Step 1
Upload a PDF file from your device
Add Watermark to PDF
Protect your documents or mark them as drafts by adding a text watermark. Adjust opacity, size, and angle — then download the watermarked PDF without any server upload.
Drag your file here, or browse
Add text watermarks to your PDF files directly in the browser. Your files never leave your device.
How to use Add Watermark to PDF
Step 2
Enter your watermark text and adjust appearance settings
Step 3
Download the watermarked PDF instantly
Features
Browser-only
your PDF never leaves your device
Full control over text
position, opacity, and rotation
Watermark is applied to every page of the document
Supports center and diagonal text placement
Complete Guide to Adding Watermarks to PDF
What this tool does
A PDF watermark is a visible text overlay applied across every page of a document. Watermarks serve multiple purposes: marking documents as Draft, Confidential, or For Review Only; identifying ownership of shared materials; discouraging unauthorized redistribution; and indicating document status in approval workflows. Unlike headers or footers that sit in the margins, watermarks appear across the main content area of each page — typically as semi-transparent text rendered at an angle.
How to use it
- Upload your PDFUse the file picker or drag it into the tool.
- Enter your watermark textCommon choices include CONFIDENTIAL, DRAFT, SAMPLE, your company name, or a date stamp.
- Configure the appearanceChoose center or diagonal positioning, then adjust opacity and font size.
- Preview and confirmSee the watermark on your document before applying.
- Apply and downloadThe browser processes every page locally; the original file remains unchanged.
Specs & limits
- Input
- PDF ≤50 MB
- Positioning
- Center / diagonal 45°
- Opacity
- Nearly invisible → fully opaque
- Applies to
- Every page
- Processing
- In your browser
- Sign-in
- Not needed
Font size is adjustable to accommodate different page dimensions and text lengths. The output is a standard PDF compatible with all readers and can be further processed with other PDF tools. Adjustable opacity lets you balance visibility with readability of the underlying content.
Tips for best results
- Short text beats long phrasesLong phrases may overlap page content or become hard to read at smaller sizes.
- Diagonal with 15–25% opacityThis is the best balance between visibility and readability.
- Test a single page firstConfirm your settings before committing to the full document.
- Stay consistent within a batchFor legal or compliance purposes, use the same text and appearance.
- Keep an unwatermarked originalWatermarks are embedded in the file content and cannot be easily removed by recipients.
Why Tosea.ai
Acrobat watermarking
Requires a paid subscription.
Other online tools
Forced branding and file size limits.
Tosea.ai watermarking
Local processing, real-time preview, no restrictions.
Your documents — often confidential or sensitive by the very nature of needing a watermark — are never uploaded to any server. The real-time preview lets you dial in exactly the right look before applying, saving time on trial-and-error.
Related tools
FAQ
Add Watermark to PDF FAQ
These answers explain what the tool does, what files it supports, and where the current limits are.
Can I add an image watermark?
The current version supports text watermarks only. Image watermark support may be added later.
Will this modify my original file?
No. The tool creates a new PDF with the watermark applied. Your original file is unchanged.
Can I remove the watermark later?
Watermarks are embedded in the PDF content. They cannot be easily removed after saving.
Can I apply different watermarks to different pages?
The current tool applies the same watermark uniformly across all pages. For page-specific watermarks, split your PDF first, apply different watermarks to each section, then merge them back together.
Does it support non-Latin characters in watermark text?
Yes. The watermark tool supports Unicode text including Chinese, Japanese, Korean, Arabic, and other scripts. Enter your text in any language and it will be rendered correctly across all pages.