How to Add a Watermark to a PDF
To add a watermark to a PDF, open the free Watermark PDF tool, type your text — DRAFT, CONFIDENTIAL, PAID, your company name — choose size and transparency, and download. The watermark is applied diagonally across every page in seconds, in your browser, without installing anything or uploading the document anywhere.
This guide is for anyone sharing documents that need a visible status or ownership mark: draft reports, confidential agreements, review copies, and portfolios.
Why watermark a PDF at all?
- Prevent premature use: a diagonal DRAFT across every page stops a work-in-progress being mistaken for the final version — a surprisingly common and expensive mix-up.
- Signal confidentiality: CONFIDENTIAL or INTERNAL reminds every reader (and every forward) how the document should be handled.
- Mark ownership:your name or company across sample work makes it less attractive to pass off as someone else's.
- Show status:APPROVED, VOID, SPECIMEN, COPY — one glance tells the reader what they're holding.
Step-by-step
- Open the Watermark PDF tool and choose your PDF.
- Type the watermark text. Short and uppercase reads best — DRAFT beats "this is a draft version".
- Set the opacity. Start at 15% and nudge up only if it's too subtle on your particular page background.
- Set the size — 60pt suits a single word on A4/Letter; drop to 40pt for two or more words.
- Keep Diagonal ticked for the classic corner-to-corner look, or untick it for a horizontal mark.
- Click Download watermarked PDF — every page now carries the mark.
Choosing the right settings for each job
Draft documents
DRAFT, diagonal, 15% opacity, large. Visible on every page without making review reading tiring.
Confidential material
CONFIDENTIAL, diagonal, 15–20%. Consider adding the recipient's name ("CONFIDENTIAL — FOR ACME LTD") so a leaked copy is traceable to its source. That single addition changes how carefully people forward things.
Samples and portfolios
Your name or brand, diagonal, 10–15%, sized to cross the whole page so cropping it out isn't practical.
Watermark vs. stamp: which one do you need?
Use the watermark tool when the same text belongs on every page as a background layer. Use the Stamp & Sign tool when you need an image (logo, signature, rubber-stamp graphic) or a mark at one specific spot — like PAID across an invoice total. The two combine well: a CONFIDENTIAL watermark on all pages plus a signature stamp on the last one.
Frequently asked questions
▸What opacity should a PDF watermark be?
10–20% opacity is the sweet spot for a background watermark: clearly visible when you look for it, but the document text stays comfortably readable. Go bolder (30-40%) only when the warning matters more than reading comfort, e.g. VOID or SPECIMEN.
▸Can I remove a watermark later?
The watermark is drawn into the page content of the downloaded copy, so it isn't a separate layer you can simply switch off. Keep your original un-watermarked PDF — treat watermarked copies as exports for sharing.
▸Can I use my logo as a watermark instead of text?
For an image-based mark, use the Stamp & Sign tool: save your logo to the library and place it on the pages where you need it. The watermark tool is for text; the stamp tool covers images.
▸Does the watermark appear when the PDF is printed?
Yes. Because the watermark becomes part of the page itself, it shows up in print, in screenshots, and in every PDF viewer — that's exactly what makes it useful for marking DRAFT or CONFIDENTIAL.
Ready to try it yourself?
Free, no signup, and your file never leaves your device.
Watermark a PDF now — free