Watermark PDF
Stamp text like “CONFIDENTIAL” or “DRAFT” across every page of a PDF, with adjustable opacity — all in your browser.
At a glance
- Where it runs
- Runs in your browser — your file is never uploaded.
- File size
- No fixed size limit — large files are bounded by your device's memory.
- Offline
Works offline — everything it needs is already on your device.
- Batch
- One file at a time.
- Cost
- Free, with no account and no daily limit.
File Converts adds text watermarks locally with pdf-lib. Set the text, opacity, and a diagonal or horizontal placement, then download. Because it runs on your device, sensitive documents are never uploaded.
Best for
- Marking a document "Draft," "Confidential," or "Copy" before sharing
- Branding a PDF with your name or company across every page
- Discouraging unauthorised reuse of a shared document
Good to know
Stamps a text watermark across the pages of a PDF and saves a new copy — all on your device, nothing uploaded. It overlays text (like DRAFT or CONFIDENTIAL); it doesn't encrypt or lock the file. To password-protect it instead, use Protect PDF. Your original stays untouched.
How to convert PDF → Watermark
Drop your PDF into the tool above.
Type the watermark text and adjust opacity.
Click Add watermark to download.