Is the PDF watermark tool free?

Yes, completely free. No signup, no credits, no hidden fees. Watermark unlimited PDF files for free.

Are my PDF files uploaded to a server?

No. All watermarking is done locally in your browser using pdf-lib. Your files never leave your device and are never uploaded to any server.

Can I add a CONFIDENTIAL watermark to my PDF?

Yes. Use the preset buttons to instantly apply CONFIDENTIAL, DRAFT, COPY, SAMPLE, or DO NOT COPY watermarks with one click. You can also type any custom text.

Can I control the watermark opacity?

Yes. Use the opacity slider to set how visible the watermark is, from 10% (very faint, almost invisible) to 100% (fully opaque). Most professional documents use 20-30% opacity.

Will the watermark appear on all pages?

Yes. The watermark is applied to every page of the PDF automatically.

Can I choose the watermark position?

Yes. Choose from Diagonal (classic angle across the page), Horizontal (straight across center), Top, Center, or Bottom positions.

What font size should I use for a watermark?

For A4 or Letter-size PDFs, a font size of 60-80pt works well for diagonal watermarks. Use 40-60pt for horizontal watermarks. The preview shows exactly how it will look.

Can I remove the watermark after adding it?

Watermarks added by this tool are embedded in the PDF content and cannot be easily removed. Keep a copy of your original PDF if you may need to make changes later.

Does adding a watermark affect PDF quality?

No. Adding a watermark only adds a text layer on top of the existing content. The original PDF content, fonts, and images remain completely unchanged.

Can I watermark a password-protected PDF?

Password-protected PDFs must be unlocked first. Use our Unlock PDF tool to remove the password, then add the watermark.

Does this work on mobile?

Yes. The PDF watermark tool works on all devices including iPhone, Android, Windows, Mac, and Linux — directly in your browser.

Add Watermark to PDF Free Online

💧

Drop your PDF here

or browse to upload · PDF only · Files never uploaded to server

👁️ Live Preview Page 1 preview

⚡ Quick Presets

✏️ Watermark Text

Text

Font Style

Position

🎨 Style

Font Size60pt

Opacity25%

Rotation-45°

Color

#ff0000

Applying...

Tips

👁️

Best Opacity for Watermarks

Use 20–30% opacity for professional documents — visible enough to be seen but light enough that the content underneath is still readable.

📐

Diagonal = Classic

Diagonal watermarks at -45° are the most common and hardest to remove or crop out. Use "Tiled" for maximum coverage across the entire page.

🎨

Color Tips

Red is the classic confidential color. Gray works well for subtle draft markings. White watermarks are great for dark-background PDF designs.

Add text or image watermark to PDF files online for free

Free Online PDF Watermark Tool — No Signup Required

iPixLab.com's PDF watermark tool lets you stamp custom text onto every page of your PDF directly in your browser. No software to install, no account to create, and no files ever uploaded to a server. Everything runs locally using the pdf-lib JavaScript library — your documents stay completely private on your device.

Common Uses for PDF Watermarks

Mark documents as CONFIDENTIAL
Label working copies as DRAFT
Add COPY or SAMPLE to proposals
Protect documents shared online
Add branding to PDF reports
Mark internal or review copies

How to Add a Watermark to a PDF Online

Upload your PDF and the first page appears as a live preview. Type your watermark text or choose a preset like CONFIDENTIAL or DRAFT. Adjust the opacity, font size, color, rotation, and position — the preview updates instantly so you see exactly how the watermark will look. Click "Apply Watermark" to process all pages and download your watermarked PDF.

What Opacity Should I Use?

For professional documents, 20–30% opacity is recommended — the watermark is clearly visible but the content underneath remains readable. Use 40–60% for stricter marking where readability is less important. Use 10–15% for very subtle background branding.

100% Private — Files Never Leave Your Device

All watermarking happens locally in your browser using pdf-lib. Your PDF files are never sent to any server — no privacy risk, no data storage. Works on any device including iPhone, Android, Windows, and Mac.