Watermark PDF
Add a text watermark to every page of a PDF in your browser. Opacity, size, and diagonal stamp options. No upload required.
Your file
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When to use this tool
- Mark review copies as DRAFT before sharing.
- Stamp CONFIDENTIAL on HR or legal packets.
- Brand sample PDFs with your studio name.
- Add “NOT FOR DISTRIBUTION” to client previews.
- Label student submissions with a class code.
Related tools & guides
Before stamping, fix page rotation, extract only the pages you need, or compress before sharing.
How to watermark pdf
- Choose a PDF from your computer.
- Enter watermark text in Latin characters (e.g. CONFIDENTIAL, DRAFT, your name).
- Adjust opacity and font size; keep diagonal on for a classic draft stamp.
- Download the watermarked PDF — never uploaded to a server.
FAQ
Can I make a light diagonal watermark? +
Yes. Use opacity around 0.15–0.3 and keep diagonal mode enabled.
Is watermarking free? +
Yes for personal use. Local processing means no per-file server cost.
Why only Latin characters for now? +
Built-in PDF standard fonts cover Latin glyphs. Chinese watermark fonts are planned; until then use English text like CONFIDENTIAL.
Does the watermark become part of the PDF? +
Yes. It is drawn onto each page of a new PDF you download.
Can recipients remove it easily? +
Determined users might edit PDFs, but a visible stamp still deters casual misuse of drafts.
Is my file uploaded? +
No. Watermarking uses pdf-lib in your browser only.
Why use a no-upload PDF tool?
Most free PDF websites ask you to upload contracts, IDs, and invoices to unknown servers. Even if they delete files later, the transfer itself is a privacy risk — and some sites inject watermarks or hard limits.
LocalPDF runs entirely in your browser with open libraries. Your file is never posted to our origin. That also means lower cost for us, so the core tools can stay free while we expand.
Looking for another tool? Try Compress PDF, Split PDF, Merge PDF, or Rotate PDF.