Enter the watermark (e.g. CONFIDENTIAL or DRAFT) and pick how strong it should be.
- 03
Download
We stamp a diagonal watermark across every page in your browser — nothing is uploaded.
More PDF tools: Merge · Split · Rotate · Compress · Page numbers · Organize · Crop · Sign · Redact · Add text · N-up · Protect · Unlock · Repair · PDF/A · OCR · To images · Extract images.
Common questions
Are my files uploaded?+
No. The watermark is added entirely in your browser with a local PDF engine — your file never leaves your device. iLovePDF and most tools upload your PDF to their servers first.
Where does the watermark go?+
A single large watermark is placed diagonally across the centre of every page, at the strength you choose.
Can I change the opacity?+
Yes — pick Light, Medium or Strong so the watermark is visible without hiding your content.
Is there a limit?+
No artificial caps. Free, unlimited, no signup or extra watermark of our own.
Does it keep quality?+
Yes — your pages are untouched; we only overlay the watermark text.