Fixbox

Add Watermark to PDF Online

Perform powerful edits client-side. Your documents are modified fully inside your browser sandboxed threads.

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Tool Configurations

📄

Drag & drop your PDF documents

Or click to browse files. Multi-file uploads are supported for merging and layout organization.

Max file size: 50MB

How to Use

  1. 1.Upload your target PDF document.
  2. 2.Set your watermark text, choose color, adjust opacity, and text size in the sidebar.
  3. 3.Click 'Save & Export PDF' to download the watermarked file.

Frequently Asked Questions

Will the watermark cover my PDF content?

You can adjust the opacity slider (e.g. to 30-40%) to ensure the watermark remains readable without blocking the background text.