How to Add a Watermark to a PDF for Free
Watermarking a PDF is a practical way to protect your work, label document status, or mark files as confidential before sharing. Common use cases include stamping drafts with "DRAFT", marking proofs with "NOT FOR DISTRIBUTION", or branding a portfolio with your company name.
Most tools that do this are expensive or require you to upload your document to a server. This guide shows you how to watermark a PDF entirely in your browser — free, private, and with full control over how the watermark looks.
What you can control
PeakPDFs gives you fine-grained control over every aspect of the watermark:
Text
Any text up to 60 characters — "DRAFT", "CONFIDENTIAL", your company name, or anything else.
Colour
Six presets (gray, red, amber, green, blue, black) plus a custom colour picker for exact brand matching.
Opacity
5% to 80% — low opacity lets the document content show through clearly. Higher opacity makes the watermark dominant.
Angle
−90° to +90° — the classic diagonal look is around 30–45°. Horizontal is 0°.
Size
12 pt to 120 pt. Larger text is more visible on A4/Letter pages; smaller is subtler.
Pages
All pages, odd pages only, even pages only, or first page only.
How to watermark a PDF in your browser
Watermark PDF free — files never leave your device
Open Watermark Tool →- Go to the Watermark PDF tool
- Upload your PDF by dragging it onto the drop zone or clicking to browse
- Type your watermark text (e.g. "DRAFT" or "CONFIDENTIAL")
- Adjust colour, opacity, size, and angle using the sliders — the live preview updates as you go
- Choose which pages to stamp: All pages, Odd, Even, or First only
- Click Apply Watermark
- Download your watermarked PDF instantly
Tips for getting the watermark right
- Use 15–25% opacity for subtle branding — low opacity looks professional and keeps the document readable. High opacity (50%+) is best for prominent "DRAFT" or "CONFIDENTIAL" marks.
- Diagonal at 30–45° is the classic look — this angle spreads the watermark evenly across the page without obscuring the centre. Horizontal or vertical watermarks can work for specific designs.
- Match your brand colour — use the custom colour picker to enter your exact hex code. A branded watermark looks more professional than the default gray.
- Keep a copy of the original — the watermark is baked into the PDF permanently. Store the unmodified original somewhere safe before sharing the watermarked version.
Is the watermark permanent?
Yes. The watermark is embedded directly into the PDF page content using PDF drawing operations. It's not a separate layer that can be easily removed — it becomes part of the page itself. This is intentional: it makes the watermark robust against casual removal.
If you need a removable watermark (e.g. for proofing workflows), a professional tool like Adobe Acrobat handles layered watermarks. PeakPDFs is designed for permanent embedding.
Frequently asked questions
Can I watermark a PDF for free without signing up?
Yes. PeakPDFs requires no account and is completely free. Your file never leaves your device — all processing happens locally in your browser.
Can I watermark only the first page?
Yes. Choose "First page only" in the apply mode dropdown before clicking Apply Watermark. You can also apply to odd pages, even pages, or all pages.
Will the watermark survive printing?
Yes. The watermark is embedded in the PDF content and will print exactly as shown in the on-screen preview.
Can I add an image watermark instead of text?
Not currently — the tool supports text watermarks only. Image watermark support is on the roadmap for a future update.
Does watermarking affect the original file quality?
No. Text watermarks are added as vector drawing operations on top of the existing page content. The original images, fonts, and vector graphics in the PDF are not modified or re-encoded.